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A note on relocating the 1963 Watsonville earthquakes

SEISMOGRAPHIC STATION DEPARTMENT OF GEOLOGY AND GEOPHYSICS UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA 94720

Abstract

Events in the Watsonville earthquake sequence of August and September 1963 were found by Udias (1965) not to concentrate on the main San Andreas fault break. New locations are found using a more site-specific velocity model with carefully determined station adjustments. Resulting relocated hypocenters indicate that this sequence probably does not exhibit the anomalous spatial scatter found previously. The revised locations are found to be consistent with patterns of recent seismicity, based on dense network coverage, which show a tight coincidence with the San Andreas fault.

Footnotes

^* Present address: Geophysics Program, Department of Geology, University of Kansas, Lawrence, Kansas 66045.

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