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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 documented earthquakes.
The 1994 Northridge earthquake affected the Los Angeles area of California on January 17, 1994, at 04:30:55 PST. The epicenter of the moment magnitude 6.7 ( M w ) blind thrust earthquake was beneath the San Fernando Valley . [ 3 ]
The 2003 San Simeon earthquake struck at 11:15 PST (19:15 UTC) on December 22 on the Central Coast of California, about 7 miles (11 km) northeast of San Simeon.Probably centered in the Oceanic fault zone within the Santa Lucia Mountains, it was caused by thrust faulting and the rupture propagated southeast from the hypocenter for 12 miles (19 km).
1979 Imperial Valley earthquake – magnitude 6.4 earthquake with an epicenter less than 1 km inside Mexico – significant damage and injuries on both sides of the border (60 in the US) 2010 Baja California earthquake (Mexico near S California) – magnitude 7.2 earthquake, 4 fatalities and 100 injuries, none in the United States
On October 17, 1989, at 5:04 p.m. local time, the Loma Prieta earthquake occurred at the Central Coast of California. The shock was centered in The Forest of Nisene Marks State Park in Santa Cruz County, approximately 10 mi (16 km) northeast of Santa Cruz on a section of the San Andreas Fault System and was named for the nearby Loma Prieta Peak in the Santa Cruz Mountains.
In recent days, Southern California has experienced one earthquake after another. A 3.6 in Ojai on May 31. ... There have been six quakes above magnitude 7 along the fault in the last 12,000 years ...
In Southern California, the last major earthquake on the San Andreas fault was in 1857, estimated at somewhere around a magnitude 7.8. But even moderate quakes along the Puente Hills thrust fault ...
In fact, recent seiches caused by a magnitude 7.9 earthquake in the Gulf of Alaska in 2018, a magnitude 7.1 earthquake in California in 2019 and a magnitude 7.6 earthquake in Mexico in 2022 ...