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.

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