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1999 Hector Mine earthquake : ウィキペディア英語版 | 1999 Hector Mine earthquake
|date = |origintime = 02:46:44 PDT |magnitude = 7.1 Mw |depth = |countries affected = Southern California United States |location = |type = Strike-slip 〔 |intensity = VIII (''Severe'')〔(Event Hector_Mine Map )〕 |foreshocks = 3.8 ML Oct 16 at 02:41 〔 |casualties = 5 injured }} The 1999 Hector Mine earthquake occurred on October 16 at 02:46:44 PDT with a moment magnitude of 7.1 and a maximum Mercalli intensity of VIII (''Severe''). The strike-slip earthquake occurred in a remote part of the Mojave Desert, east-southeast of Barstow, California, inside the Twentynine Palms Marine Corps Base. Its name comes from a nearby quarry named Hector Mine, which is located northwest of the epicenter. ==Foreshocks== The sequence of 12 foreshocks of up to magnitude 3.8 that began 20 hours before the Hector Mine event occurred in the same location as a cluster of off-fault aftershocks of the Landers quake.〔(SCEDC - Hector Mine Earthquake )〕
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