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Seismic evidence for the tectonics of Central and Western Asia

Scheidegger, A. E. (1959) Seismic evidence for the tectonics of Central and Western Asia. Bulletin of the Seismological Society of America, 49 (4). pp. 369-378. ISSN 0037-1106.

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A statistical analysis of the null axes of the fault-plane solutions of earthquakes in any one area permits determination of the average tectonic motion direction of that area. In the present paper this method has been applied to areas in central and western Asia for which several hundred fault-plane solutions are readily available in the literature. The investigation yields the result that (seismically) calculated tectonic motion directions in a series of small areas that are part of a larger unit are consistent with each other and that there is in every case an excellent correlation with the tectonic motion of the area as postulated from geological studies. This appears to justify completely the seismic method. The seismically determined tectonic motion in central Asia appears to be mainly in a north-south direction. The motion refers to the present time (since the earthquakes occur at the present time), but it is the same as that postulated in geology for an explanation of the folding of the central Asian mountain ranges. This demonstrates that the stress system which created the central Asian mountains is active at the present time.

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Additional Information:Copyright © 1959, by the Seismological Society of America. Manuscript received for publication April 9, 1959. The writer is indebted to R. P. Sharp and F. Press for the invitation to spend half a year as a visitor at the Seismological Laboratory of the California Institute of Technology. This enabled him to continue his seismological research. Discussions of the subject matter of this paper with C. F. Richter and G. W. Potapenko have been extremely helpful. Last, but not least, without the availability to the writer of the computing facilities at the California Institute of Technology this study would not have been possible.
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Caltech Division of Geological Sciences930
Issue or Number:4
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48121
Deposited By: George Porter
Deposited On:06 Aug 2014 22:00
Last Modified:03 Oct 2019 07:00

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