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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 M s scale and 6.6 on the M w scale, and a maximum Mercalli intensity of XI ( Extreme ).
1971-02-09: San Fernando LA Area: 6.6 M w: XI 58–65 200–2,000 $505–553M 1969-10-01: Santa Rosa North Bay: ... Southern California Earthquake Data Center;
United States, San Fernando Valley, California: 6.6: 9.0: XI One of the most destructive events to affect southern California. 65 people were killed and over 2,000 were injured in the 1971 San Fernando earthquake. Extensive property damage was reported with costs $505 million (1971 rate). 65: 2,000 14 [32] [33] [34] Iran, Semnan Province: 5.8 ...
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1969 Santa Rosa earthquakes: Doublet February 9, 1971: California: 6.5–6.7 M w 58 –65: 1971 San Fernando earthquake: July 30, 1972: Alaska 7.6 M w 0 [11] February 2, 1975: Alaska: 7.6 M s 0: 1975 Near Islands earthquake: November 29, 1975: Hawaii: 7.7 M w 2: 1975 Hawaii earthquake [12] November 8, 1980: California 7.2 M w 5 1980 Eureka ...
The Van Norman Dams, also known as the San Fernando Dams, were the terminus of the Los Angeles Aqueduct, supplying about 80 percent of Los Angeles' water, [5] until they were damaged in the 1971 San Fernando earthquake and were subsequently decommissioned due to the inherent instability of the site and their location directly above heavily populated areas.
Having half a dozen earthquakes with a magnitude 2.5 or greater strike in a single week is not a common occurrence in Southern California.
Most of the 33 buildings are in the Los Angeles Basin, which has been spared the strongest shaking of L.A. County’s two most destructive earthquakes since World War II — the magnitude 6.6 ...