Vidale, John and Helmberger, Donald V. and Clayton, Robert W.
Finite-difference seismograms for SH waves.
Bulletin of the Seismological Society of America, 75
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The accuracy of the finite-difference method for generating synthetic seismograms of SH wave propagation in cylindrically symmetric media is discussed. The finite-difference method has the advantage that arbitrary density and velocity fields in the medium may be specified. A point source is generated by a simple transformation of a line source. The accuracy of the finite-difference seismograms in flat- and dipping-layered media is confirmed by comparison with the generalized ray method. A source radiation pattern is inserted by introducing a “near-field” which has permanent displacement near the source.
Strong motion synthetics are constructed with this new method for the 1968 Borrego Mountain earthquake as recorded at El Centro. Good fits to the data are achieved using the laterally varying model determined by a detailed refraction survey and the source parameters determined by teleseismic waveform modeling. Shallow faulting is no longer necessary to explain the long-period surface-wave development.
|Additional Information:||© 1985 by the Seismological Society of America. Manuscript received 25 March 1985. This work was partly supported by Air Force-Cambridge Grant F19628-83-K-0010. J. E. V. was supported by an NSF Fellowship. Art Frankel aided in the development of the FD program. We thank Heidi Houston and an anonymous reviewer for their suggestions. |
|Funding Agency||Grant Number|
|NSF Graduate Research Fellowship||UNSPECIFIED|
|Other Numbering System:|
|Other Numbering System Name||Other Numbering System ID|
|Caltech Seismological Laboratory||4015|
|Official Citation:||John Vidale,
Donald V. Helmberger,
and Robert W. Clayton
Finite-difference seismograms for SH waves
Bulletin of the Seismological Society of America, December 1985, v. 75, p. 1765-1782 |
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited On:||17 Oct 2012 18:11|
|Last Modified:||31 Jan 2017 21:45|
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