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and Sieh, K., 1980, Disturbance of trees by the 1857 Fort Tejon earthquake, California: J. Sieh, K., 1978, Slip along the San Andreas Fault associated with the great 1857 earthquake: Seismol.Sieh, K., 1978, Central California foreshocks of the great 1857 earthquake: Seismol.and Sieh, K., 1978, A documentary study of the felt effects of the great California earthquake of 1857: Seismol. Eyewitness Accounts ( California Geology).The Great 1857 "Fort Tejon" Earthquake: Shake, Rattle, and Roll! ( Fort Tejon State Historic Park monthly newsletter).
SAN ANDREAS QUAKE PROFESSIONAL
Geological Survey Professional Paper 1527, United States Government Printing Office, Washington: 1993. Isoseismal Map abridged from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Isoseismals are based on intensity estimates from data. Many aftershocks occurred, and two (January 9 and 16) were large enough to have been widely felt.Ībridged from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Several slight to moderate foreshocks preceded the main shock by 1 to 9 hours. Changes in the flow of water in wells were reported from the Santa Clara Valley in northern California.įelt from Marysville south to San Diego and east to Las Vegas, Nevada. The waters of the Kern, Lake, Los Angeles, and Mokulumme Rivers overflowed their banks. One report describes sunken trees, possibly associated with liquefaction, in the area between Stockton and Sacramento.Ĭhanges in the flow of streams or springs were observed in the areas of San Diego, Santa Barbara, Isabella, and at the south end of San Joaquin Valley.
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Sandblows occurred at Santa Barbara and in the flood plain of the Santa Clara River.
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Ground fissures were observed in the beds of the Los Angeles, Santa Ana, and Santa Clara Rivers and at Santa Barbara. Instances of seiching, fissuring, sandblows andå hydrologic changes were reported from Sacramento to the Colorado River delta. Strong shaking lasted from 1 to 3 minutes. One person was killed in the collapse of an adobe house at Gorman. About 20 kilometers west of Fort Tejon, trees were uprooted, and buildings were destroyed between Fort Tejon and Elizabeth Lake. Two buildings were declared unsafe, three others were damaged extensively but were habitable, and still others sustained moderate damage. Property loss was heavy at Fort Tejon, an Army post about 7 kilometers from the San Andreas fault. 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. 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. Map showing the San Andreas fault in green, which caused the 1857 Fort Tejon eathquake.