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NATIONAL CENTER FOR EARTHQUAKE RESEARCH U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025
Abstract
Intensive study of an earthquake sequence along a section of the San Andreas fault near Bear Valley, California (February-March 1972) reveals large velocity changes in the vicinity of the fault. These velocity changes are caused primarily by structural variations in the vicinity of the fault zone but may represent in part the effect of active tectonic processes.
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