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Earthquakes and disturbances to leveling in the Imperial Valley, 1930-1931

Wood, Harry O. (1942) Earthquakes and disturbances to leveling in the Imperial Valley, 1930-1931. Bulletin of the Seismological Society of America, 32 (4). pp. 257-268. ISSN 0037-1106. doi:10.1785/BSSA0320040257.

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Comparison in 1931 of the findings of field investigation in 1930 of the earthquakes of February 25 and March 1 of that year in the Imperial Valley, California, with disturbances to leveling found in the 1931 retracement of precise leveling surveyed in 1926-1927, and 1928, by the U. S. Coast and Geodetic Survey led to the conclusion that there was no discernible correlation except in one instance, and that doubtful. Occurrence of the 1940 earthquake with disclosure of a surface fault offset necessitates review and reconsideration. The revised conclusion is that two of the disturbances to leveling found in 1931 may probably be correlated with activity on this fault zone, but that the disturbances are quite as likely due to secondary effects caused by shaking as to primary surface warping or tilting and probably more so. The necessity of frequently repeated precise surveys is emphasized.

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Additional Information:© 1942 by the Seismological Society of America. Manuscript received for publication August 5, 1942. The writer's indebtedness to the report by Rappleye, and to the Director, and the Chief of the Division of Geodesy, of the U. S. Coast and Geodetic Survey, who made it available to him, is obvious and is gratefully acknowledged. The field work done by the writer, here first discussed in writing, was performed in the service of the Carnegie Institution of Washington in the regular course of the work of the Seismological Laboratory. Indebtedness to his colleagues, Buwalda and Richter, for unpublished information privately communicated is gratefully acknowledged, as well as assistance rendered by Mr. John M. Nordquist and other members of the staff of the Laboratory. Thanks are due to Mr. W. H. Kirkbride, Chief Engineer of the Southern Pacific Company, for information confirming the identity of the former station, Keystone, with the present Grape.
Group:Seismological Laboratory
Issue or Number:4
Record Number:CaltechAUTHORS:20190917-143704123
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Official Citation:Harry O. Wood; Earthquakes and disturbances to leveling in the Imperial Valley, 1930-1931. Bulletin of the Seismological Society of America; 32(4): 257–268.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98692
Deposited By: Tony Diaz
Deposited On:17 Sep 2019 22:30
Last Modified:16 Nov 2021 17:40

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