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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 ).
Since the three damaging earthquakes that occurred in the American Midwest and the United States East Coast ( 1755 Cape Ann, 1811–12 New Madrid, 1886 Charleston) were well known, it became apparent to settlers that the earthquake hazard was different in California. While the 1812 San Juan Capistrano, 1857 Fort Tejon, and 1872 Owens Valley ...
The 1999 Hector Mine earthquake occurred in Southern California, United States, on October 16 at 02:46:50 PDT. Its moment magnitude was 7.1 and the earthquake was preceded by 12 foreshocks, the largest of which had a magnitude of 3.8. The event is thought to have been triggered by the 1992 Landers earthquake which occurred seven years earlier.
6.1 Mw April 23 at 4:51 [4] Casualties. 3 killed. 400+ injured. The 1992 Landers earthquake occurred on Sunday, June 28 with an epicenter near the town of Landers, California, in San Bernardino County. [5] The shock had a moment magnitude of 7.3 and a maximum Mercalli intensity of IX ( Violent ). [6]
Approximate epicenters of the earthquakes in 1988. 4.0–5.9 magnitude. 6.0–6.9 magnitude. 7.0–7.9 magnitude. 8.0+ magnitude. Strongest magnitude. 7.8 M w United States, Gulf of Alaska. Deadliest. 6.8 M w Soviet Union, 1988 Armenian earthquake 25,000 dead.
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 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 ...