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Published January 31, 1975 | public
Journal Article

Search for compression before a deep earthquake

Abstract

Dziewonski and Gilbert, using a moment tensor representation of the seismic source, presented evidence for precursive compression before deep earthquakes. For the Colombian earthquake of July 31, 1970 (17:08:05.4 GMT, 1.5° S, 72.6° W, h > 650 km), they concluded that a large precursive compression occurred in the focal region, beginning about 80 s before the origin times as determined by ordinary P wave travel times.

Additional Information

© 1975 Nature Publishing Group. Received June 10, 1974. One of us (R. S. H.) thanks the National Science Foundation for Graduate Fellowship support. We thank Professors Dziewonski and Gilbert for their comments on this manuscript. This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Air Force Office of Scientific Research.

Additional details

Created:
August 22, 2023
Modified:
October 20, 2023