Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; August 1972; v. 62; no. 4; p. 927-932
© 1972 Seismological Society of America
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Observation of crustal tilt preceding an aftershock at San Fernando, California

ARTHUR G. SYLVESTER and DWIGT D. POLLARD

MARINE SCIENCE INSTITUTE AND DEPARTMENT OF GEOLOGICAL SCIENCES UNIVERSITY OF CALIFORNIA, SANTA BARBARA, CALIFORNIA 93106

Abstract

Anomalous drift of a theodolite plate-level bubble was observed about 5 hr before two of the stronger aftershocks of the San Fernando earthquake of February 9, 1971. The phenomenon may be related to crustal tilting during the accumulation of strain prior to the aftershocks.




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Earthquake precursors
Bulletin of the Seismological Society of America, October 1, 1975; 65(5): 1133 - 1162.
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