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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 1971 San Fernando earthquake (also known as the 1971 Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The unanticipated thrust earthquake had a magnitude of 6.5 on the Ms scale and 6.6 on the Mw scale, and a maximum Mercalli intensity of XI ( Extreme ).
2. 2022 Ferndale earthquake [ 35] April 5, 2024. New Jersey. 4.8 M w. 0. 2024 New Jersey earthquake [ 36] Two-percent probability of exceedance in 50 years map of peak ground acceleration from the United States Geological Survey, released July 17, 2014.
The July 2019 Ridgecrest earthquakes consist of three main shocks of magnitudes 6.4, 5.4, and 7.1, each followed by a flurry of aftershocks of substantially lower magnitude. The aftershocks of the Ridgecrest earthquakes reveal two fault zones. The July 4 M 6.4 event (orange dot) occurred on the SW-NE fault where it intersects the NW-SE oriented ...
The 1978 Santa Barbara earthquake (also known as the Goleta earthquake ), occurred on August 13, 1978, 3:54 p.m. ( PDT) with its epicenter beneath the Santa Barbara Channel. [4] [5] The magnitude of the earthquake was estimated at ML 5.1 according to the Southern California Seismic Network; however, it may have been as high as 5.6 Mw. [1]
A magnitude 7.5 quake on the Puente Hills fault — which runs under highly populated areas of L.A. and Orange counties — could kill 3,000 to 18,000 people, according to the USGS and Southern ...
The 2008 Chino Hills earthquake occurred at 11:42:15 am PDT (18:42:15 UTC) on July 29 in Southern California. The epicenter of the magnitude 5.4 earthquake was in Chino Hills, c. 28 miles (45 km) east-southeast of downtown Los Angeles. Movement on an oblique-slip fault resulted in a maximum Mercalli intensity of VI ( Strong ).
A 3.8-magnitude earthquake shook the Southern California area, the U.S. Geological Survey reported.. The nearly 11-mile deep quake hit about 4 miles east northeast of Ojai in Ventura County, about ...