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Pasadena Earthquake

TIME  December 3, 1988 / 3:38 am PST
LOCATION  34° 8.47' N, 118° 7.96' W Directly below the city of Pasadena.
MAGNITUDE  ML5.0
TYPE OF FAULTING   left-lateral strike-slip, with very minor reverse
motion - ANIMATION
FAULT INVOLVED  Raymond fault
DEPTH  15.6 km

Apart from its effects on local residents, this quake was notable for a few seismological details. First, it was followed by an unusually small number of aftershocks for a quake of its magnitude, the largest of which was hardly noticable -- only a magnitude 2.4 (unless the Montebello earthquake is considered an aftershock of this event). Second, it served to bring the debate over the sense of motion of the Raymond fault closer to an end, by providing a clear example of left-lateral movement most likely located along that fault.