"State Beach and Rivermouth Beach. The Santa Clara River separates Oxnard and Ventura. Tributaries to this river include Sespe Creek, Piru Creek, and Castaic Creek. Oxnard is on a tectonically active plate, since most of Coastal California is near the boundaries between the Pacific and North American Plates. The San Andreas Fault, which demarcates this boundary, is about 40 miles away. One active fault that transverses Oxnard is the Oak Ridge Fault, which straddles the Santa Clara River Valley westward from the Santa Susana Mountains, crosses the Oxnard Plain through Oxnard, and extends into the Santa Barbara Channel. The fault"
"interval of roughly 140–160 years. Northwest of Frazier Park, the fault runs through the Carrizo Plain, a long, treeless plain where much of the fault is plainly visible. The Elkhorn Scarp defines the fault trace along much of its length within the plain. The southern segment, which stretches from Parkfield in Monterey County all the way to the Salton Sea, is capable of an 8.1-magnitude earthquake. At its closest, this fault passes about to the northeast of Los Angeles. Such a large earthquake on this southern segment would kill thousands of people in Los Angeles, San Bernardino, Riverside, and surrounding"
"a rupture along both faults could produce a quake with a magnitude of as much as 7.0, though such an event would likely happen only once every 3,000 to 5,000 years. Hollywood fault The Hollywood fault is an active fault of approximately in length located along the northern edge of the Los Angeles basin. It is part of a system of seismically active folds and faults that constitute the complex transition zone between the Transverse and Peninsular Ranges. The Malibu Coast—Santa Monica—Hollywood fault system is the result of transtension and transpression associated with rotation of the Transverse Ranges in the"
"a system of coastal faults which run roughly parallel to the San Andreas. The movement of the San Gregorio is right-lateral strike-slip, and the slip rate is estimated to be 4 to 10 mm/year (0.2 to 0.4 inch/year). The most recent major earthquake along the fault occurred some time between 1270-1775 AD, with an estimated magnitude of 7 to 7.25. San Gregorio Fault The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. The southern end of the fault is in southern Monterey Bay, and the northern end is about"
"San Andreas Fault The San Andreas Fault is a continental transform fault that extends roughly through California. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). The fault divides into three segments, each with different characteristics and a different degree of earthquake risk. The slip rate along the fault ranges from /yr. The fault was identified in 1895 by Professor Andrew Lawson of UC Berkeley, who discovered the northern zone. It is often described as having been named after San Andreas Lake, a small body of water that"
"Laguna Salada Fault The Laguna Salada Fault is a geological fault between the United States and Mexico. About long, it straddles the Imperial County-California–Baja California border. According to some seismologists the 1892 Laguna Salada earthquake ranks among the largest earthquakes in California and Baja California in historic times. It occurred on 23 February 1892, and was centered near Laguna Salada in Baja California. The Laguna Salada Fault is thought to be the origin of the 2010 Baja California earthquake. Prior to this, the fault had not produced a major earthquake for over 100 years, since 1892. The Laguna Salada Fault"
"San Gregorio Fault The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. The southern end of the fault is in southern Monterey Bay, and the northern end is about 20 km northwest of San Francisco, near Bolinas Bay, where the San Gregorio intersects the San Andreas Fault. Most of the San Gregorio fault trace is located offshore beneath the waters of Monterey Bay, Half Moon Bay, and the Pacific Ocean, though it cuts across land near Point Año Nuevo and Pillar Point. The San Gregorio Fault is part of"
"is unusual in comparison to all other faults in Northern California due to its nearly east-west alignment. Battle Creek Fault Zone The Battle Creek Fault Zone is a system of closely parallel faults that run between the Coast Ranges near the town of Cottonwood to the west, extending northeast about 22 miles toward the southern slopes of Mt. Lassen. The faulting action is normal (vertical motion) with terrain to the south lower than terrain to the north. Although there have been no earthquakes in historic times, it is believed that the fault zone may still be active, and has been"
"Hayward Fault Zone The Hayward Fault Zone is a geologic fault zone capable of generating destructive earthquakes. This fault is about long, situated mainly along the western base of the hills on the east side of San Francisco Bay. It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. The Hayward Fault is parallel to the San Andreas Fault, which lies offshore and through the San Francisco Peninsula. To the east of the Hayward lies the Calaveras Fault. In 2007 the Hayward Fault was discovered to merge"
"Hollywood fault The Hollywood fault is an active fault of approximately in length located along the northern edge of the Los Angeles basin. It is part of a system of seismically active folds and faults that constitute the complex transition zone between the Transverse and Peninsular Ranges. The Malibu Coast—Santa Monica—Hollywood fault system is the result of transtension and transpression associated with rotation of the Transverse Ranges in the Cenozoic Era. It has an established dip angle of between 70° and 90° based on surface and subsurface observations, and has experienced significant left-slip movement since the late Miocene. Its minimum"
"Rose Canyon Fault The Rose Canyon Fault is a right-lateral strike-slip fault running in a north-south direction through San Diego County, California. The Rose Canyon Fault is about in length. It starts in the Mission Valley area and heads past Mt. Soledad and La Jolla into the Pacific Ocean where it joins other faults such as the Oceanside Fault. Not much is known about the Rose Canyon fault, though its slip-rate is thought to be 1.1 mm/year. The Rose Canyon Fault has sustained at least one late Holocene rupture, with the date of the earthquake estimated to be after AD"
"zones have remained about the same"". The Shoreline Fault is a 25 km long vertical strike-slip fault, identified in 2008, which lies approximately three hundred meters from the Diablo Canyon Nuclear Power Plant in California. According to Pacific Gas & Electric, the fault may produce quakes up to 6.5 magnitude. Mandated three-dimensional seismic studies have not been yet completed, and are not prerequisites for reissuance of the operating licenses for the two onsite units. The company asserts the facility is able to withstand a 7.5 magnitude quake, and NRC's estimate of the risk each year of an earthquake intense enough"
"Garlock Fault The Garlock Fault is a left-lateral strike-slip fault running northeast-southwest along the north margins of the Mojave Desert of Southern California, for much of its length along the southern base of the Tehachapi Mountains. The Garlock Fault marks the northern boundary of the area known as the Mojave Block, as well as the southern ends of the Sierra Nevada and the valleys of the westernmost Basin and Range province. Stretching for , it is the second-longest fault in California and one of the most prominent geological features in the southern part of the state. The Garlock Fault runs"
"Elsinore Fault Zone The Elsinore Fault Zone is a large right-lateral strike-slip geological fault structure in Southern California. The fault is part of the trilateral split of the San Andreas fault system and is one of the largest, though quietest faults in Southern California. The Elsinore fault zone, not including Whittier, Chino, and Laguna Salada faults, is long with a slip-rate of 4.0 millimeters/year (0.15 in/yr). It is estimated that this zone is capable of producing a quake of 6.5–7.5 M. The projected interval between major rupture events is 250 years. The last major rupture event on the main Elsinore"
"Ventura Fault Ventura Fault also Ventura-Pitas Point Fault is an offshore and onshore Fault system of Southern California, beginning around Santa Barbara coming onshore in Ventura with an eastward heading, its extension is unknown but presumed to head for San Bernardino. It is among a network of faults in the area, potentially connecting to San Cayetano Fault, Lion Fault, and Red Mountain Fault (the latter offshore). California Geological Survey researchers have reported that the fault is capable of an 8.0 earthquake, along with tsunami affecting Santa Barbara, Ventura, and Santa Monica. A big earthquake on the fault estimated to occur"
"better understand fault behavior . The northern segment of the fault runs from Hollister, through the Santa Cruz Mountains, epicenter of the 1989 Loma Prieta earthquake, then up the San Francisco Peninsula, where it was first identified by Professor Lawson in 1895, then offshore at Daly City near Mussel Rock. This is the approximate location of the epicenter of the 1906 San Francisco earthquake. The fault returns onshore at Bolinas Lagoon just north of Stinson Beach in Marin County. It returns underwater through the linear trough of Tomales Bay which separates the Point Reyes Peninsula from the mainland, runs just"
"Prieto Fault some 45 km to the northwest across the international border about 7 km into southern California. Cerro Prieto Fault The Cerro Prieto Fault is a transform fault located in far northern Baja California. It runs between the Cerro Prieto spreading center located southwest of Mexicali, and the Wagner Basin, another spreading center which lies under the Gulf of California. These spreading centers are part of the East Pacific Rise, the northern leg of which has formed the Gulf of California by steadily rifting the Baja California Peninsula away from the mainland of Mexico. Seismic studies indicate a linear"
"Puente Hills Fault The Puente Hills Fault (also known as the Puente Hills thrust system) is an active geological fault that is located in the Los Angeles Basin in California. The thrust fault was discovered in 1999 and runs about in three discrete sections from the Puente Hills region in the southeast to just south of Griffith Park in the northwest. The fault is known as a blind thrust fault due to a lack of surface features normally associated with thrust faults. Large earthquakes on the fault are relatively infrequent but computer modeling has indicated that a major event could"
"Guaymas Fault The Guaymas Fault, named for the city of Guaymas, Sonora, Mexico, is a major right lateral-moving transform fault which runs along the seabed of the Gulf of California. It is an integral part of the Gulf of California Rift Zone, the northern extremity of the East Pacific Rise. The Guaymas Fault runs from the San Pedro Martir Basin located at the southern end of the San Lorenzo Fault (the next transform to the north), and extends southward to the Guaymas Basin, a heavily sedimented rift which includes both continental and oceanic crust and contains numerous hydrothermal vents. The"
"long depression town of population 192. This composition of California gives it unique topography, inclusive of the highest and lowest points of the United States, Mount Whitney and Death Valley. The San Andreas Fault is a transform boundary, which lies between the North American Plate and the Pacific Plate and extends 1200 km. A transform boundary in the lithosphere means that two plates create a ‘fracture zone’ and rub against one another, causing stress and resulting in an earthquake. California is located above the San Andreas Fault, and causes the majority of Californian Earthquakes, inclusive of the Olancha Earthquake Series"
"of the fault line’s capability of supporting Isabella Dams, Treaser (1948) recorded in-depth analysis of the fault’s basement rocks. His method of understanding the geology of the fault included surface study, drilling and trenching; by this standard, he was able to discern the rocks that inhabit this fault line at 800 feet in diameter (244m). These specimens include quartzite, olivine, gabbro, sheared granitic rocks, metasedimentary rocks, and diorite. Kern Canyon Fault The Kern Canyon Fault (Late-Quaternary Active Kern Canyon Fault) is a dextral strike-slip fault (horizontal) that runs roughly around 150 km (93 mi) beside the Kern Canyon River through"
"Guaymas Fault is often grouped together with the three transform faults to its north as the Guaymas Transform Fault System. These faults are, from north to south, the Ballenas, Partida, San Lorenzo, and Guaymas. This system of fault extends some 325 km, linking the Delfin Basin in the north with the Guaymas Basin in the south. Guaymas Fault The Guaymas Fault, named for the city of Guaymas, Sonora, Mexico, is a major right lateral-moving transform fault which runs along the seabed of the Gulf of California. It is an integral part of the Gulf of California Rift Zone, the northern"
"every 400 to 2,400 years, the last being about 800 years ago. Pitas Point and Punta Gorda areas were ""yanked out of the surf zone by large uplift events,"" growing between 16 feet to 26 feet suddenly. Ventura Fault Ventura Fault also Ventura-Pitas Point Fault is an offshore and onshore Fault system of Southern California, beginning around Santa Barbara coming onshore in Ventura with an eastward heading, its extension is unknown but presumed to head for San Bernardino. It is among a network of faults in the area, potentially connecting to San Cayetano Fault, Lion Fault, and Red Mountain Fault"
"San Gabriel Fault The San Gabriel Fault is a geological fault in Los Angeles County, California, running about southeastward from the Ridge Basin in the Sierra Pelona-San Emigdio Mountains juncture area to the western San Gabriel Mountains that forms their southwestern face near Sunland and the northeastern San Fernando Valley, and then on the south flank to the southeastern part of the San Gabriel range. The San Gabriel Fault is a right-lateral strike-slip that was last active thousands of years ago — Late Quaternary west of intersection with the Sierra Madre Fault, and Quaternary east of that intersection, and Holocene"
"one person killed and 200 injured. Other aspects of the event included an experimental earthquake warning system that alerted seismologists several seconds before the damaging shear waves arrived, temporary changes in springs and wells, and the potential for postseismic fault creep. The San Andreas Fault System is an active plate boundary comprising right-lateral strike-slip faults that runs nearly the length of California. This network of faults trends north-northwest in the area of the West Napa Fault, where it is wide from west to east. The West Napa Fault transfers slip between a group of related faults (including the Concord Fault"
"Atacama Fault The Atacama Fault Zone (AFZ) is an extensive system of faults cutting across the Chilean Coastal Cordillera in Northern Chile between the Andean Mountain range and the Pacific Ocean. The fault system is North-South striking and runs for more than 1100 km North and up to 50 km in width through the Andean forearc region. The zone is a direct result of the ongoing subduction of the Eastward moving Nazca Plate beneath the South American Plate and is believed to have formed in the Early Jurassic during the beginnings of the Andean orogeny. The zone can be split"
"Imperial Fault Zone The Imperial Fault Zone is a system of geological faults located in Imperial County in the Southern California region, and adjacent Baja California state in Mexico. It cuts across the border between the United States and Mexico. The Imperial Fault Zone is a right lateral-moving strike slip fault, representing the northernmost transform fault associated with the East Pacific Rise. It is connected to the San Andreas Fault by the Brawley Seismic Zone. It terminates on its southern end at the Cerro Prieto spreading center. The Imperial Fault Zone is thought to accommodate slip from both the San"
"the Sichuan-Yunnan block. The Xianshuihe fault system comprises several distinct segments, with an overall length of about 350 km. The main segments are the Ganzi (or Ganzi-Yushu), the Xianshuihe, the Anninghe-Zemuhe, and the Xiaojiang faults. Movements on this fault system have been responsible for many large historical earthquakes, with more than 20 events of magnitude greater than 6.5 since 1700. Some of these earthquakes have formed linked sequences, with each event being triggered by the previous one due to stress changes. Like the San Andreas Fault in California, the Xianshuihe exhibits a behavior called Aseismic creep. The Xianshuihe fault creeps"
"fault tectonic system. Volcanic activity and earthquakes occur as a consequence to this tectonic configuration. The San Andreas Fault runs roughly parallel to the northeastern margin of Lake Cahuilla, where it moved at a rate of over the last 45,000–50,000 years. Earthquakes are documented in sediments from Lake Cahuilla, but this southern segment has not ruptured in historical time. Tectonic extension occurs at the points where the fault forms stepovers, although the extensional structures are still relatively immature. The Cahuilla Basin, also known as the Salton Sink, is part of the trough that is occupied by the Gulf of California."
"San Cayetano Fault The San Cayetano Fault is an east-west trending thrust fault in Ventura County, Southern California. It stretches for , north of the city of Ventura, near the Topatopa Mountains, Piru, Fillmore, Santa Paula, Sulphur Springs, and Ojai. The last known surface rupture was less than 5,000 years ago. Recent research indicates that the San Cayetano fault may have been the source of the December 21, 1812 earthquake. Depending on location, the fault has an estimated slip rate between . The recurrence rate between events is uncertain, but if the fault is associated with the 1812 event, it"
"strike-slip faults, most prominently the San Andreas Fault, which comprise the transform zone which separates the North American tectonic plate from the Pacific Plate. The irregular hills which occur along the fault trace are a result of deformation of the sedimentary rocks by the faulting; some of the earliest petroleum production in California tap reservoirs formed by the deformation. In July 2015, a University of California at Santa Barbara professor reported that helium-3 was leaking naturally from oil wells up to 3 km (1.8 mi) deep, along a 30 mi (48 km) stretch from Los Angeles's Westside to Newport Beach,"
"are common occurrences since the state is traversed by six major strike-slip fault systems with hundreds of related faults, many of which are ""sister faults"" of the infamous San Andreas Fault that runs nearly the full length of California at the juncture of the Pacific Plate and the North American Plate. The fault systems include the Hayward Fault Zone, Calaveras Fault, Clayton-Marsh Creek-Greenville Fault, and the San Gregorio Fault. Significant blind thrust faults (faults with near vertical motion and no surface ruptures) are associated with portions of the Santa Cruz Mountains and the northern reaches of the Diablo Range and"
"Battle Creek Fault Zone The Battle Creek Fault Zone is a system of closely parallel faults that run between the Coast Ranges near the town of Cottonwood to the west, extending northeast about 22 miles toward the southern slopes of Mt. Lassen. The faulting action is normal (vertical motion) with terrain to the south lower than terrain to the north. Although there have been no earthquakes in historic times, it is believed that the fault zone may still be active, and has been determined to be the closest active and possibly hazardous fault to the Shasta Dam. The fault zone"