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 (ML) ≧ 3.5, and several had ML < 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 ML ≧ 3.5, and a peak acceleration of 25 per cent g was recorded for the largest event, ML = 4.3.

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