Greater Los Angeles Area Southern California United States
Total damage
$33.5–40 million [2][3]
Max. intensity
MMI VII (Very strong)[3]
Peak acceleration
0.58 g at Cogswell Dam[4]
Landslides
Yes
Casualties
2 deaths [2] 100–107 injured [2][5]
The 1991 Sierra Madre earthquake occurred on June 28 at 07:43:55 local time with a moment magnitude of 5.6 and a maximum Mercalli intensity of VII (Very strong). The thrust earthquake resulted in two deaths, around 100 injuries, and damage estimated at $33.5–40 million. The event occurred beneath the San Gabriel Mountains on the Clamshell–Sawpit Fault, which is a part of the Sierra Madre–Cucamonga Fault System. Instruments captured the event at a number of strong motion stations in Southern California.
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