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Aftershocks of the February 21, 1973 Point Mugu, California earthquake

DONALD J. STIERMAN^* and WILLIAM L. ELLSWORTH

U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CA 94025

Abstract

The M_L 6.0 Point Mugu, California earthquake of February 21, 1973 and its aftershocks occurred within the complex fault system that bounds the southern front of the Transverse Ranges province of southern California. P-wave fault plane solutions for 51 events include reverse, strike slip and normal faulting mechanisms, indicating complex deformation within the 10-km broad fault zone. Hypocenters of 141 aftershocks fail to delineate any single fault plane clearly associated with the main shock rupture. Most aftershocks cluster in a region 5 km in diameter centered 5 km from the main shock hypocenter and well beyond the extent of fault rupture estimated from analysis of body-wave radiation. Strain release within the imbricate fault zone was controlled by slip on preexisting planes of weakness under the influence of a NE-SW compressive stress.

Footnotes

^* Present Address: Department of Geophysics, Stanford University, Stanford, CA 94305.

Present Address: U.S. Geological Survey, Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139.

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