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Published August 1970 | Published
Journal Article Open

Earthquake swarm in the Santa Barbara Channel, California, 1968


Sixty-three minor earthquakes (maximum magnitude = 5.2) occurred in the Santa Barbara Channel during the period June 26 to August 3 1968. The epicenters form a shot-scatter pattern upon a broad, high-standing fault block in the channel midway between Santa Cruz Island and the City of Santa Barbara. Focal mechanism studies indicate that oblique-slip movement occurred along a northwest-striking fault even though the major folds and faults strike nearly east-west. Preliminary studies of the areal hydrocarbon production data show no compelling evidence for a causal relationship with the swarm.

Additional Information

Copyright © 1970, by the Seismological Society of America. Manuscript received January 9 1970. This research was supported in part by the National Science Foundation under Grant GA 1087 (Earthquake Mechanisms) to the Seismological Laboratory and under Sea Grant GH 43 to the U. C. S. B. Marine Science Institute. The technical assistance of John Nordquist of the Seismological Laboratory is gratefully acknowledged. Thanks are owing to Mr. Al Vail for allowing us to operate a temporary seismograph station on Santa Rosa Island, and to the U. S. Navy for their assistance on Santa Cruz Island.

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August 19, 2023
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