|
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. Geology 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 may be able to produce earthquakes approaching 6.5 – 7.3 in magnitude. References * External linksSan Cayetano Fault– Southern California Earthquake Center The Southern California Earthquake Center (SCEC) is a collaboration of more than 1,000 scientists across 100 research institutions with a mission to: conduct research on earthquakes in Southern California and elsewhere by gather ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USGS - San Cayetano Fault
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredth anniv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thrust Fault
A thrust fault is a break in the Earth's crust, across which older rocks are pushed above younger rocks. Thrust geometry and nomenclature Reverse faults A thrust fault is a type of reverse fault that has a dip of 45 degrees or less. If the angle of the fault plane is lower (often less than 15 degrees from the horizontal) and the displacement of the overlying block is large (often in the kilometer range) the fault is called an ''overthrust'' or ''overthrust fault''. Erosion can remove part of the overlying block, creating a ''fenster'' (or ''window'') – when the underlying block is exposed only in a relatively small area. When erosion removes most of the overlying block, leaving island-like remnants resting on the lower block, the remnants are called ''klippen'' (singular ''klippe''). Blind thrust faults If the fault plane terminates before it reaches the Earth's surface, it is referred to as a ''blind thrust'' fault. Because of the lack of surface evidence, blind thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ventura County, California
Ventura County () is a county in the southern part of the U.S. state of California. As of the 2020 census, the population was 843,843. The largest city is Oxnard, and the county seat is the city of Ventura. Ventura County comprises the Oxnard–Thousand Oaks–Ventura, CA Metropolitan Statistical Area, which is part of the Greater Los Angeles area (Los Angeles-Long Beach, CA Combined Statistical Area). It is also considered the southernmost county along the California Central Coast. Two of the Channel Islands are part of the county: Anacapa Island, which is the most visited island in Channel Islands National Park, and San Nicolas Island. History Pre-colonial period Ventura County was historically inhabited by the Chumash people, who also settled much of Santa Barbara and San Luis Obispo Counties, with their presence dating back 10,000–12,000 years. The Chumash were hunter-gatherers, fishermen, and also traders with the Mojave, Yokuts, and Tongva Indians. The Chum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern California
Southern California (commonly shortened to SoCal) is a geographic and Cultural area, cultural region that generally comprises the southern portion of the U.S. state of California. It includes the Los Angeles metropolitan area, the second most populous urban agglomeration in the United States. The region generally contains ten of California's 58 counties: Imperial County, California, Imperial, Kern County, California, Kern, Los Angeles County, California, Los Angeles, Orange County, California, Orange, Riverside County, California, Riverside, San Bernardino County, California, San Bernardino, San Diego County, California, San Diego, Santa Barbara County, California, Santa Barbara, San Luis Obispo County, California, San Luis Obispo and Ventura County, California, Ventura counties. The Colorado Desert and the Colorado River are located on Southern California's eastern border with Arizona, and San Bernardino County shares a border with Nevada to the northeast. Southern California's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ventura, California
Ventura, officially named San Buenaventura (Spanish for "Saint Bonaventure"), is a city on the Southern Coast of California and the county seat of Ventura County. The population was 110,763 at the 2020 census. Ventura is a popular tourist destination, owing to its historic landmarks, beaches, and resorts. Ventura was founded by the Spanish in 1782, when Saint Junípero Serra established Mission San Buenaventura. Following the Mexican secularization of the Californian missions, San Buenaventura was granted by Governor Pío Pico to Don José de Arnaz as Rancho Ex-Mission San Buenaventura and a small community arose. Following the American Conquest of California, San Buenaventura eventually incorporated as a city in 1866. The 1920s brought a major oil boom, which along with the post–World War II economic expansion, significantly developed and expanded Ventura. History Archaeological discoveries in the area suggest that humans have populated the region for at least 10,000 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Topatopa Mountains
The Topatopa Mountains are a mountain range in Ventura County, California, north of Ojai, Santa Paula, and Fillmore. They are part of the Transverse Ranges of Southern California. Etymology A name for the mountains was first inscribed within the archives of Mission Basilica San Buenaventura in 1943, citing a nearby Chumash ranchería named "Si-toptopo". In 1945, American linguist and ethnologist John Peabody Harrington noted that "topa" is a Chumash word meaning "reed" or " rush". Geography The Topatopa Mountains lie in an east–west direction east of the Sierra Madre Mountains, and west of the Sierra Pelona Mountains. To the south lies the Santa Clara River Valley into which various creeks drain starting in the mountains into the Santa Clara River. The range reaches an elevation of at Hines Peak, about six miles north of Thomas Aquinas College. Snow frequently falls on the high peaks during winter. Hydrology Several major tributaries of the Santa Clara River flow down fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piru, California
Piru () is a small unincorporated historic town located in eastern Ventura County, California, in the Santa Clara River Valley near the Santa Clara River and Highway 126, about seven miles (11 km) east of Fillmore and about west of Interstate 5. Lake Piru, in the Los Padres National Forest, is the main recreational attraction. The population was 2,063 at the 2010 census, up from 1,196 when the 2000 census was enumerated. For statistical purposes, the United States Census Bureau has defined Piru as a census-designated place (CDP), which does not precisely correspond to the historical community. Etymology Although the town is located in the traditional homelands of the Tataviam, the name ''Piru'' (originally pronounced "Pea-roo") derives from the Chumash word ''pí idhu-ku,'' which referred to the tule reeds growing along Piru Creek that were used in making baskets. The traditional name is still in use by local residents. Also designated and delineated as "Piro", adja ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fillmore, California
Fillmore is a small city in Ventura County, California, United States, in the Santa Clara River Valley. In an agricultural area with rich, fertile soil, Fillmore has a historic downtown that was established when the Southern Pacific built the railroad through the valley in 1887. The rail line also provided a name for the town: J. A. Fillmore was a general superintendent for the company's Pacific system. The population was 16,419 at the 2020 census, up 9.4% from 15,002 during the 2010 census. History In 1769, the Spanish Portola expedition, first Europeans to see inland areas of California, came down the valley from the previous night's encampment near today's Rancho Camulos and camped in the vicinity of Fillmore on August 11. Fray Juan Crespi, a Franciscan missionary travelling with the expedition, had previously named the valley ''Cañada de Santa Clara''. He noted that the party travelled about 9–10 miles and camped near a large native village. Founded in 1887 upon the ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Paula, California
Santa Paula (Spanish for " St. Paula") is a city in Ventura County, California, United States. Situated amid the orchards of the Santa Clara River Valley, the city advertises itself to tourists as the "Citrus Capital of the World". Santa Paula was one of the early centers of California's petroleum industry. The Union Oil Company Building, the founding headquarters of the Union Oil Company of California in 1890, now houses the California Oil Museum. The population was 30,657 at the 2020 census, up from 29,321 at the 2010 census. History The area of what today is Santa Paula was inhabited by the Chumash, a Native American people, before the Spanish arrived. In 1769, the Spanish Portola expedition, first Europeans to see inland areas of California, came down the Santa Clara River Valley from the previous night's encampment near Fillmore and camped in the vicinity of Santa Paula on August 12, near one of the creeks coming into the valley from the north (most likely Santa Pau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ojai, California
Ojai ( ; Chumash: ''’Awhaỳ'') is a city in Ventura County, California. Located in the Ojai Valley, it is northwest of Los Angeles and east of Santa Barbara. The valley is part of the east–west trending Western Transverse Ranges and is about long by wide and divided into a lower and an upper valley, each of similar size, surrounded by hills and mountains. The population was 7,637 at the 2020 census, up from 7,461 at the 2010 census. Ojai is a tourism destination known for its boutique hotels, recreation opportunities, hiking, and farmers' market of local organic agriculture. It has small businesses specializing in local and ecologically friendly art, design, and home improvement. Chain stores are prohibited by city ordinance to encourage local small business development and keep the town unique. The name Ojai is derived from the Mexican-era Rancho Ojai, which in turn took its name from the Ventureño Chumash word Awha'y'', meaning "Moon".Tumamait-Stenslie, Julie. " ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Rupture
In seismology, surface rupture (or ground rupture, or ground displacement) is the visible offset of the ground surface when an earthquake rupture along a fault affects the Earth's surface. Surface rupture is opposed by buried rupture, where there is no displacement at ground level. This is a major risk to any structure that is built across a fault zone that may be active, in addition to any risk from ground shaking. Surface rupture entails vertical or horizontal movement, on either side of a ruptured fault. Surface rupture can affect large areas of land. __TOC__ Lack of surface rupture Not every earthquake results in surface rupture, particularly for smaller and deeper earthquakes. In some cases, however, the lack of surface effects is because the fault that moved does not reach the surface. For example, the 1994 Northridge earthquake had a moment magnitude of 6.7, caused major damage in the Los Angeles area, occurred at below the Earth's surface, but did not cause surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1812 Ventura Earthquake
The 1812 Ventura earthquake (also known as the Santa Barbara earthquake) occurred on the morning of December 21 at 11:00 Pacific Standard Time (PST). The 7.1–7.5 magnitude earthquake, with a Modified Mercalli intensity scale rating of X (''Extreme''), along with its resulting tsunami, caused considerable damage to present-day Santa Barbara and Ventura County, California, which was at the time a territory of the Spanish Empire. One person was killed as a result of the earthquake while another from the aftershock. The earthquake occurred just as the region was recovering from another event on the 8th of December the same year. Both events are thought to have been related. Geological setting ''see also: Thrust tectonics and Transverse Range'' The San Andreas is the "master fault" of California, it is the main plate boundary in the San Andreas Fault System, consisting of other major active faults. This zone of interaction between the Pacific and North American Plates have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_(cropped).jpg "Click for more on -> Ventura, California")
