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Statistical analysis of recent fault-plane solutions of earthquakes

Scheidegger, A. E. (1959) Statistical analysis of recent fault-plane solutions of earthquakes. Bulletin of the Seismological Society of America, 49 (4). pp. 337-347. ISSN 0037-1106.

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The large number of fault-plane solutions at present available in the literature permit one to calculate several statistical averages that have an important bearing upon geotectonics. The present paper represents a continuation of earlier work in this direction: 101 new fault-plane solutions are listed and the ratio of pressure to tension, strike slip to dip slip, and the average slip angle have been calculated for nine earthquake areas. Some of the older results are thereby corroborated, viz., that the “normal” character of earthquakes is to represent strike-slip faulting, and that the central Asian regions constitute an exception to this rule. In addition, it is now possible to make a breakdown with regard to depth. In this, a peculiar situation is found at 0.03 R depth, where the slip angle reaches a maximum. If the relationship between shallow and deep earthquakes be considered for any one area, however, it turns out that they are on the whole of the same character. Thus, whatever it is that causes earthquakes, acts in a similar fashion at all depths in any one area, but differs from one area to another.

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Additional Information:Copyright © 1959, by the Seismological Society of America. Manuscript received for publication March 24, 1959. The present study was carried out at the California Institute of Technology in Pasadena, where the writer has been invited to spend a period as visitor. The writer is grateful to R. P. Sharp, Chairman of the Division of Geological Sciences, and F. Press, Director of the Seismological Laboratory, for the invitation and for the opportunity thus afforded to him to pursue his seismological research.
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Caltech Division of Geological Sciences926
Issue or Number:4
Record Number:CaltechAUTHORS:20140806-140527334
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48113
Deposited By: George Porter
Deposited On:06 Aug 2014 21:26
Last Modified:03 Oct 2019 07:00

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