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The effect of planar dipping structure on source and receiver responses for constant ray parameter

Langston, Charles A. (1977) The effect of planar dipping structure on source and receiver responses for constant ray parameter. Bulletin of the Seismological Society of America, 67 (4). pp. 1029-1050. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20140813-134652237

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Abstract

A geometrical ray method is developed for wave calculations involving three-dimensional planar dipping interfaces. Justification for the method is based on analogy with first-motion approximations derived from generalized ray theory where frequency dependence in the reflection-transmission coefficients is related to changes in the complex ray parameter. The method is applied to finding the teleseismic response of an arbitrarily oriented dislocation source in dipping layered media and for receiver calculations which assume an impinging P or S wave beneath a stack of dipping layers. Source results indicate that wave forms from fast azimuthally varying sources, such as strike-slip faults, are significantly distorted from the plane layered case for simple structures. A simple dipping Moho for dips up to 10° does not significantly distort vertical and radial P waves for the receiver response. However, due to azimuth anomalies introduced by interface dip a significant tangential P component is produced. In addition, the S-wave response becomes a function of source mechanism due to the need for specifying the incident polarization angle. Polarization studies are suggested for finding dipping structure.


Item Type:Article
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Additional Information:Copyright © 1977, by the Seismological Society of America. Manuscript received November 18, 1976. I would like to thank Don Helmberger and Christine Powell for their critical reviews of the manuscript and Laszlo Lenches for drafting the figures. This work was supported by National Science Foundation Grant EAR76-06619.
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NSFEAR76-06619
Record Number:CaltechAUTHORS:20140813-134652237
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140813-134652237
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48521
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Aug 2014 15:24
Last Modified:13 Feb 2019 18:06

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