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Recent earthquake activity in the Santa Barbara Channel region^*

NATIONAL CENTER FOR EARTHQUAKE RESEARCH U.S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA 94025

Abstract

A new network of seismograph stations surrounding the Santa Barbara Channel was established by the U.S. Geological Survey in late 1969. During the first 2 years of operation, 107 earthquakes were located in the region. The distribution of earthquake epicenters shows an east-west trending pattern that seems to be spatially related to offshore faults inferred from acoustic profiling. A composite first-motion plot from a cluster of ten earthquakes in the eastern channel suggests left-lateral strike-slip movements along a steeply dipping fault plane.

Footnotes

^* Publication authorized by the Director, U.S. Geological Survey.

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