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LAMONT-DOHERTY GEOLOGICAL OBSERVATORY, PALISADES, NEW YORK 10964
DEPARTMENT OF GEOLOGICAL SCIENCES SAN DIEGO STATE UNIVERSITY, SAN DIEGO, CALIFORNIA 92182
DEPARTMENT OF GEOLOGICAL SCIENCES COLUMBIA UNIVERSITY, NEW YORK, NEW YORK 10027
Abstract
Left-lateral slip occurred on individual surface breaks along northeast-trending faults associated with the 24 November 1987 earthquake sequence in the Superstition Hills, Imperial Valley, California. This sequence included the Ms = 6.2 event on a left-lateral, northeast-trending "cross-fault" between the Superstition Hills fault (SHF) and Brawley seismic zone, which was spatially associated with the left-lateral surface breaks. Six distinct subparallel cross-faults broke at the surface, with rupture lengths ranging from about 
to 10 km and maximum displacements ranging from 30 to 130 mm. About half a day after the Ms = 6.2 event, an Ms = 6.6 earthquake nucleated near the intersection of the cross-faults with the SHF, and rupture propagated southeast along the SHF. Whereas right-lateral slip on the SHF occurred dominantly on a single trace in a narrow zone, the cross-fault surface slip was distributed over several stands across a 10-km-wide zone. Also, whereas afterslip accounted for a large proportion of total slip on the SHF, there is no evidence for afterslip on the cross-faults. We present documentation of these surface ruptures. A simple mechanical model of faulting illustrates how the foreshock sequence may have triggered the main rupture. Displacement on other cross-faults could trigger an event on the southern San Andreas fault by a similar mechanism in the future.
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