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Published April 1990 | Published
Journal Article Open

The 3 December 1988 Pasadena, California earthquake: Evidence for strike-slip motion on the Raymond fault

Abstract

The Pasadena earthquake (M_L = 4.9) occurred on 3 December 1988, at a depth of 16 km. The hypocenters of the earthquake and its aftershocks define a east-northeast striking, steeply northwest-dipping surface that projects up to the active surficial trace of the Raymond fault. One of the nodal planes of the focal mechanism of the earthquake parallels the Raymond fault with left-lateral strike-slip movement on that plane, and is consistent with geomorphic and paleoseismic evidence that the Raymond fault is dominantly a left-lateral strike-slip fault. The existence of a component of sinistral slip along the Raymond fault had been suspected prior to the earthquake, but the northward dip of the fault and the prominent scarp along the western portion of its trace had led most workers to conclude that slip along the fault was dominantly reverse.

Additional Information

© 1990 Seismological Society of America. Manuscript received 18 September 1989. We thank Jim Mori and Donna Eberhart-Phillips for constructive reviews. E. Hauksson was supported by USGS Grant 14-08-0001-G1328. L.K. Hutton was supported by USGS Cooperative Agreement 14-08-001-A0613. This study would have been impossible without the hard work and dedication of the analysts who process the data of the Southern California Seismic Network. Contribution Number 4774, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California.

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Created:
August 19, 2023
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October 23, 2023