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List of earthquakes in California
Earthquakes in California are common occurrences since the state is located on the San Andreas Fault, which cuts across California and forms the tectonic plate boundary between the Pacific and the North American Plate. There are many thousands of small earthquakes per year, most of them so small that they are not felt. California's complex landscape can be attributed to the network of faults that run through the state. The earliest reported earthquake in California was felt in 1769 by the Portola expedition about 30 miles southeast of Los Angeles.〔(【引用サイトリンク】title=Earthquake History for California )〕〔(【引用サイトリンク】title=Earthquake Facts )〕
==Summary==
California has numerous active faults throughout the state which are known to produce large earthquakes. The most active of these is the San Jacinto Fault Zone in Southern California, which has produced large events on a regular basis throughout recent history. The Mendocino Triple Junction located offshore of Northern California is also very active, producing many earthquakes above M6 throughout history.〔(Mendocino Triple Junction Offshore Northern California )〕 Northern California is also subject to megathrust earthquakes on the Cascadia subduction zone (extending north from Mendocino), such as the 1700 Cascadia earthquake, magnitude of approximately 9. The town of Parkfield in central California is located on a section of the San Andreas Fault that produces an earthquake of about M6 every 20–30 years on average in 1857, 1881, 1901, 1922, 1934, 1966 and 2004.〔(The Parkfield, California, Earthquake Experiment ) USGS〕
The largest recorded earthquake in California was the 1857 Fort Tejon earthquake, with an estimated magnitude of 7.9. This earthquake ruptured the San Andreas Fault from Parkfield to Wrightwood, a distance of 225 miles (350 km). The most destructive earthquake to date was the 7.8 magnitude 1906 San Francisco earthquake, when more than 3000 people perished in the earthquake and the fires that followed. The 1906 quake ruptured the northern segment of the San Andreas Fault for 296 miles (477 km), from San Juan Bautista to near Cape Mendocino in the north.〔(The Great 1906 San Francisco Earthquake ) USGS〕 More recently, the 1989 Loma Prieta earthquake, which registered 6.9 and affected the San Francisco Bay Area,〔(【引用サイトリンク】title=October 17, 1989 Loma Prieta Earthquake )〕 and the 1994 Northridge earthquake which registered 6.7 and hit the Greater Los Angeles Area,〔(【引用サイトリンク】title=January 17, 1994 Northridge, CA Earthquake )〕 caused widespread damage and deaths in their respective regions.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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