The 1940 El Centro earthquake (or 1940 Imperial Valley earthquake) occurred at 21:35 Pacific Standard Time on May 18 (05:35 UTC on May 19) in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico. It had a moment magnitude of 6.9 and a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. It was the first major earthquake to be recorded by a strong-motion seismograph located next to a fault rupture.[4] The earthquake was characterized as a typical moderate-sized destructive event with a complex energy release signature.[5] It was the strongest recorded earthquake in the Imperial Valley, causing widespread damage to irrigation systems and killing nine people.[3]
^ abcdStover & Coffman 1993, p. 81
^ abCite error: The named reference Stover_p135 was invoked but never defined (see the help page).
^ abCite error: The named reference scec was invoked but never defined (see the help page).
^Hough, S.E. (2004). Finding fault in California: an earthquake tourist's guide. Mountain Press Publishing. p. 185. ISBN 978-0-87842-495-5.
^Trifunac & Brune 1970, p. 138
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