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The 1899 San Jacinto earthquake occurred on Christmas morning (December 25) at 04:25 local time in Southern California. The estimated moment magnitude 6.7 earthquake had an epicenter located 10 miles southeast of San Jacinto. The earthquake had a maximum Mercalli intensity of IX (Violent). Severe damage occurred, amounting to US$50,000 (1899 ...
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 San Jacinto Fault Zone and the San Andreas Fault (SAF) accommodate up to 80% of the slip rate between the North American and Pacific plates.The extreme southern portion of the SAF has experienced two moderate events in historical times, while the SJFZ is one of California's most active fault zones and has repeatedly produced both moderate and large events.
Learn more about the most powerful quakes in the Golden State.
1898 Mare Island earthquake; 1899 San Jacinto earthquake; 1906 San Francisco earthquake; 1915 Imperial Valley earthquakes; 1918 San Jacinto earthquake; 1925 Santa Barbara earthquake; 1927 Lompoc earthquake; 1932 Eureka earthquake; 1933 Long Beach earthquake; 1940 El Centro earthquake; 1948 Desert Hot Springs earthquake; 1952 Kern County ...
On Monday, southern California was rattled by a 4.4-magnitude earthquake that was felt all the way from Los Angeles to San Diego.Though no major damage occurred, the quake was caused by a fault ...
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California's approach to seismic safety, particularly in schools, ramped up significantly after the deadly March 10, 1933, earthquake in Long Beach.