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Bulletin of the Seismological Society of America; April 1949; v. 39; no. 2; p. 93-107
© 1949 Seismological Society of America
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The Walker Pass earthquakes and structure of the Southern Sierra Nevada*

S. K. CHAKRABARTY and C. F. RICHTER

CALIFORNIA INSTITUTE OF TECHNOLOGY,, PASADENA, CALIFORNIA

Abstract

The principal earthquake in the Walker Pass region on March 15, 1946, is located at Formula, at a depth of 22 km., with origin time at 05:49:35.9 P.S.T. Epicenters of aftershocks scatter about this, with some indication of a NNE-SSW trend. The observed times fit a structure with layers 21.7 km., 9.7 km., and 10.7 km. thick. Velocities of the longitudinal and transverse waves agree with those previously determined by Gutenberg for southern California. The effect of the "root" of the Sierra Nevada is seen in the failure of Pn to record at Tinemaha, although it appears there on the seismograms of shocks east and west of the principal group.

Footnotes

* Manuscript received for publication October 28, 1948.




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