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	FTHA History - The Great 1857 "Fort Tejon" Earthquake
		Technically, Parkfield was the epicenter of this earthquake, as it was the origin of the rupture, but most scientists would be more concerned with the extent and location of the entire rupture; Fort Tejon was approximately the midway point of the rupture.
		Fort Tejon, on the other hand, suffered considerable damage from the mainshock, and it was battered by aftershocks for months and years to come -- both a direct consequence of the Fort's proximity to the fault.
		Fort Tejon, seems to be the region where her disease is located, for the good people of that Post, are almost nightly entertained with earthquake shocks.
	www.forttejon.org /historyearthquake.html (840 words)

	Earthquake - Wikipedia Mirror (Site not responding. Last check: 2007-10-13)
		Earthquakes occurring at boundaries of tectonic plates are called interplate earthquakes, while the less frequent events that occur in the interior of the lithospheric plates are called intraplate earthquakes.
		Earthquakes may also occur in volcanic regions and are caused by the movement of magma in volcanoes.
		Earthquakes have also been known to be caused by the removal of natural gas from subsurface deposits, for instance in the northern Netherlands.
	www.wiki-mirror.us /index.php/Earthquake (2891 words)

	Earthquake - Free net encyclopedia
		Earthquakes occur where the stress resulting from the differential motion of these plates exceeds the strength of the crust.
		Most earthquakes are tectonic, but they also occur in volcanic regions and as the result of a number of anthropogenic sources, such as reservoir induced seismicity, mining and the removal or injection of fluids into the crust.
		Deep focus earthquakes, at depths of hundreds of kilometres, are possibly generated as subducted lithospheric material catastrophically undergoes a phase transition since at the pressures and temperatures present at such depth elastic strain cannot be supported.
	www.netipedia.com /index.php/Earthquake (2367 words)

	The Great 1857 "Fort Tejon" Earthquake
		And the largest earthquake to hit Southern California in historic times occurred on January 9th, 1857, and it came to be known as the great "Fort Tejon" earthquake, although such appellation could be very misleading.
		Fort Tejon, in fact, was not the epicenter, nor was it even near the epicenter of the earthquake.
		In comparison to the other "great" earthquakes of historic times, the 1857 "Fort Tejon" earthquake was larger than the 1872 Owens Valley (estimated magnitude 7.8) quake, and was equally as large as, if not larger than, the 1906 "San Francisco" earthquake (estimated magnitude 7.9-8.0).
	www.cco.caltech.edu /~meltzner/tejon.html (672 words)

	SCEDC \| Fort Tejon Earthquake (1857)
		The Fort Tejon earthquake of 1857 was one of the greatest earthquakes ever recorded in the U.S., and left an amazing surface rupture scar over 350 kilometers in length along the San Andreas fault.
		Were the Fort Tejon shock to happen today, the damage would easily run into billions of dollars, and the loss of life would likely be substantial, as the present day communities of Wrightwood, Palmdale, Frazier Park, and Taft (among others) all lie upon or near the 1857 rupture area.
		The theoretical "Cholame" epicenter of the 1857 earthquake is marked with the large red dot -- Fort Tejon is shown by a white "x" on fl -- and that part of the San Andreas fault which exhibited surface rupture during the earthquake is shown in red.
	www.data.scec.org /chrono_index/forttejo.html (627 words)

	Fort Tejon earthquake - Wikipedia, the free encyclopedia
		The Fort Tejon earthquake occurred on January 9, 1857, with an estimated magnitude of 8.0 on the Richter Scale.
		It ruptured the San Andreas Fault for a length of 362 kilometers (225 miles), between Parkfield and San Bernardino.
		Only two fatalities were recorded as a result of this earthquake, one from a collapsing adobe house in Fort Tejon.
	en.wikipedia.org /wiki/Fort_Tejon_earthquake (152 words)

	FTHA History
		State Historian II Fort Tejon is located in the Grapevine Canyon, the main route between California's great central valley and Southern California.
		The fort was established to protect and control the Indians who were living on the Sebastian Indians Reservation, and to protect both the Indians and white settlers from raids by the wide-ranging and rather warlike Paiutes, Chemeheui, Mojave, and other Indian groups of the desert regions to the south east.
		Fort Tejon was first garrisoned by the United States Army on August 10, 1854 and was abandoned ten years later on September 11, 1864.
	www.forttejon.org /history.html (478 words)

	Operational Area
		The greatest Southern California earthquake in modern history was the Fort Tejon Earthquake on January 9, 1857 that measured 8.0 on the Richter Scale.
		Were the Fort Tejon shock to happen today, the damage would easily run into billions of dollars, and the loss of life would be substantial.
		The Sierra Madre Earthquake was magnitude 5.8 and occurred on June 28, 1991 at 7:43 a.m.
	lacoa.org /historicalinfo.htm (663 words)

	CurEvents.com - A Global Current Events Discussion Forum - View Single Post - Was the Parkfield earthquake a foreshock ... (Site not responding. Last check: 2007-10-13)
		The earthquake is called the Fort Tejon earthquake because that is the area that suffered the largest measured displacement of the fault.
		If you look at research regarding Parkfield earthquakes that was written prior to the September quake, nearly every researcher suggests that the next Parkfield quake could be a foreshock to a repeat of the 1857 Fort Tejon quake.
		Alternatively, the characteristic earthquake might stop at the en echelon offset and, by analogy to the triggering mechanism of the early foreshock of ML 5.0 in 1934, increase the right-Lateral shear stress on the fault southeast of the rupture zone.
	www.curevents.com /vb/showpost.php?p=7347&postcount=1 (1358 words)

	Earthquake History: JANUARY 9, 1857 (M=8-1/4) (Site not responding. Last check: 2007-10-13)
		The great Fort Tejon earthquake of January 9, 1857, ruptured 300 km of the San Andreas fault from near Parkfield to Wrightwood and offset the fault by as much as 9-1/2 m on the Carrizo Plain.
		The fault rupture and the effects of the earthquake have been extensively studied, notably by Agnew and Sieh (1978) and Sieh (1978b).
		A summary magnitude of M=8-1/4 was assigned by analogy with the 1906 earthquake.
	www.johnmartin.com /earthquakes/eqsafs/safs_609.htm (275 words)

	Fort Tejon SHP
		Fort Tejon is located in the Grapevine Canyon, the main route between California's great central valley and Southern California.
		The fort was established to protect and control the Indians who were living on the Sebastian Indian Reservation, and to protect both the Indians and white settlers from raids by the Paiutes, Chemeheui, Mojave, and other Indian groups of the desert regions to the south east.
		At Fort Tejon visitors are always welcome and the modern world is checked at the gate.
	www.parks.ca.gov /default.asp?page_id=585 (459 words)

	The American Museum of Natural History - EarthBulletin Southern California: The Earthquake Laboratory (Site not responding. Last check: 2007-10-13)
		But earthquake hazard is a measure not only of the expected number and magnitude of earthquakes but also of the potential damage-to people, to property, to infrastructure.
		The size of an earthquake is directly related to the length of a fault, and the San Andreas is the longest fault in California by far.
		Although a large earthquake strikes the section of the San Andreas Fault nearest Los Angeles on average every 130 years, the last one was the Fort Tejon quake in 1857, when the area was relatively unpopulated.
	earthbulletin.amnh.org /A/1/2 (1637 words)

	Tremors rock earth deep beneath San Andreas Fault / Puzzling vibrations baffle researchers
		What concerns Nadeau and his colleagues is that the epicenter of the great 1857 Fort Tejon earthquake, whose magnitude has been estimated at 7.8 to 8, was located almost exactly where the deep tremors are now occurring -- beneath the San Luis Obispo County village of Cholame, some 17 miles south of Parkfield.
		The Fort Tejon event rocked the ground violently and ruptured the fault for 225 miles, from northwest of Parkfield to San Bernardino.
		It is now 148 years since the Fort Tejon event, so the possibility of another one may be steadily increasing, they say.
	sfgate.com /cgi-bin/article.cgi?file=/c/a/2004/12/10/TREMORS.TMP&type=printable (827 words)

	1857 Ft. Tejon Earthquake: In Brief (Site not responding. Last check: 2007-10-13)
		Many people think that the 1906 San Francisco earthquake was the largest earthquake to strike California in historical times, but that distinction actually belongs to the shaker that rocked southern and central California on January 9, 1857, uprooting trees in the San Bernardino Mountains and causing the Kern River to flow backwards for a time.
		Since it is already 144 years since the last earthquake, the next one may not be too far in the future.
		Despite the size of the earthquake, it occurred far enough away that only minor damage occurred in Santa Barbara, although the earthquake was strongly felt in that city.
	projects.crustal.ucsb.edu /sb_eqs/1857/1857.html (249 words)

	How Often do Earthquakes Occur? (Site not responding. Last check: 2007-10-13)
		Second, the 1857 earthquake was well recorded historically most notably by the residents of nearby Fort Tejon.
		A detailed description of the Fort Tejon earthquake, one of California's largest, is available on-line at the Southern California Earthquake Center.
		In addition, the Loma Prieta earthquake was preceded by a spike in the ambient electromagnetic field and other earthquakes have been preceded by small deformations of the ground surface, small releases of radon gas in wells, and small changes of water level level in wells.
	www.cs.csubak.edu /Geology/Faculty/Negrini/ITF_course/EarthquakeFreq.html (1613 words)

	Fort Tejon Earthquake (Site not responding. Last check: 2007-10-13)
		That's the sentiment of the development group led by Tejon Ranch Co. that has petitioned for approval of a massive, 18-square-mile master-planned community high in the northwest corner of the county.
		It also would border the San Andreas Fault and be less than 10 miles from Fort Tejon, whose namesake earthquake in 1857 was, at a 7.9 magnitude, the largest earthquake recorded in California history.
		Founded in 1843, Tejon Ranch was hit 14 years later when an earthquake centered 45 miles northeast of San Luis Obisbo caused ruptures as long as 30 feet in the Fort Tejon area, killing two people, according to the Southern California Earthquake Data Center.
	www.allaboutearthquakes.info /fort-tejon-earthquake.htm (1196 words)

	Earthquake Facts
		The last major earthquake along this section was, indeed, the largest earthquake in southern California in recorded history, but that was the Fort Tejon earthquake, which happened back in 1857.
		Although epicenters were originally located by a rough estimate of the zone of strongest shaking in an earthquake, the advent of modern seismology allowed the source of an earthquake to be pinpointed.
		Some feel that an earthquake should be named for the community that is subjected to the strongest shaking in that quake; others think the location of the epicenter should be the main criterion for selecting a name.
	www.scec.org /education/public/allfacts.html (1930 words)

	Strange tremors perplex seismic experts \| The San Diego Union-Tribune
		What concerns Nadeau and his colleagues is that the epicenter of the great 1857 Fort Tejon earthquake, whose magnitude has been estimated at 7.8 to 8, was located almost exactly where the deep tremors are occurring, beneath the San Luis Obispo County village of Cholame, 17 miles south of Parkfield.
		The Fort Tejon event was violent and ruptured the fault for 225 miles, from northwest of Parkfield to San Bernardino.
		It's been 148 years since the Fort Tejon event, so the possibility of another one may be steadily increasing, they say.
	www.signonsandiego.com /uniontrib/20041211/news_1n11tremors.html (441 words)

	CurEvents.com - A Global Current Events Discussion Forum - Was the Parkfield earthquake a foreshock to a much larger ... (Site not responding. Last check: 2007-10-13)
		With access to databases of earthquakes and lunar information going back to the beginning of time, it would be easy to compile the research and present a paper on the subject.
		Cochran and Vidale found a strong correlation between when earthquakes strike and when tidal stress on fault planes is high, and the likelihood of these results occurring by chance is less than one in 10,000, Cochran said.
		In California, tides may vary the rate of earthquakes at most one or two percent; the overall effect of the tides is smaller, he said, because the faults studied are many miles inland from the coast and the tides are not particularly large.
	www.curevents.com /vb/showthread.php?t=989 (8178 words)

	San Andreas Fault System (Site not responding. Last check: 2007-10-13)
		Are the 1922, 1934, and 1966 earthquakes “characteristic”
		Unlike the 1922, 1934 and 1966 shocks which ruptured from northwest to southeast, the 2004 quake initiated at the southeast end and ruptured to the northwest.
		To see the slabs above the upper deck separate by feet and come back together, and watch the light stanchions sway left and right from the apex to the center, about fifteen feet either way, it was a sight to behold, if you've never seen it.
	www.uky.edu /AS/Geology/clepper2/150/GLY150Lecture9.htm (673 words)

	LiveScience.com - Ominous Rumbling Under San Andreas Fault
		The town of Cholame is thought to have been the origin of the magnitude 8 Fort Tejon Earthquake of 1857.
		Although the study was no longer running at the time, a moderate, magnitude 6 earthquake erupted on Sept. 28, 2004, outside the city of Parkfield, which is 15 miles northwest of Cholame.
		Parkfield describes itself as the "Earthquake Capital of the World" because for 20 years seismologists have been studying the fault-line that cuts through the city.
	www.livescience.com /forcesofnature/041209_earthquake_prediction.html (656 words)

	USGS Earthquake Hazards Program » Historic Earthquakes
		This earthquake occurred on the San Andreas fault, which ruptured from near Parkfield (in the Cholame Valley) almost to Wrightwood (a distance of about 300 kilometers); horizontal displacement of as much as 9 meters was observed on the Carrizo Plain.
		A comparison of this shock to the San Francisco earthquake, which occurred on the San Andreas fault on April 18, 1906, shows that the fault break in 1906 was longer but that the maximum and average displacements in 1857 were larger.
		About 20 kilometers west of Fort Tejon, trees were uprooted, and buildings were destroyed between Fort Tejon and Elizabeth Lake.
	earthquake.usgs.gov /regional/states/events/1857_01_09.php (398 words)

	California Earthquakes
		Thirty people were killed in the region of Hayward and San Leandro due to a strong earthquake that occurred on the Hayward fault in October 1868.
		The earthquake of November 1927 wrecked chimneys at Lompoc, shifted a house on its foundation, and caused heavy earth and rockslides on steep slopes.
		This earthquake was the first strong test of public schools designed to be earthquake-resistive after the 1933 Long Beach earthquake.
	www.sandiegohistory.org /links/earthquakes.htm (576 words)

	[No title]
		Fort Tejon was not the epicenter of the earthquake.
		Although Parkfield was technically the epicenter (place of origin), Fort Tejon has become known as the epicenter because it was the approximate midway point of the rupture.
		A shutter ridge is on the left and the fault is in the diverted creek bottom to the right The red line shows the known break of the 1857 Fort Tejon earthquake, which began at Parkfield.
	www.env.duke.edu /eos/fieldtrips/SanAndreas/Stops/20_1857quake.doc (1498 words)

	My Research
		I spent the summer analyzing the foreshocks and aftershocks of the 1857 Fort Tejon earthquake, which was the last major earthquake on the central and southern segments of the San Andreas Fault.
		We conducted a study to locate and to estimate magnitudes for the largest foreshocks and aftershocks of the 1857 M= 7.9 "Fort Tejon" earthquake on the central and southern segments of the fault.
		From earthquake logs at Fort Tejon, we conclude that the aftershock sequence lasted a minimum of 3.75 years.
	www.cco.caltech.edu /~meltzner/research.html (1360 words)

	Eye-witness geology, Dust from Antelope,The Fort Tejon Earthquake of 1857
		The earthquake is probably the southern California Earthquake of 1857, sometimes called the Fort Tejon Earthquake.
		It's possible for a big earthquake to do only a modicum of damage because population and construction are sparse; conversely, a small quake can cause a great deal of local damage if it is centered in a densely settled area.
		The area has had many little earthquakes, but Wood wrote that "there can be no doubt that this 1857 earthquake was the largest and strongest shock which has occurred in south-central and southern California since the occupation of this region by white men" (p.
	www.johnmartin.com /earthquakes/eqpapers/00000024.htm (2165 words)

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