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PC System Design Guide
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The PC System Design Guide (also known as the PC 97, PC 98, PC 99, or PC 2001 specification) is a series of hardware design requirements and recommendations for IBM PC compatible personal computers, compiled by Microsoft and Intel Corporation during 1997–2001. They were aimed at helping manufacturers provide hardware that made the best use of the capabilities of the Microsoft Windows operating system, and to simplify setup and use of such computers.
Every part of a standard computer and the most common kinds of peripheral devices are defined with specific requirements. Systems and devices that meet the specification should be automatically recognized and configured by the operating system.
Contents
[hide]
1 Versions
1.1 PC 97
1.2 PC 98
1.3 PC 99
1.4 PC 2001
2 Color-coding scheme for connectors and ports
3 See also
4 References
5 External links
Versions[edit]
Four versions of the PC System Design Guide were released. Within each version, a distinction was made between the requirements of a Consumer PC, an Office PC and an Entertainment PC.
Version
Date
PC 97 February 9, 1998
PC 98 December 31, 1998
PC 99 July 14, 1999
PC 2001 November 2, 2000
PC 97[edit]
Initial version.
Introduced color code for PS/2 keyboard (purple) and mouse (green) connectors
PC 98[edit]
Aimed at systems to be used with Windows 98 or Windows 2000. Required:
200 MHz Pentium processor with MMX technology (or equivalent performance)
256 KB L2 cache
32 MB RAM (recommended: 64 MB of 66 MHz DRAM)
ACPI 1.0 (including power button behavior)
Fast BIOS power-up (limited RAM test, no floppy test, minimal startup display, etc.)
BIOS Y2K compliance
PXE preboot environment
It was published as ISBN 1-57231-716-7.
PC 99[edit]
Required:
300 MHz CPU
64 MB RAM
USB
Comprehensive color-coding scheme for ports and connectors (see below)
Strongly discouraged:
Non plug-and-play hardware
ISA slots
It was published as ISBN 0-7356-0518-1.
PC 2001[edit]
Final version. First to require IO-APICs to be enabled on all desktop systems. Places a greatly increased emphasis on legacy-reduced and legacy-free systems. Some "legacy" items such as ISA expansion slots and device dependence on MS-DOS are forbidden entirely, while others are merely strongly discouraged.[1]
Color-coding scheme for connectors and ports[edit]
Perhaps the most end-user visible and lasting impact of PC 99 was that it introduced a color code for the various standard types of plugs and connectors used on PCs.[2] As many of the connectors look very similar, particularly to a novice PC user, this made it far easier for people to connect peripherals to the correct ports on a PC. This color code was gradually adopted by almost all PC and motherboard manufacturers. Some of the color codes have also been widely adopted by peripheral manufacturers.
Color
Function
Connector on PC
Mouse and keyboard
Green
PS/2 mouse / pointing device 6-pin mini-DIN female
Purple
PS/2 keyboard 6-pin mini-DIN female
Gold
Game port / MIDI 15-pin D female
General input/output
White
USB 1 low speed and full speed USB Type A receptacle
Black
USB 2.0 high speed USB Type A receptacle
Sky blue
USB 3.0 SuperSpeed USB Type A SuperSpeed receptacle
Yellow
USB 3.0 SuperSpeed Always On even if the PC is turned off USB Type A SuperSpeed receptacle
Red
High-power USB (more than 500 mA current available) USB Type A receptacle
Grey
IEEE 1394 (FireWire) 6-pin FireWire 400 or 9-pin FireWire 800
Burgundy
Parallel port 25-pin D female
Teal or turquoise
Serial port 9-pin D male
Video
Blue
Analog monitor 15-pin VGA female
White
Digital monitor DVI female
Yellow
S-Video 4-pin mini-DIN
Yellow
Composite video RCA jack
Black
Digital audio/video HDMI or DisplayPort female
Audio
Pink
Analog microphone audio input (mono or stereo) 3.5 mm TRS
Light blue
Analog line level audio input 3.5 mm TRS
Lime green
Analog line level audio output, front stereo (speakers or headphones) 3.5 mm TRS
Black
Analog line level audio output, rear stereo (surround speakers) 3.5 mm TRS
Orange
Analog line level audio output, center and subwoofer (surround speakers) 3.5 mm TRS
Silver
Analog line level audio output, side stereo (surround speakers) 3.5 mm TRS
Orange
Digital audio output (coaxial S/PDIF) RCA connector
Black
Digital audio output (optical S/PDIF) TOSLINK
See also[edit]
Legacy-free PC
Multimedia PC
Sound card
References[edit]
Jump up ^ Robert Bruce Thompson, Barbara Fritchman Thompson. "PC Hardware in a Nutshell" (3rd ed.). O'Reilly & Associates, Inc. p. 1.1 PCs Defined. ISBN 0-596-00513-X. Archived from the original on July 11, 2011. Retrieved January 4, 2011. CS1 maint: Uses authors parameter (link)
Jump up ^ PC 99 System Design Guide, Intel Corporation and Microsoft Corporation, 14 July 1999. Chapter 3: PC 99 basic requirements (PC 99 System Design Guide (Self-extracting .exe archive). Requirement 3.18.3: Systems use a color-coding scheme for connectors and ports. Accessed 2009-02-05
External links[edit]
Legacy PC Design Guides – Microsoft Download Center
PDF versions:
PC 97 System Design Guide
PC 98 System Design Guide
PC 99 System Design Guide
PC 2001 System Design Guide
[hide]
v
t
e
Audio and video interfaces and connectors
Audio only
Analog
Interface: PC System Design Guide
Connectors: TRS 3.5 mm
Interface: Balanced audio
Connectors: TRS 6.53 mm
XLR
Digital
Interface: S/PDIF
Connectors: RCA jack (coaxial)
TOSLINK (optical)
BNC
Interface: AES3 (AES/EBU)
Connectors: RCA jack
XLR
TOSLINK (optical)
BNC
Video only
Analog
Interface: VGA
Connectors: DB-15
DVI-A
Interface: Composite
Connectors: RCA jack yellow
Interface: S-Video
Connectors: Mini-DIN 4 Pin
Interface: Component
Connectors: RCA jacks × 3
Interface: Composite
S-Video, and Component
Connectors: VIVO using Mini-DIN 9 Pin
Digital and
analog
Interface: DVI
Connectors: DVI-I/DVI-D
Video and audio
Digital
Interface: HDMI
Connectors: HDMI connector
Interface: DisplayPort
Connectors: DisplayPort connector
Interface: HDBaseT
Connectors: 8P8C connector
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1980 eruption of Mount St. Helens
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1980 eruption of Mt. St. Helens
Photograph of the eruption column, May 18, 1980
Volcano
Mount St. Helens
Date
May 18, 1980; 38 years ago (1980-05-18)
Time
8:32 am PDT
Type
Plinian, Peléan
Location
Skamania County, Washington, U.S.
46°12′1″N 122°11′12″W / 46.20028°N 122.18667°W / 46.20028; -122.18667
VEI
5
Impact
Approximately 57 deaths, about $1.1 billion in property damage; caused a partial collapse of the volcano's flank, deposited ash in 11 U.S. states and five Canadian provinces
Map of eruption deposits
On May 18, 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in Skamania County, in the State of Washington. The eruption (a VEI 5 event) was the most significant volcanic eruption to occur in the contiguous 48 U.S. states since the much smaller 1915 eruption of Lassen Peak in California.[1] It has often been declared as the most disastrous volcanic eruption in U.S. history. The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a large bulge and a fracture system on the mountain's north slope.
An earthquake at 8:32:17 a.m. PDT (UTC−7) on Sunday, May 18, 1980, caused the entire weakened north face to slide away, creating the largest landslide ever recorded. This allowed the partly molten, high-pressure gas- and steam-rich rock in the volcano to suddenly explode northwards toward Spirit Lake in a hot mix of lava and pulverized older rock, overtaking the avalanching face.
An eruption column rose 80,000 feet (24 km; 15 mi) into the atmosphere and deposited ash in 11 U.S. states.[2] At the same time, snow, ice and several entire glaciers on the volcano melted, forming a series of large lahars (volcanic mudslides) that reached as far as the Columbia River, nearly 50 miles (80 km) to the southwest. Less severe outbursts continued into the next day, only to be followed by other large, but not as destructive, eruptions later that year. Thermal energy released during the eruption was equal to 26 megatons.[3]
Approximately 57 people were killed directly, including innkeeper Harry R. Truman, photographers Reid Blackburn and Robert Landsburg, and geologist David A. Johnston.[4] Hundreds of square miles were reduced to wasteland, causing over $1 billion in damage (equivalent to over $3 billion as of 2018[update]), thousands of animals were killed, and Mount St. Helens was left with a crater on its north side. At the time of the eruption, the summit of the volcano was owned by the Burlington Northern Railroad, but afterward the land passed to the United States Forest Service.[5] The area was later preserved, as it was, in the Mount St. Helens National Volcanic Monument.
Mount St. Helens from Monitor Ridge showing the cone of devastation, the huge crater open to the north, the post-eruption lava dome inside and Crater Glacier surrounding the lava dome. The small photo on the left was taken from Spirit Lake before the eruption and the small photo on the right was taken after the eruption from approximately the same place. Spirit Lake can also be seen in the larger image, as well as two other Cascade volcanoes.
Contents
1 Build-up to the eruption
2 Landslide and eruption
3 Pyroclastic flows
3.1 Initial lateral blast
3.2 Lateral blast result
3.3 Later flows
4 Ash column
5 Ash properties
5.1 Chemical composition
5.2 Index of refraction
6 Mudslides flow downstream
7 Aftermath
7.1 Direct results
7.1.1 Disputed death toll
7.2 Ash damage and removal
7.3 Cost
8 Later eruptions
8.1 1980–1991
8.2 2004–2008
9 Summary table
10 See also
11 Notes
12 References
13 Further reading
14 External links
Build-up to the eruption[edit]
Mount St. Helens remained dormant from its last period of activity in the 1840s and 1850s until March 1980.[6] Several small earthquakes, apparently beginning on March 15, indicated that magma may have begun moving below the volcano.[7] On March 20, at 3:45 p.m. Pacific Standard Time (all times will be in PST or PDT), a shallow magnitude 4.2 earthquake centered below the volcano's north flank,[7] signaled the volcano's violent return from 123 years of hibernation.[8] A gradually building earthquake swarm saturated area seismographs and started to climax at about noon on March 25, reaching peak levels in the next two days, including an earthquake registering 5.1 on the Richter scale.[9] A total of 174 shocks of magnitude 2.6 or greater were recorded during those two days.[10]
USGS photo showing a pre-avalanche eruption on April 10
Shocks of magnitude 3.2 or greater occurred at a slightly increasing rate during April and May with five earthquakes of magnitude 4 or above per day in early April, and eight per day the week before May 18.[8] Initially there was no direct sign of eruption, but small earthquake-induced avalanches of snow and ice were reported from aerial observations.
At 12:36 p.m. on March 27, phreatic eruptions (explosions of steam caused by magma suddenly heating groundwater) ejected and smashed rock from within the old summit crater, excavating a new crater 250 feet (75 m) wide[8] and sending an ash column about 7,000 feet (2.1 km) into the air.[10] By this date a 16,000-foot-long (3.0 mi; 4.9 km) eastward-trending fracture system had also developed across the summit area.[11] This was followed by more earthquake swarms and a series of steam explosions that sent ash 10,000 to 11,000 feet (3,000 to 3,400 m) above their vent.[8] Most of this ash fell between 3 and 12 miles (5 and 19 km) from its vent, but some was carried 150 miles (240 km) south to Bend, Oregon, or 285 miles (460 km) east to Spokane, Washington.[12]
Photo showing the cryptodome on April 27
A second, new crater and a blue flame were observed on March 29.[12][13] The flame was visibly emitted from both craters and was probably created by burning gases. Static electricity generated from ash clouds rolling down the volcano sent out lightning bolts that were up to 2 miles (3 km) long.[12] Ninety-three separate outbursts were reported on March 30,[12] and increasingly strong harmonic tremors were first detected on April 1, alarming geologists and prompting Governor Dixy Lee Ray to declare a state of emergency on April 3.[13] Governor Ray issued an executive order on April 30 creating a "red zone" around the volcano; anyone caught in this zone without a pass faced a $500 fine or six months in jail.[14][15] This precluded many cabin owners from visiting their property.[16]
By April 7, the combined crater was 1,700 by 1,200 feet (520 by 370 m) and 500 feet (150 m) deep.[17] A USGS team determined in the last week of April that a 1.5-mile-diameter (2.4 km) section of St. Helens' north face was displaced outward by at least 270 feet (82 m).[11] For the rest of April and early May this bulge grew by 5 to 6 feet (1.5 to 1.8 m) per day, and by mid-May it extended more than 400 feet (120 m) north.[11] As the bulge moved northward, the summit area behind it progressively sank, forming a complex, down-dropped block called a graben. Geologists announced on April 30 that sliding of the bulge area was the greatest immediate danger and that such a landslide might spark an eruption.[15][18] These changes in the volcano's shape were related to the overall deformation that increased the volume of the volcano by 0.03 cubic miles (0.13 km3) by mid-May.[19] This volume increase presumably corresponded to the volume of magma that pushed into the volcano and deformed its surface. Because the intruded magma remained below ground and was not directly visible, it was called a cryptodome, in contrast to a true lava dome exposed at the surface.
On May 7, eruptions similar to those in March and April resumed, and over the next days the bulge approached its maximum size.[20] All activity had been confined to the 350-year-old summit dome and did not involve any new magma. A total of about 10,000 earthquakes were recorded prior to the May 18 event, with most concentrated in a small zone less than 1.6 miles (2.6 km) directly below the bulge.[19] Visible eruptions ceased on May 16, reducing public interest and consequently the number of spectators in the area.[21] Mounting public pressure then forced officials to allow 50 carloads of property owners to enter the danger zone on Saturday, May 17, to gather whatever property they could carry.[21][22] Another trip was scheduled for 10 a.m. the next day,[21][22] and because that was Sunday, more than 300 loggers were not working in the area. By the time of the climactic eruption, dacite magma intruding into the volcano had forced the north flank outward nearly 500 feet (150 m) and heated the volcano's groundwater system, causing many steam-driven explosions (phreatic eruptions).
Landslide and eruption[edit]
Sequence of events on May 18.
Lakes nearest to Mount St. Helens have been partly covered with felled trees for more than thirty years. This photograph was taken in 2012.
North Fork Toutle River valley filled with landslide deposits
As May 18 dawned, Mount St. Helens' activity did not show any change from the pattern of the preceding month. The rate of bulge movement, sulfur dioxide emission, and ground temperature readings did not reveal any changes indicating a catastrophic eruption. USGS volcanologist David A. Johnston was on duty at an observation post approximately 6 miles (10 km) north of the volcano: as of 6 a.m., Johnston's measurements did not indicate any unusual activity.[5]
Suddenly, at 8:32 a.m., a magnitude 5.1 earthquake centered directly below the north slope triggered that part of the volcano to slide,[23] approximately 7–20 seconds after the shock.[5] The landslide, the largest in recorded history, travelled at 110 to 155 miles per hour (177 to 249 km/h) and moved across Spirit Lake's west arm. Part of it hit a 1,150-foot-high (350 m) ridge about 6 miles (10 km) north.[5] Some of the slide spilled over the ridge, but most of it moved 13 miles (21 km) down the North Fork Toutle River, filling its valley up to 600 feet (180 m) deep with avalanche debris.[23] An area of about 24 square miles (62 km2) was covered, and the total volume of the deposit was about 0.7 cubic miles (2.9 km3).[5]
Scientists were able to reconstruct the motion of the landslide from a series of rapid photographs by Gary Rosenquist, who was camping 11 miles (18 km) away from the blast.[5] Rosenquist, his party and his photographs survived because the blast was deflected by local topography 1 mile (1.6 km) short of his location.[24]
Sound of the eruption of Mount St. Helens, as heard from 140 miles away
Amateur recording of a series of booms produced by the eruption, as heard from the town of Newport, Oregon (audio filtered and amplified).
Problems playing this file? See media help.
Most of St. Helens' former north side became a rubble deposit 17 miles (27 km) long, averaging 150 feet (46 m) thick; the slide was thickest at 1 mile (1.6 km) below Spirit Lake and thinnest at its western margin.[5] The landslide temporarily displaced the waters of Spirit lake to the ridge north of the lake, in a giant wave approximately 600 feet (180 m) high.[25] This in turn created a 295 feet (90 m) avalanche of debris consisting of the returning waters and thousands of uprooted trees and stumps. Some of these remained intact with roots, but most had been sheared off at the stump seconds earlier by the blast of super-heated volcanic gas and ash that had immediately followed and overtook the initial landslide. The debris was transported along with the water as it returned to its basin, raising the surface level of Spirit Lake by about 200 feet.[5] More than three decades after the eruption, floating log mats persist on Spirit Lake and nearby St. Helens Lake, changing position with the wind. The rest of the trees, especially those that were not completely detached from their roots, were turned upright by their own weight and became waterlogged, sinking into the muddy sediments at the bottom where they have become petrified in the anaerobic and mineral-rich waters. This provides insight into other sites with a similar fossil record.[26]
Pyroclastic flows[edit]
Initial lateral blast[edit]
Computer graphic showing the May 18 landslide (green) being overtaken by the initial pyroclastic flow (red)
The landslide exposed the dacite magma in St. Helens' neck to much lower pressure, causing the gas-charged, partially molten rock and high-pressure steam above it to explode a few seconds after the landslide started. Explosions burst through the trailing part of the landslide, blasting rock debris northward. The resulting blast laterally directed the pyroclastic flow of very hot volcanic gases, ash and pumice formed from new lava, while the pulverized old rock hugged the ground, initially moving at 220 miles per hour (350 km/h) but quickly accelerating to 670 mph (1,080 km/h), and it might have briefly passed the speed of sound.[5][23]
Pyroclastic flow material passed over the moving avalanche and spread outward, devastating a fan-shaped area 23 miles across by 19 miles long (37 km × 31 km).[23] In total about 230 square miles (600 km2) of forest was knocked down,[23] and extreme heat killed trees miles beyond the blow-down zone. At its vent the lateral blast probably did not last longer than about 30 seconds, but the northward-radiating and expanding blast cloud continued for about another minute.
Superheated flow material flashed water in Spirit Lake and North Fork Toutle River to steam, creating a larger, secondary explosion that was heard as far away as British Columbia,[27] Montana, Idaho, and Northern California. Yet many areas closer to the eruption (Portland, Oregon, for example) did not hear the blast. This so-called "quiet zone" extended radially a few tens of miles from the volcano and was created by the complex response of the eruption's sound waves to differences in temperature and air motion of the atmospheric layers and, to a lesser extent, local topography.[5]
Later studies indicated that one-third of the 0.045 cubic miles (0.19 km3) of material in the flow was new lava, and the rest was fragmented, older rock.[27]
Lateral blast result[edit]
Photographer Reid Blackburn's car after the eruption
Many trees in the Direct blast zone were snapped off at their bases and the earth was stripped and scorched.
The huge ensuing ash cloud sent skyward from St. Helens' northern foot was visible throughout the quiet zone. The near-supersonic lateral blast, loaded with volcanic debris, caused devastation as far as 19 miles (31 km) from the volcano. The area affected by the blast can be subdivided into three roughly concentric zones:[5]
Direct blast zone, the innermost zone, averaged about 8 miles (13 km) in radius, an area in which virtually everything, natural or artificial, was obliterated or carried away.[5] For this reason, this zone also has been called the "tree-removal zone". The flow of the material carried by the blast was not deflected by topographic features in this zone. The blast released energy equal to 24 Megatons of TNT.
Channelized blast zone, an intermediate zone, extended out to distances as far as 19 miles (31 km) from the volcano, an area in which the flow flattened everything in its path and was channeled to some extent by topography.[5] In this zone, the force and direction of the blast are strikingly demonstrated by the parallel alignment of toppled large trees, broken off at the base of the trunk as if they were blades of grass mown by a scythe. This zone was also known as the "tree-down zone". Channeling and deflection of the blast caused strikingly varied local effects that still remained conspicuous after some decades. Where the blast struck open land directly, it scoured it, breaking trees off short and stripping vegetation and even topsoil, thereby delaying revegetation for many years. Where the blast was deflected so as to pass overhead by several metres, it left the topsoil and the seeds it contained, permitting faster revegetation with scrub and herbaceous plants, and later with saplings. Trees in the path of such higher-level blasts were broken off wholesale at various heights, whereas nearby stands in more sheltered positions recovered comparatively rapidly without conspicuous long-term harm.
Seared zone, also called the "standing dead" zone, the outermost fringe of the impacted area, a zone in which trees remained standing but were singed brown by the hot gases of the blast.[5]
Volcanologist David A. Johnston (photographed on April 4, 1980) was one of the 57 people killed in the eruption.
By the time this pyroclastic flow hit its first human victims, it was still as hot as 360 °C (680 °F) and filled with suffocating gas and flying debris.[27] Most of the 57 people known to have died in that day's eruption succumbed to asphyxiation while several died from burns.[5] Lodge owner Harry R. Truman was buried under hundreds of feet of avalanche material. Volcanologist David A. Johnston was one of those killed, as was Reid Blackburn, a National Geographic photographer. Robert Landsburg, another photographer, was killed by the ash cloud. He was able to protect his film with his body, and the surviving photos provided geologists with valuable documentation of the historic eruption.[28]
Later flows[edit]
Subsequent outpourings of pyroclastic material from the breach left by the landslide consisted mainly of new magmatic debris rather than fragments of preexisting volcanic rocks. The resulting deposits formed a fan-like pattern of overlapping sheets, tongues and lobes. At least 17 separate pyroclastic flows occurred during the May 18 eruption, and their aggregate volume was about 0.05 cubic miles (0.21 km3).[5]
The flow deposits were still at about 300 to 420 °C (570 to 790 °F) two weeks after they erupted.[5] Secondary steam-blast eruptions fed by this heat created pits on the northern margin of the pyroclastic-flow deposits, at the south shore of Spirit Lake, and along the upper part of the North Fork Toutle River. These steam-blast explosions continued sporadically for weeks or months after the emplacement of pyroclastic flows, and at least one occurred a year later, on May 16, 1981.[5]
Ash column[edit]
The ash cloud produced by the eruption, as seen from the village of Toledo, Washington, 35 miles (56 km) away, northwest from Mount St. Helens. The cloud was roughly 40 miles (64 km) wide and 15 miles (24 km) high.
Ash cloud from Mt. St. Helens as captured by the GOES 3 weather satellite at 15:45 UTC
As the avalanche and initial pyroclastic flow were still advancing, a huge ash column grew to a height of 12 miles (19 km) above the expanding crater in less than 10 minutes and spread tephra into the stratosphere for 10 straight hours.[27] Near the volcano, the swirling ash particles in the atmosphere generated lightning, which in turn started many forest fires. During this time, parts of the mushroom-shaped ash-cloud column collapsed, and fell back upon the earth. This fallout, mixed with magma, mud, and steam, sent additional pyroclastic flows speeding down St. Helens' flanks. Later, slower flows came directly from the new north-facing crater and consisted of glowing pumice bombs and very hot pumiceous ash. Some of these hot flows covered ice or water which flashed to steam, creating craters up to 65 feet (20 m) in diameter and sending ash as much as 6,500 feet (2,000 m) into the air.[29]
Strong high-altitude wind carried much of this material east-northeasterly from the volcano at an average speed of about 60 miles per hour (100 km/h). By 9:45 a.m. it had reached Yakima, Washington, 90 miles (140 km) away, and by 11:45 a.m. it was over Spokane, Washington.[5] A total of 4 to 5 inches (100 to 130 mm) of ash fell on Yakima, and areas as far east as Spokane were plunged into darkness by noon where visibility was reduced to 10 feet (3.0 m) and 0.5 inches (13 mm) of ash fell.[27] Continuing eastward, St. Helens' ash fell in the western part of Yellowstone National Park by 10:15 p.m. and was seen on the ground in Denver, Colorado, the next day.[27] In time, ash fall from this eruption was reported as far away as Minnesota and Oklahoma, and some of the ash drifted around the globe within about 2 weeks.
During the nine hours of vigorous eruptive activity, about 540,000,000 tons (540×10^6 short tons or 490×10^6 t) of ash fell over an area of more than 22,000 square miles (57,000 km2).[5] The total volume of the ash before its compaction by rainfall was about 0.3 cubic miles (1.3 km3).[5] The volume of the uncompacted ash is equivalent to about 0.05 cubic miles (0.21 km3) of solid rock, or about 7% of the amount of material that slid off in the debris avalanche.[5] By around 5:30 p.m. on May 18, the vertical ash column declined in stature, but less severe outbursts continued through the next several days.[30]
Ash properties[edit]
Residual lateral blast effects in the channelized blast zone, some thirty years after the eruption. Damage ranged from scorched earth, through tree trunks snapped at various heights, to more superficial effects.
Generally, given that the way airborne ash is deposited after an eruption is strongly influenced by the meteorological conditions, a certain variation of the ash type will occur, as a function of distance to the volcano or time elapsed from eruption. The ash from Mount St. Helens is no exception, and hence the ash properties have large variations.[31]
Chemical composition[edit]
The bulk chemical composition of the ash has been found to be approximately 65% silicon dioxide, 18% aluminium oxide, 5% ferric oxide, 4% each calcium oxide and sodium oxide and 2% magnesium oxide. Trace chemicals were also detected, their concentrations varying as shown: 0.05–0.09% chlorine, 0.02–0.03% fluorine, and 0.09–0.3% sulfur.[31]
Index of refraction[edit]
The index of refraction, a number used in physics to describe how light propagates through a particular substance, is an important property of volcanic ash. This number is complex having both real and imaginary parts, the real part indicating how light disperses and the imaginary part indicating how light is absorbed by the substance.
It is known that the silicate particles have a real index of refraction ranging between 1.5 and 1.6 for visible light. However, there is a spectrum of colors associated with samples of volcanic ash, from very light to dark gray. This makes for variations in the measured imaginary refractive index under visible light.[32]
In the case of Mount St. Helens, the ash settled in three main layers on the ground:[31]
the bottom layer was dark gray and was found to be abundant in older rocks and crystal fragments
the middle layer consisted of a mixture of glass shards and pumice
the top layer was ash consisting of very fine particles
For example, when comparing the imaginary part of the refractive index k of stratospheric ash from 15 km and 18 km from the volcano it has been discovered that they have similar values around 700 nm (around 0.009), while they differ significantly around 300 nm. Here, the 18 km (k was found to be around 0.009) sample was much more absorbent than the 15 km sample (k was found to be around 0.002).[32]
Mudslides flow downstream[edit]
Mudline next to Muddy River from the 1980 lahars
The hot, exploding material also broke apart and melted nearly all of the mountain's glaciers along with most of the overlying snow. As in many previous St. Helens' eruptions, this created huge lahars (volcanic mudflows) and muddy floods that affected three of the four stream drainage systems on the mountain,[29] and which started to move as early as 8:50 a.m.[25] Lahars travelled as fast as 90 miles per hour (140 km/h) while still high on the volcano but progressively slowed to about 3 miles per hour (4.8 km/h) on the flatter and wider parts of rivers.[5] Mudflows from the southern and eastern flanks had the consistency of wet concrete as they raced down Muddy River, Pine Creek and Smith Creek to their confluence at the Lewis River. Bridges were taken out at the mouth of Pine Creek and the head of Swift Reservoir, which rose 2.6 feet (0.79 m)[29] by noon to accommodate the nearly 18,000,000 cubic yards (14,000,000 m3) of additional water, mud and debris.[5]
Glacier and snow melt mixed with tephra on the volcano's northeast slope to create much larger lahars. These mudflows traveled down the north and south forks of the Toutle River and joined at the confluence of the Toutle forks and the Cowlitz River near Castle Rock, Washington, at 1:00 p.m. Ninety minutes after the eruption, the first mudflow had moved 27 miles (43 km) upstream where observers at Weyerhaeuser's Camp Baker saw a 12-foot-high (4 m) wall of muddy water and debris pass.[25] Near the confluence of the Toutle's north and south forks at Silver Lake, a record flood stage of 23.5 feet (7.2 m) was recorded.[25]
A large but slower-moving mudflow with a mortar-like consistency was mobilized in early afternoon at the head of the Toutle River north fork. By 2:30 p.m. the massive mudflow had destroyed Camp Baker,[25] and in the following hours seven bridges were carried away. Part of the flow backed up for 2.5 miles (4.0 km) soon after entering the Cowlitz River, but most continued downstream. After traveling 17 miles (27 km) further, an estimated 3,900,000 cubic yards (3,000,000 m3) of material were injected into the Columbia River, reducing the river's depth by 25 feet (8 m) for a 4-mile (6 km) stretch.[25] The resulting 13-foot (4.0 m) river depth temporarily closed the busy channel to ocean-going freighters, costing Portland, Oregon, an estimated five million US dollars.[30] Ultimately more than 65 million cubic yards (50 million cubic metres) of sediment were dumped along the lower Cowlitz and Columbia Rivers.[5]
Aftermath[edit]
Mount St. Helens one day before the eruption, photographed from the Johnston ridge
Mount St. Helens four months after the eruption, photographed from approximately the same location as the earlier picture
Direct results[edit]
The May 18, 1980, event was the most deadly and economically destructive volcanic eruption in the history of the contiguous United States.[5] Approximately fifty-seven people were killed directly from the blast and 200 houses, 47 bridges, 15 miles (24 km) of railways and 185 miles (298 km) of highway were destroyed; two people were killed indirectly in accidents that resulted from poor visibility, and two more suffered fatal heart attacks from shoveling ash.[33] U.S. President Jimmy Carter surveyed the damage and said it looked more desolate than a moonscape.[34][35] A film crew was dropped by helicopter on Mount St. Helens on May 23 to document the destruction. However, their compasses spun in circles and they quickly became lost.[36] A second eruption occurred the next day (see below), but the crew survived and were rescued two days after that. The eruption ejected more than 1 cubic mile (4.2 km3) of material.[37] A quarter of that volume was fresh lava in the form of ash, pumice and volcanic bombs while the rest was fragmented, older rock.[37] The removal of the north side of the mountain (13% of the cone's volume) reduced Mount St. Helens' height by about 1,280 feet (390 m) and left a crater 1 to 2 miles (2 to 3 km) wide and 2,100 feet (640 m) deep with its north end open in a huge breach.[37]
More than 4,000,000,000 board feet (9,400,000 m3) of timber was damaged or destroyed, mainly by the lateral blast.[5] At least 25% of the destroyed timber was salvaged after September 1980. Downwind of the volcano, in areas of thick ash accumulation, many agricultural crops, such as wheat, apples, potatoes and alfalfa, were destroyed. As many as 1,500 elk and 5,000 deer were killed, and an estimated 12 million[5] Chinook and Coho salmon fingerlings died when their hatcheries were destroyed. Another estimated 40,000 young salmon were lost when they swam through turbine blades of hydroelectric generators after reservoir levels were lowered along the Lewis River to accommodate possible mudflows and flood waters.[5]
In total Mount St. Helens released 24 megatons of thermal energy, 7 of which were a direct result of the blast. This is equivalent to 1,600 times the size of the atomic bomb dropped on Hiroshima.[38]
Disputed death toll[edit]
There is a minor controversy in regard to the exact death toll. The figure most commonly cited is fifty-seven. However, there are two points of dispute.
The first point regards two officially listed victims, Paul Hiatt and Dale Thayer. They were reported missing after the explosion. In the aftermath, investigators were able to locate individuals named Paul Hiatt and Dale Thayer who were alive and well. However, they were unable to determine who reported Hiatt missing, and the person who was listed as reporting Thayer missing claimed she wasn't the one who had done so. Since the investigators could not thus verify that they were the same Hiatt and Thayer who were reported missing, the names remain listed among the presumed dead.[39][40]
The second point regards three missing people who are not officially listed as victims: Robert Ruffle, Steven Whitsett and Mark Melanson. Cowlitz County Emergency Services Management lists them as "Possibly Missing — Not on [the official] List". According to Melanson's brother, in October 1983, Cowlitz County officials told his family that Melanson "is believed [...] a victim of the May 18, 1980, eruption" and that after years of searching, the family eventually decided "he's buried in the ash".[40]
Taking these two points of dispute into consideration, the direct death toll could be as low as fifty-five or as high as sixty. When combined with the four indirect victims mentioned earlier, those numbers range from fifty-nine to sixty-four.
Ash damage and removal[edit]
Map of ash distribution over the United States
The ash fall created some temporary major problems with transportation, sewage disposal, and water treatment systems. Visibility was greatly decreased during the ash fall, closing many highways and roads. Interstate 90 from Seattle to Spokane was closed for a week and a half.[5] Air travel was disrupted for between a few days and two weeks, as several airports in eastern Washington shut down because of ash accumulation and poor visibility. Over a thousand commercial flights were cancelled following airport closures.[5] Fine-grained, gritty ash caused substantial problems for internal-combustion engines and other mechanical and electrical equipment. The ash contaminated oil systems and clogged air filters, and scratched moving surfaces. Fine ash caused short circuits in electrical transformers, which in turn caused power blackouts.
Removing and disposing of the ash was a monumental task for some Eastern Washington communities. State and federal agencies estimated that over 2,400,000 cubic yards (1,800,000 m3) of ash, equivalent to about 900,000 tons in weight, were removed from highways and airports in Washington.[5] The ash removal cost $2.2 million and took 10 weeks in Yakima.[5] The need to remove ash quickly from transport routes and civil works dictated the selection of some disposal sites. Some cities used old quarries and existing sanitary landfills; others created dump sites wherever expedient. To minimize wind reworking of ash dumps, the surfaces of some disposal sites were covered with topsoil and seeded with grass. In Portland, Oregon, the mayor eventually threatened businesses with fines if they failed to remove the ash from their parking lots.[41]
Cost[edit]
One of the 200 houses destroyed by the eruption
A refined estimate of $1.1 billion ($3.4 billion as of 2018[update][42]) was determined in a study by the International Trade Commission at the request of the United States Congress.[5] A supplemental appropriation of $951 million for disaster relief was voted by Congress, of which the largest share went to the Small Business Administration, U.S. Army Corps of Engineers and the Federal Emergency Management Agency.[5]
There were also indirect and intangible costs of the eruption. Unemployment in the immediate region of Mount St. Helens rose tenfold in the weeks immediately following the eruption, and then returned to near-normal levels once timber-salvaging and ash-cleanup operations were underway. Only a small percentage of residents left the region because of lost jobs owing to the eruption.[5] Several months after May 18, a few residents reported suffering stress and emotional problems, even though they had coped successfully during the crisis. Counties in the region requested funding for mental health programs to assist such people.[5]
Initial public reaction to the May 18 eruption dealt a nearly crippling blow to tourism, an important industry in Washington. Not only was tourism down in the Mount St. Helens–Gifford Pinchot National Forest area, but conventions, meetings and social gatherings also were cancelled or postponed at cities and resorts elsewhere in Washington and neighboring Oregon not affected by the eruption. The adverse effect on tourism and conventioneering, however, proved only temporary. Mount St. Helens, perhaps because of its reawakening, has regained its appeal for tourists. The United States Forest Service and the State of Washington opened visitor centers and provided access for people to view the volcano's devastation.[5]
Later eruptions[edit]
St. Helens produced an additional five explosive eruptions between May and October 1980. Through early 1990 at least 21 periods of eruptive activity had occurred. The volcano remains active, with smaller, dome-building eruptions continuing into 2008.
1980–1991[edit]
Eruption on July 22, 1980
An eruption occurred on May 25, 1980, at 2:30 a.m. that sent an ash column 9 miles (14 km) into the atmosphere.[37] The eruption was preceded by a sudden increase in earthquake activity and occurred during a rainstorm. Erratic wind from the storm carried ash from the eruption to the south and west, lightly dusting large parts of western Washington and Oregon. Pyroclastic flows exited the northern breach and covered avalanche debris, lahars and other pyroclastic flows deposited by the May 18 eruption.[37]
At 7:05 p.m. on June 12, a plume of ash billowed 2.5 miles (4.0 km) above the volcano. At 9:09 p.m. a much stronger explosion sent an ash column about 10 miles (16 km) skyward.[43] This event caused the Portland area, previously spared by wind direction, to be thinly coated with ash in the middle of the annual Rose Festival.[44] A dacite dome then oozed into existence on the crater floor, growing to a height of 200 feet (61 m) and a width of 1,200 feet (370 m) within a week.[43]
A series of large explosions on July 22 broke more than a month of relative quiet. The July eruptive episode was preceded by several days of measurable expansion of the summit area, heightened earthquake activity, and changed emission rates of sulfur dioxide and carbon dioxide. The first hit at 5:14 p.m. as an ash column shot 10 miles (16 km) and was followed by a faster blast at 6:25 p.m. that pushed the ash column above its previous maximum height in just 7.5 minutes.[43] The final explosion started at 7:01 p.m. and continued for over two hours.[43] When the relatively small amount of ash settled over eastern Washington, the dome built in June was gone.[45]
The growing third dome on October 24, 1980
Seismic activity and gas emission steadily increased in early August, and on August 7 at 4:26 p.m., an ash cloud slowly expanded 8 miles (13 km) into the sky.[45] Small pyroclastic flows came through the northern breach and a weaker outpouring of ash rose from the crater. This continued until 10:32 p.m. when a second large blast sent ash high into the air, proceeding due north.[45] A second dacite dome filled this vent a few days later.
Two months of repose were ended by an eruption lasting from October 16 to 18. This event obliterated the second dome, sent ash 10 miles (16 km) in the air and created small, red-hot pyroclastic flows.[45] A third dome began to form within 30 minutes after the final explosion on October 18, and within a few days, it was about 900 feet (270 m) wide and 130 feet (40 m) high. In spite of the dome growth next to it, a new glacier formed rapidly inside the crater.
All of the post-1980 eruptions were quiet dome-building events, beginning with the December 27, 1980, to January 3, 1981, episode. By 1987 the third dome had grown to be more than 3,000 feet (910 m) wide and 800 feet (240 m) high.[45]
Further eruptions occurred over a few months between 1989 and 1991.
Plume of volcanic ash and steam in October 2004 eruption
2004–2008[edit]
Main article: 2004–08 volcanic activity of Mount St. Helens
The 2004–08 volcanic activity of Mount St. Helens has been documented as a continuous eruption with a gradual extrusion of magma at the Mount St. Helens volcano. Starting in October 2004, there was a gradual building of a new lava dome. The new dome did not rise above the caldera created by the 1980 eruption. This activity lasted until January 2008.
Summary table[edit]
Eruption summary
May 18, 1980, eruption of Mount St. Helens
Elevation of summit:
Before eruption:
9,677 ft (2,950 m)
After eruption:
8,363 ft (2,549 m)
Total removed:
1,314 ft (401 m)
Crater dimensions:
East-West:
1.2 mi (1.9 km)
North-South:
1.8 mi (2.9 km)
Depth:
2,084 ft (635 m)
Crater floor elevation:
6,279 ft (1,914 m)
Eruption
Date:
May 18, 1980
Time of initial blast:
8:32 a.m. Pacific Daylight Time (UTC−7)
Eruption trigger:
A magnitude 5.1 earthquake about 1 mi (1.6 km) beneath the volcano
Landslide and debris avalanche
Area covered:
23 sq mi (60 km2)
Volume:
(uncompacted deposits)
0.67 cu mi (2.8 km3)
Depth of deposit:
Buried North Fork Toutle River to average depth of 150 ft (46 m) with a maximum depth of 600 ft (183 m)
Velocity:
70 to 150 mph (113 to 241 km/h)
Lateral blast
Area covered:
230 sq mi (596 km2); reached 17 mi (27 km) northwest of the crater
Volume of deposit:
(uncompacted deposits)
0.046 cu mi (0.19 km3)
Depth of deposit:
From about 3 ft (1 m) at volcano to less than 1 in (2.5 cm) at blast edge
Velocity:
At least 300 mph (480 km/h)
Temperature:
As high as 660 °F (350 °C)
Energy release:
24 megatons thermal energy (7 by blast, rest through release of heat)
Trees blown down:
4,000,000,000 board feet (9,400,000 m3) of timber (enough to build about 300,000 two-bedroom homes)
Human fatalities:
55-60 (direct); 4 (indirect); 59-64 (total)
Lahars
Velocity:
About 10 to 25 mph (16 to 40 km/h) and over 50 mph (80 km/h) on steep flanks of volcano
Damaged:
27 bridges, nearly 200 homes. Blast and lahars destroyed more than 185 mi (298 km) of highways and roads and 15 mi (24 km) of railways.
Effects on Cowlitz River:
Reduced carrying capacity at flood stage at Castle Rock from 76,000 cu ft (2,200 m3) per second to less than 15,000 cu ft (420 m3) per second.
Effects on Columbia River:
Reduced channel depth from 40 to 14 ft (12 to 4 m); stranded 31 ships in upstream ports
Eruption column and cloud
Height:
Reached about 80,000 ft (24,400 m) in less than 15 minutes
Downwind extent:
Spread across U.S. in 3 days; circled Earth in 15 days
Volume of ash:
(based on uncompacted deposits)
0.26 cu mi (1.1 km3)
Ash fall area:
Detectable amounts of ash covered 22,000 sq mi (57,000 km2)
Ash fall depth:
10 in (25 cm) at 10 mi (16 km) downwind (ash and pumice)
1 in (2.5 cm) at 60 mi (97 km) downwind
0.5 in (1.3 cm) at 300 mi (480 km) downwind
Pyroclastic flows
Area covered:
6 sq mi (16 km2); reached as far as 5 mi (8 km) north of crater
Volume and depth:
(volume based on uncompacted deposits)
0.029 cu mi (0.12 km3); multiple flows 3 to 30 ft (1 to 9 m) thick; cumulative depth of deposits reached 120 ft (37 m) in places
Velocity:
Estimated at 50 to 80 mph (80 to 130 km/h)
Temperature:
At least 1,300 °F (700 °C)
Other
Wildlife:
The Washington State Department of Game estimated nearly 7,000 big game animals (deer, elk and bear) perished as well as all birds and most small mammals. Many burrowing rodents, frogs, salamanders and crawfish managed to survive because they were below ground level or water surface when the disaster struck.
Fisheries:
The Washington Department of Fisheries estimated that 12 million Chinook and Coho salmon fingerlings were killed when hatcheries were destroyed. Another estimated 40,000 young salmon were lost when forced to swim through turbine blades of hydroelectric generators as reservoir levels along the Lewis River were kept low to accommodate possible mudflows and flooding.
Brantley and Myers, 1997, Mount St. Helens – From the 1980 Eruption to 1996: USGS Fact Sheet 070–97, accessed 2007-06-05; and Tilling, Topinka, and Swanson, 1990, Eruption of Mount St. Helens – Past, Present, and Future: USGS General Interest Publication, accessed 2007-06-05.
Table compiled by Lyn Topinka, USGS/CVO, 1997
See also[edit]
Cascade Volcanoes — High Cascades.
List of Cascade volcanoes
Geology of the Pacific Northwest
Pacific Ring of Fire
The Eruption of Mount St. Helens! (1980 film) — documentary movie about the eruption.
Notes[edit]
This article incorporates public domain material from the United States Geological Survey document: "Eruptions of Mount St. Helens: Past, Present, and Future". Retrieved December 5, 2010.
Jump up ^ Fisher, Heiken & Hullen (1998), p. 294.
Jump up ^ Harden, Blaine (May 18, 2005). "Explosive Lessons of 25 Years Ago". The Washington Post. p. A03. Retrieved February 8, 2015.
Jump up ^ "Mount Saint Helens Eruption - giph.io". giph.io. Retrieved September 25, 2017.
Jump up ^ "Those who lost their lives because of the May 18, 1980 eruption of Mount St. Helens" (PDF). KGW news. Archived from the original (PDF) on May 25, 2009.
^ Jump up to: a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al Tilling, Robert I.; Topinka, Lyn & Swanson, Donald A. (1990). "Eruptions of Mount St. Helens: Past, Present, and Future". The Climactic Eruption of May 18, 1980. U.S. Geological Survey (Special Interest Publication). Archived from the original on October 26, 2011. Retrieved December 5, 2010. (adapted public domain text).
Jump up ^ Gorney, Cynthia (March 31, 1980). "The Volcano: Full Theater, Stuck Curtain; Hall Packed for Volcano, But the Curtain Is Stuck". The Washington Post.
^ Jump up to: a b "Mount St. Helens Precursory Activity: March 15–21, 1980". USGS. 2001. Archived from the original on October 6, 2012.
^ Jump up to: a b c d Harris, Fire Mountains of the West (1988), p. 202.
Jump up ^ Ray, Dewey (March 27, 1980). "Oregon volcano may be warming up for an eruption". Christian Science Monitor. Archived from the original on June 29, 2012. Retrieved October 31, 2010.
^ Jump up to: a b "Mount St. Helens Precursory Activity: March 22–28, 1980". United States Geological Survey. 2001. Archived from the original on October 5, 2012. Retrieved June 6, 2015.
^ Jump up to: a b c Harris, Fire Mountains of the West (1988), p. 204.
^ Jump up to: a b c d Harris, Fire Mountains of the West (1988), p. 203.
^ Jump up to: a b "Mount St. Helens Precursory Activity: March 29 – April 4, 1980". United States Geological Survey. 2001. Archived from the original on October 10, 2012. Retrieved June 6, 2015.
Jump up ^ "Hazard zones created around mountain". Spokesman-Review. (Spokane, Washington). Associated Press. May 1, 1980. p. 8.
^ Jump up to: a b "Volcano bulge grows". Spokane Daily Chronicle. (Washington). UPI. May 2, 1980. p. 6.
Jump up ^ "Mount St. Helens cabin owners angry at ban". Spokane Daily Chronicle. (Washington). wire services. May 17, 1980. p. 1.
Jump up ^ "Mount St. Helens Precursory Activity: April 5–11, 1980". United States Geological Survey. 2001. Archived from the original on October 11, 2012. Retrieved June 6, 2015.
Jump up ^ "St. Helens: Huge hunk of mountain could still hit lake". Lewiston Morning Tribune. (Idaho). Associated Press. April 29, 1980. p. 3B.
^ Jump up to: a b "Reawakening and Initial Activity". United States Geological Survey. 1997. Archived from the original on June 9, 2007. Retrieved May 31, 2007.
Jump up ^ "Mount St. Helens Precursory Activity: May 3–9, 1980". USGS. 2001. Archived from the original on February 3, 2013. Retrieved May 26, 2007.
^ Jump up to: a b c "Mount St. Helens Precursory Activity: May 10–17, 1980". United States Geological Survey. 2001. Archived from the original on March 12, 2010. Retrieved June 6, 2015.
^ Jump up to: a b "Homes near volcano checked". Eugene Register-Guard. (Oregon). Associated Press. May 18, 1980. p. 6A.
^ Jump up to: a b c d e Harris, Fire Mountains of the West (1988), p. 205.
Jump up ^ Fisher, Heiken & Hullen (1998), p. 117.
^ Jump up to: a b c d e f Harris, Fire Mountains of the West (1988), p. 209.
Jump up ^ Fritz, William, J.; Harrison, Sylvia (1985). "Transported trees from the 1982 Mount St. Helens sediment flows: Their use as paleocurrent indicators". Sedimentary Geology (Scientific). Elsevier BV. 42 (1,2): 49-64.
^ Jump up to: a b c d e f Harris, Fire Mountains of the West (1988), p. 206.
Jump up ^ Robert Coenraads (2006). "Natural Disasters and How We Cope", p.50. Millennium House, ISBN 978-1-921209-11-6.
^ Jump up to: a b c Harris, Fire Mountains of the West (1988), p. 208.
^ Jump up to: a b Harris, Fire Mountains of the West (1988), p. 210.
^ Jump up to: a b c Taylor, H. E.; Lichte, F. E. (1980). "Chemical composition of Mount St. Helens volcanic ash". Geophysical Research Letters. 7 (11): 949–952. doi:10.1029/GL007i011p00949.
^ Jump up to: a b Patterson, E. M. (1981). "Measurement of the Imaginary Part of the Refractive Index Between 300 and 700 Nanometers for Mount St. Helens Ash". Science. 211 (4484): 836–838. doi:10.1126/science.211.4484.836.
Jump up ^ "What were the effects on people when Mt St Helens erupted?". Oregon State University. Retrieved November 7, 2015.
Jump up ^ Patty Murray (May 17, 2005). "25th Anniversary of the Mount St. Helens Eruption". Congressional Record – Senate. U.S. Government Printing Office. pp. S5252. Retrieved May 18, 2009.
Jump up ^ Egan, Timothy (June 26, 1988). "Trees Return to St. Helens, But Do They Make a Forest?". The New York Times. p. 1. Retrieved May 18, 2009.
Jump up ^ Michael Lienau. "To Touch a Volcano: A Filmmaker's Story of Survival". Global Net Productions. Archived from the original on May 29, 2011. Retrieved May 19, 2009.
^ Jump up to: a b c d e Harris, Fire Mountains of the West (1988), p. 211.
Jump up ^ "Mount St. Helens – From the 1980 Eruption to 2000, Fact Sheet 036-00". U.S. Geological Survey. Archived from the original on May 12, 2013. Retrieved July 6, 2009.
Jump up ^ Slape, Leslie (April 22, 2005). "Mountain Mystery: Some wonder if fewer people died in 1980 eruption". The Daily News. Longview, Washington. Retrieved December 10, 2015.
^ Jump up to: a b "Mt. St Helens Victims". The Columbian. Retrieved December 10, 2015.
Jump up ^ Painter, John Jr. The 1980s. The Oregonian, December 31, 1989.
Jump up ^ As calculated using "Inflation Calculator". Retrieved June 12, 2018.
^ Jump up to: a b c d Harris, Fire Mountains of the West (1988), p. 212.
Jump up ^ "He Remembers the Year the Mountain Blew (1980)". The Oregonian. Archived from the original on August 29, 2012. Retrieved January 28, 2008.
^ Jump up to: a b c d e Harris, Fire Mountains of the West (1988), p. 213.
References[edit]
Fisher, R.V.; Heiken, G.; Hulen, J. (1998). Volcanoes: Crucibles of Change. Princeton University Press. ISBN 978-0-691-00249-1.
Harris, Stephen L. (1988). Fire Mountains of the West: The Cascade and Mono Lake Volcanoes. Missoula, MT: Mountain Press Publishing Company. ISBN 978-0-87842-220-3.
Klimasauskas, Ed (May 1, 2001). "Mount St. Helens Precursory Activity". United States Geological Survey. Archived from the original on October 6, 2012. Retrieved June 6, 2015.
Tilling, Robert I.; Topinka, Lyn & Swanson, Donald A. (1990). "Eruptions of Mount St. Helens: Past, Present, and Future". The Climactic Eruption of May 18, 1980. U.S. Geological Survey. Archived from the original on October 26, 2011. Retrieved December 5, 2010. (adapted public domain text)
Topinka, Lyn. "Mount St. Helens: A General Slide Set". Cascades Volcano Observatory, U.S. Geological Survey. Archived from the original on December 18, 2007. Retrieved May 10, 2007.
Further reading[edit]
"Eruption of Mount St. Helens". National Geographic. Vol. 159 no. 1. January 1981. pp. 3–65. ISSN 0027-9358. OCLC 643483454.
Findley, Rowe (December 1981). "Mount St. Helens Aftermath". National Geographic. Vol. 160 no. 6. pp. 713–733. ISSN 0027-9358. OCLC 643483454.
External links[edit]
Wikimedia Commons has media related to 1980 eruption of Mount St. Helens.
"Mt. St. Helens Volcano Victims". I Dream of Genealogy. Archived from the original on May 27, 2007. Retrieved December 15, 2004.
List of victims with biographical details
USGS: Mount St. Helens 1980 Debris Avalanche Deposit
USDA Forest Service: Mount St. Helens VolcanoCam
Pre-1980 Eruptive History of Mount St. Helens, Washington
USGS: Before, During, and After May 18, 1980
Video approximation of the first seconds of the May 18 eruption from Gary Rosenquist's photos on YouTube
Boston.com – The Big Picture – 30 years later
The short film Eruption of Mount St. Helens, 1980 (1981) is available for free download at the Internet Archive
The short film This place in time: The Mount St. Helens story (1984) is available for free download at the Internet Archive
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Coordinates: 46°12′01″N 122°11′12″W / 46.20028°N 122.18667°W / 46.20028; -122.18667
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text:
Love It or List It
From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Love It or List It
Genre
Reality renovations, upgrading
Created by
Maria Armstrong
Catherine Fogarty
Directed by
Various
Starring
Hilary Farr
David Visentin
Narrated by
Jacqueline Hennessy
Theme music composer
Lou Pomanti
Country of origin
Canada
United States
Original language(s)
English
No. of seasons
10
No. of episodes
130 (List of episodes)
Production
Executive producer(s)
Maria Armstrong
Catherine Fogarty
Producer(s)
Maria Armstrong
Production location(s)
Toronto, Ontario, Canada, Raleigh–Durham, North Carolina, United States
Running time
44 minutes
Production company(s)
Big Coat Productions
Release
Original network
W Network
HGTV
Original release
September 8, 2008 – present
External links
Website
Production website
Love It or List It is a Canadian home design TV show currently airing on HGTV, W Network, and on OWN Canada, and is the original show in the Love it or List It franchise. The show is produced by Big Coat Productions and was based in Toronto and other surrounding areas in Ontario, Canada. The show premiered as a primetime program on W Network on September 8, 2008, and has since aired on OWN Canada as well as HGTV in the United States. In September 2014, the show began filming in the United States in North Carolina.[1]
In September 2017, HGTV ordered 20 additional episodes of the program. The next season is to start airing in June 2018.[2]
Contents
1 Format
2 Host and crew
3 Episodes
4 Franchise
5 International syndication
6 Reception
7 Controversy
8 References
9 External links
Format[edit]
This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2016) (Learn how and when to remove this template message)
Every episode of Love It or List It follows the same formula. A couple (usually, but not in all cases) presents their living situation in the current house that they own. In most episodes, the couple is split on whether or not they want to stay in the house.
Interior designer Hilary Farr and real estate agent David Visentin tour the couple's home before meeting with them. The tour usually consists of David finding mostly negative things to say about the residence while Hilary is convinced that she can work magic with whatever plans she is given.
At the meetup between the couple and the hosts of the show, both Hilary and David are briefed as to what the couple's desires are. Hilary is given a list of renovations the couple wants for the current house and her budget for the entire project. David, meanwhile, is tasked with searching for a new home for the couple that both meets their needs and stays within their desired budget.
Common challenges faced by Hilary are an inadequate budget to complete the entire request list from the homeowners, often due to discovery of unforeseen issues with the house that are uncovered during the renovation such as lack of compliance with modern building codes. Common issues for David, meanwhile, depend on the homeowners' desires; for instance, the couple has children enrolled in the neighborhood school and they do not desire to change, or the potential house is too distant from family members or a workplace.
After Hilary's renovation is complete, the homeowners are given a tour of their current home to see what she was able to accomplish. After the tour, David meets with them and hands them an evaluation of the home's current market value following the renovations. He will then remind the couple what they could have in one of the new homes they looked at and that they would not get that in their current home.
After a moment to deliberate, Hilary and David pose a question to the homeowners. They must choose to either Love It, meaning that they will continue to live in their current home with the renovations, or to List It, meaning that they will buy one of the homes David showed them and sell their current home. After they reveal their decision, the homeowners explain their reasoning to Hilary and David (who, if they decided to Love It, reacts with incredulity) before bidding them farewell.
Host and crew[edit]
Hosts
Hilary Farr – Hilary Farr is a home designer from Toronto, Ontario. She has lived in Australia, England, California, and New York City. Farr honed her skills on properties in Los Angeles, Santa Barbara, New York and Toronto. When she first moved back to Toronto, she became the first designer to "stage" properties for sale. She continues to build and design homes in the downtown core where she herself owns properties.[3]
David Visentin – David Visentin is a real estate agent in Southern Ontario with Country Living Realty Limited. He has been practicing since 1987.[4]
Assistant Designer
Desta Ostapyk (Canadian episodes) – Desta is a Toronto-based designer who graduated in 2004 from the Toronto International Academy of Design and Technology in Interior Design, and has since focused on a career in the Television Industry. She first started working with Big Coat Productions during her last semester of school as an intern for HGTV's hit series My Parents House. She soon became the Design Stylist for the show.[5]
Contractors
Eric Eremita (North Carolina episodes) – General contractor and designer Eric Eremita was selected to be the one and only general contractor on HGTV's "Love It or List It" U.S. version, after HGTV network took notice of him when he competed in its "Brother vs. Brother" reality show.
Eddie Richardson (Canadian episodes) – Eddie Richardson was a contractor on Love It or List It who started his own family business. Richardson has also been a pro-beach volleyball player and professional bass fisherman.
Fergus McLaren (Canadian episodes) – Fergus McLaren started up his own construction company, R-Mac Solutions, 10 years ago.
Behind the Scenes
Architect: Simon West
Senior Production Coordinator: Linda Johnstone
Construction Coordinator: David Violante
Construction Assistants: Chris Blinn, Adam Dalgarno, Ahren Mrowietz, Dale George
Design Coordinator: Kaaveh Shoman
Episodes[edit]
Main article: List of Love It or List It episodes
Season
Start date
End date
Episodes
Hilary wins
David wins
1
September 8, 2008 January 5, 2009 12 9 3
2
April 6, 2009 December 7, 2009 18 10 8
3
May 3, 2010 November 8, 2010 21 9 12
4
March 14, 2011 November 11, 2011 19 12 7
5
February 20, 2012 November 19, 2012 18 10 8
6
January 19, 2013 July 1, 2013 14 8 6
7
January 8, 2014 April 9, 2014 14 11 3
8
September 8, 2014 January 19, 2015 16 8 8
9
March 9, 2015 December 7, 2015 22 13 9
Total
154
90
64
Victories for Hilary are families or clients who decided to love their home and stay. Victories for David are families and clients who decided to list and move into a new or better home.
Franchise[edit]
Main article: Love It or List It (franchise)
Love It or List It has spawned five spinoffs. The first,[6] known as Love It or List It Vancouver (or Love it or List it Too in the US), was launched in winter 2012 and is hosted by Jillian Harris and Todd Talbot. The second spin-off, a British version known as Love It or List It UK, debuted in 2015,[7] is hosted by Kirstie Allsopp and Phil Spencer. The third spin off, Love It or List It Vacation Homes[8] debuted in spring 2016 and is hosted by Dan Vickery and Elisa Goldhawke. A fourth spin off, Vendre ou renover au Quebec debuted in January 2017 and is hosted by Maika Desnoyers and Daniel Corbin.[9] The fifth spin off, Love It Or List It Australia debuted in September 2017 and is hosted by Andrew Winter and Neale Whittaker.[10]
International syndication[edit]
Country / Region
Name
Television Network
Dubbing / Subtitles
Australia Love It or List It Lifestyle Home N/A
Canada Love It or List It W Network N/A
USA Love It or List It HGTV[11] N/A
Spain Tu casa a juicio Divinity Spanish
Brazil Ame-a ou Deixe-a Discovery Home & Health Portuguese
Norway Bolighjelpen TV 2 (Norway) Norwegian
Bulgaria Podnovi ili proday Fox Life (Bulgaria) Bulgarian
Italy Prendere o lasciare Cielo dubbed in Italian
Poland Pokochaj lub sprzedaj Vancouver WP lector
|}
Reception[edit]
On August 31, 2010, Love It or List It was nominated for two Gemini Awards: Best Reality Program or Series and Best Direction in a Reality Program or Series. When HGTV premiered the show on the network, the company stated that Love It or List It has been the highest rating reality series since Candice Olson's Candice Tells All.[12]
In 2012, New York Times' columnist Gail Collins noted that it was US Secretary of State Hillary Clinton's favorite TV show.[13][14] According to Collins, Clinton finds the show "very calming"[15] after being interviewed about her departure from politics.[16][17][18]
In a 2013 interview with Las Vegas Magazine, Vanna White from Wheel of Fortune said it was one of her favourite HGTV programs.[19] Actress Julianne Moore also gave similar praise for the show in an interview with Katie Couric and the Daily Mail.[20][21]
According to the Wall Street Journal, the show and its Vancouver spinoff is one of Canada's beloved reality series.[22]
Controversy[edit]
In April 2016, homeowners Deanna Murphy and Tim Sullivan who had participated in a 2015 Love It or List It episode filed suit against production company Big Coat TV, as well as the North Carolina contractor (Aaron Fitz Construction)[23] who had been hired by the show to do the renovations on their home. The couple alleges that the renovation funds that they provided were not properly disbursed, and that the work on their home was done to a substandard quality.[24] Moreover, the lawsuit states that the television personalities on the show do not play an active role in the renovation process, and that they were not shown homes on the market by any licensed North Carolina real estate agent. Big Coat TV has commented that they "do intend to vigorously defend what [they] consider to be false allegations."[25]
The suit was settled in April 2017.[26] The plaintiffs had signed a confidentiality agreement; their lawyer would not comment on the settlement.[27] Big Coat had previously filed a countersuit for libel, slander and product disparagement; parts of that suit had been dismissed by the time of the settlement but that was under appeal by Big Coat. After the agreements had been concluded, both suits were dismissed.[28]
References[edit]
Jump up ^ http://www.bigcoatproductions.com/blog/post/love-it-or-list-it-is-on-the-move-to-the-us. Big Coat Productions. Retrieved 12 December 2014
Jump up ^ "HGTV Orders 20 New Episodes of Hit Series 'Love It or List It' | Scripps Networks Interactive Newsroom". newsroom.scrippsnetworksinteractive.com. Retrieved 2018-01-02.
Jump up ^ Host Bios; Hilary Farr "Archived copy". Archived from the original on July 18, 2011. Retrieved June 10, 2011.
Jump up ^ Host Bios; David Visentin "Archived copy". Archived from the original on July 18, 2011. Retrieved June 10, 2011.
Jump up ^ "Big Coat Productions". Big Coat Productions. Archived from the original on July 16, 2013. Retrieved March 22, 2013.
Jump up ^ Love it or List it launches new spin off
Jump up ^ "Kirstie and Phil's Love It or List It will return for a second series:Channel 4 orders six more episodes of the show to air in 2016". Digital Spy. 2 June 2015. Retrieved 14 March 2016.
Jump up ^ http://www.bigcoatmedia.com/
Jump up ^ http://www.hgtv.ca/tags/love-it-or-list-it-vacation-homes/
Jump up ^ http://www.news.com.au/entertainment/tv/reality-tv/i-fear-pineapples-are-very-much-the-new-owls-love-it-or-list-it-hosts-kiss-and-tell-on-renos/news-story/935d73b586c68943a6a455f02354bef9
Jump up ^ Vlessing, Etan (November 28, 2011). "HGTV Acquires Canadian Lifestyle Series 'Love It Or List It'". The Hollywood Reporter.
Jump up ^ W Network's Top Rated Show; http://corusent.com/home/Corporate/PressReleases/tabid/1697/Default.aspx?Id=2323
Jump up ^ Maga, Carly (March 29, 2012). "Hillary Clinton's favorite show is Canada's 'Love It Or List It'". Ca.omg.yahoo.com. Retrieved March 22, 2013.
Jump up ^ Miller, Julie. "Hillary Clinton's Unlikely Favorite TV Show Revealed". Vanity Fair. Retrieved March 22, 2013.
Jump up ^ "Vanity Fair: Hillary Clinton's Unlikely Favorite TV Show Revealed". Huffingtonpost.com. November 13, 2012. Retrieved March 22, 2013.
Jump up ^ "Hillary Clinton likes 'Love It or List It'". Politico.Com. Retrieved March 22, 2013.
Jump up ^ "Love it or list it News, Video and Gossip". Jezebel. November 11, 2012. Retrieved March 22, 2013.
Jump up ^ Collins, Gail (November 10, 2012). "Hillary's Next Move". The New York Times.
Jump up ^ "Q&A WITH VANNA WHITE". Las Vegas Magazine. September 13, 2013.
Jump up ^ Daily Mail. London http://www.dailymail.co.uk/home/you/article-2376232/Julianne-Moore-My-50s-important-years.html. Missing or empty |title= (help)
Jump up ^ "Julianne Moore Opens Up About Her Family". KatieCouric.com. Retrieved August 17, 2014.
Jump up ^ "W Network Announces Return of Home-grown Favourites in Fall 2013 Lineup". The Wall Street Journal. July 17, 2013.
Jump up ^ https://www.bizjournals.com/charlotte/bizwomen/news/latest-news/2017/05/lawsuit-against-producer-of-love-it-or-list-it.html
Jump up ^ CNN, Lisa Respers France. "'Love It or List It' homeowners file suit". CNN. Retrieved 2016-05-03.
Jump up ^ "'Love It Or List It' homeowners sue over Raleigh renovation". miamiherald. Retrieved 2016-05-03.
Jump up ^ ""Raleigh property owners settle lawsuit with 'Love It or List It'"". News & Observer. Retrieved 2017-11-26.
Jump up ^ http://www.charlotteobserver.com/news/local/article150134792.html
Jump up ^ https://www.bizjournals.com/charlotte/bizwomen/news/latest-news/2017/05/lawsuit-against-producer-of-love-it-or-list-it.html
External links[edit]
Love It or List It on HGTV
Love It or List It on W Network
Love It or List It at the Internet Movie Database
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Phil Spencer
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