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Shear-wave vibrational directions and related fault movements in Southern California Earthquakes

Dehlinger, Peter (1952) Shear-wave vibrational directions and related fault movements in Southern California Earthquakes. Bulletin of the Seismological Society of America, 42 (2). pp. 155-173. ISSN 0037-1106.

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Vibrational directions of direct shear waves from a number of small local earthquakes in southern California, recorded at Pasadena and Riverside, are determined and related to corresponding faulting at the source. A theoretical relationship between wave vibrational directions and fault displacements is proposed. Directions of SV and SH motions from various fault types are adduced from this relationship. Observations of initial shear wave motions indicate generally consistent SH displacements, usually less consistent SV displacements, and ratios of SV/SH which usually vary widely. Polarization of SH waves is indicated; that of SV wave, suggested. The entire shear wave is probably approximately plane-polarized. The results of this study indicate that horizontal components of faulting in southern California usually follow the same general direction, whereas vertical fault components appear to vary in direction. Comparison of observed SV and SH motions with (1) theoretical shear motions and (2) Gutenberg's (1941) observations of compressional wave impulses, provides analysis of faulting at the source. Seismic data and regional surface geology indicate a fault pattern involving, primarily, northwesterly-trending right-handed transcurrent faults in some parts of southern California, approximately east-west-trending reverse or thrust faults in other parts, and the coexistence of the two in a few localities. Simplified stress distributions in agreement with the data are discussed briefly.

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Additional Information:Copyright © 1952, by the Seismological Society of America. This paper is a summary of a doctoral dissertation in geophysics at the California Institute of Technology. The original manuscript is available at the Institute Library. Manuscript received for publication July 5, 1950. The writer wishes to express his sincere appreciation to Dr. B. Gutenberg, who suggested this problem and supervised this work, and to Drs. H. Benioff and C. F. Richter for many valuable suggestions.
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Caltech Division of Geological Sciences546
Issue or Number:2
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48080
Deposited By: George Porter
Deposited On:06 Aug 2014 20:59
Last Modified:03 Oct 2019 07:00

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