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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 ...
Probabilistic seismic hazard map. The earliest known earthquake in the U.S. state of California 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 ...
In 1985, the US Geological Survey predicted that there would be a comparably-sized earthquake in this community by 1993, but no such event came until September 28, 2004, when a 6.0 Mw earthquake struck at 10:15 am Pacific Daylight Time. [5] Parkfield is the most closely observed earthquake zone in the world.
Southern California's last "Big One" was in 1857, when an earthquake with a magnitude of roughly 7.9 ruptured 225 miles of fault on the San Andreas, between Monterey and San Bernardino counties.
The year 2004 had the most major earthquakes since 1999. In total, there were 16 magnitude 7.0+ earthquakes this year, 6 of them were in Indonesia. The vast majority of the earthquake deaths in 2004 were caused by the magnitude 9.1–9.3 earthquake off the west coast of Sumatra in December.
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The Puente Hills system is capable of producing a magnitude 7.5 earthquake, which runs under highly populated areas of L.A. and Orange counties and could kill 3,000 to 18,000 people, according to ...
The probability of a serious earthquake on various faults has been estimated in the 2008 Uniform California Earthquake Rupture Forecast. According to the United States Geological Survey, Southern California experiences nearly 10,000 earthquakes every year. [3] Details on specific faults can be found in the USGS Quaternary Fault and Fold Database.