DZIEWONSKI and Gilbert1, 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.
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Dziewonski, A. M., and Gilbert, F., Nature, 247, 185 (1974).
Love, A. E. H., A Treatise on the Mathematical Theory of Elasticity, 305 (Dover, New York, 1975).
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HART, R., KANAMORI, H. Search for compression before a deep earthquake. Nature 253, 333–336 (1975). https://doi.org/10.1038/253333a0
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