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Strong-motion earthquake accelerograms at Brawley, California: January 25, 1975^*

U.S. GEOLOGICAL SURVEY, 15000 AVIATION BLVD, LAWNDALE, CALIFORNIA 90261
U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025

Abstract

During the Brawley earthquake swarm of January–February, 1975, a single strong-motion accelerograph installed after the swarm began recorded 27 positively identified earthquakes in 14 hr, at hypocentral distances of approximately 5 km. Eight of these had magnitudes (M_L) 3.5, and several had M_L < 2.5; the instrument independently triggered 18 times. Peak accelerations in excess of 10 per cent g were obtained for five of the eight earthquakes with M_L 3.5, and a peak acceleration of 25 per cent g was recorded for the largest event, M_L = 4.3.

Footnotes

^* Publication was authorized by the Director, U.S. Geological Survey.

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