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Parkfield Earthquake
Parkfield earthquake is a name given to various large earthquakes that occurred in the vicinity of the town of Parkfield, California, United States. The San Andreas fault runs through this town, and six successive magnitude 6 earthquakes occurred on the fault at unusually regular intervals, between 12 and 32 years apart (with an average of every 22 years), between 1857 and 1966. The most recent significant earthquake to occur here happened on September 28, 2004. Earthquakes may occur regularly here because the location is about midway on a fault segment between a ''locked'' segment to the south (last major earthquake 1857) and a ''creeping'' segment to the north where two tectonic plates are continuously moving without major earthquakes. Research Geologists who hoped to study what happens before a quake, and in particular any signs that might enable them to predict future earthquakes, installed an elaborate array of seismometers, creepmeters, strainmeters, and other instrume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parkfield Earthquake Activity Map
Parkfield may refer to: *Parkfield, California, an unincorporated community in California, United States **Parkfield earthquake, various earthquakes that have occurred near Parkfield **Parkfield Interventional EQ Fieldwork, land art near Parkfield *Parkfield, Cornwall, a hamlet in Cornwall, United Kingdom *Parkfield, a park and stadium serving Potters Bar Town F.C. in Potters Bar, Hertfordshire, United Kingdom *Parkfield Colliery, a former coal mine in South Gloucestershire, United Kingdom *Parkfield High School, a former secondary school in Wolverhampton, West Midlands, United Kingdom {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coalinga, California
Coalinga ( or ) is a city in Fresno County and the western San Joaquin Valley, in central California about 80 miles (128 km) southeast of Salinas. It was formerly known as ''Coaling Station A'', ''Coalingo'', and ''Coalinga Station''. The population was 13,380 as of the 2010 census, up from 11,668 at the 2000 census. It is the site of both Pleasant Valley State Prison and Coalinga State Hospital. History 19th century Legendary bandit Joaquin Murrieta was killed in 1853 at his headquarters, Arroyo de Cantua, north of Coalinga. California Historical Landmark #344 marks the approximate site of where he was slain, near the junction of present-day State Route 33 and Route 198. Before 20th-century diesel locomotives, steam locomotives were used, and powered in the San Joaquin Valley by burning coal mined from the northern foothills of Mount Diablo to the north. The Southern Pacific Railroad Company established the site as a coaling station in 1888, and it was called simply ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Earthquakes In California
The earliest known California earthquake was documented in 1769 by the Spanish explorers and Catholic missionaries of the Portolá expedition as they traveled northward from San Diego along the Santa Ana River near the present site of Los Angeles. Ship captains and other explorers also documented earthquakes. As Spanish missions in California, Spanish missions were constructed beginning in the late 18th century, earthquakes records were kept. After the missions were Secularization, secularized in 1834, records were sparse until the California Gold Rush in the 1840s. From 1850–2004, there was about one potentially damaging event per year on average, though many of these did not cause serious consequences or loss of life. Since the three damaging earthquakes that occurred in the Midwestern United States, American Midwest and the East Coast of the United States, East Coast (1755 Cape Ann earthquake, 1755 Cape Ann, 1811–1812 New Madrid earthquakes, 1811–12 New Madrid, 1886 Char ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foreshock
A foreshock is an earthquake that occurs before a larger seismic event (the mainshock) and is related to it in both time and space. The designation of an earthquake as ''foreshock'', ''mainshock'' or aftershock is only possible after the full sequence of events has happened. Occurrence Foreshock activity has been detected for about 40% of all moderate to large earthquakes, and about 70% for events of M>7.0. They occur from a matter of minutes to days or even longer before the main shock; for example, the 2002 Sumatra earthquake is regarded as a foreshock of the 2004 Indian Ocean earthquake with a delay of more than two years between the two events. Some great earthquakes (M>8.0) show no foreshock activity at all, such as the M8.6 1950 India–China earthquake. The increase in foreshock activity is difficult to quantify for individual earthquakes but becomes apparent when combining the results of many different events. From such combined observations, the increase before the mai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epicenter
The epicenter, epicentre () or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates. Surface damage Before the instrumental period of earthquake observation, the epicenter was thought to be the location where the greatest damage occurred, but the subsurface fault rupture may be long and spread surface damage across the entire rupture zone. As an example, in the magnitude 7.9 Denali earthquake of 2002 in Alaska, the epicenter was at the western end of the rupture, but the greatest damage was about away at the eastern end. Focal depths of earthquakes occurring in continental crust mostly range from . Continental earthquakes below are rare whereas in subduction zone earthquakes can originate at depths deeper than . Epicentral distance During an earthquake, seismic waves propagate in all directions from the hypocenter. Seismic shadowing occurs on the opposite s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismological Society Of America
The Seismological Society of America (SSA) is an international scientific society devoted to the advancement of seismology and the understanding of earthquakes for the benefit of society. Founded in 1906, the society has members throughout the world representing seismologists and other geophysicists, geologists, engineers, insurers, and policy-makers in preparedness and safety. History The society was established by academic, government, and other scientific and engineering professionals in the months following the April 18th San Francisco earthquake, with the first meeting of the Board of Directors taking place on December 1, 1906. Publications The Seismological Society of America publishes the ''Bulletin of the Seismological Society of America'' (''BSSA''), a journal of research in earthquake seismology and related disciplines since 1911, and ''Seismological Research Letters'' (''SRL''), which serves as a forum for informal communication among seismologists, as well as betw ... [...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] |
San Bernardino, California
San Bernardino (; Spanish for "Saint Bernardino") is a city and county seat of San Bernardino County, California, United States. Located in the Inland Empire region of Southern California, the city had a population of 222,101 in the 2020 census, making it the 18th-largest city in California. San Bernardino is the economic, cultural, and political hub of the San Bernardino Valley and the Inland Empire. The governments of El Salvador, Guatemala, and Mexico have established the metropolitan area’s only consulates in the downtown area of the city. Additionally, San Bernardino serves as an anchor city to the 3rd largest metropolitan area in California (after Los Angeles and San Francisco) and the 13th largest metropolitan area in the United States; the San Bernardino-Riverside MSA. Furthermore, the city’s University District serves as a college town, as home to California State University, San Bernardino. San Bernardino was named in 1810, when Spanish priest Francisco Du ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcano
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magma
Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural satellites. Besides molten rock, magma may also contain suspended crystals and gas bubbles. Magma is produced by melting of the mantle or the crust in various tectonic settings, which on Earth include subduction zones, continental rift zones, mid-ocean ridges and hotspots. Mantle and crustal melts migrate upwards through the crust where they are thought to be stored in magma chambers or trans-crustal crystal-rich mush zones. During magma's storage in the crust, its composition may be modified by fractional crystallization, contamination with crustal melts, magma mixing, and degassing. Following its ascent through the crust, magma may feed a volcano and be extruded as lava, or it may solidify underground to form an intrusion, such as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spectral Signature
Spectral signature is the variation of reflectance or emittance of a material with respect to wavelengths (i.e., reflectance/emittance as a function of wavelength). The spectral signature of stars indicates the composition of the stellar atmosphere. The spectral signature of an object is a function of the incidental EM wavelength and material interaction with that section of the electromagnetic spectrum. The measurements can be made with various instruments, including a task specific spectrometer, although the most common method is separation of the red, green, blue and near infrared portion of the EM spectrum as acquired by digital cameras. Calibrating spectral signatures under specific illumination are collected in order to apply a correction to airborne or satellite imagery digital images. The user of one kind of spectroscope looks through it at a tube of ionized gas. The user sees specific lines of colour falling on a graduated scale. Each substance will have its own uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cholame, California
Cholame (; Salinan: ''Tco'alam'') is an unincorporated community in San Luis Obispo County, California, United States. It sits within a mile of the San Andreas Fault at an elevation of above sea level and is located at . Cholame is reached via State Route 41, just southwest of the junction of Route 46. Rainfall data from a nearby ranch shows that the area around Cholame only receives about eight to nine inches (200–230 mm) of rain in a normal year. History Cholame was originally a rancheria of the Salinian Indians, Rancho Cholame was an 1844 Mexican land grant. In 1867 William Welles Hollister (1818–1886) purchased Rancho Cholame. Hollister sold a half interest in the rancho to Robert Edgar Jack in 1869.Dan Krieger, "Ranch Near Where James Dean Died in Crash Has a Long History," ''San Luis Obispo Tribune,'' May 17, 2015, page B3] Jack studied at Maine Wesleyan Seminary, and he later was an accountant at a shipping house in New York City. In the Civil War he enl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
