HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by FRANKEL, A. Articles by CLAYTON, R. W. Search for Related Content GeoRef GeoRef Citation

A finite-difference simulation of wave propagation in two-dimensional random media

SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA 91125

Abstract

A finite-difference algorithm is used to generate synthetic seismograms for waves propagating through two-dimensional random media. The media have a significant component of their material properties varying randomly over length scales smaller than the seismic wavelength and are meant to approximate the heterogeneity of the crust and upper mantle. The finite-difference technique retains all multiply scattered and diffracted waves, and also accounts for transmission losses.

The synthetic seismograms clearly exhibit coda and apparent attenuation caused by scattering. For a medium with a white wavenumber spectrum of velocity fluctuations, the coda is higher frequency than the initial pulse. The apparent attenuation is greatest when the scatterer size is comparable to the seismic wavelength. The spectra of the coda generally increase in frequency as the scatterers decrease in size. Examples demonstrate how scattering can produce spectra with broad peaks and sharp fall-offs that can make the determination of the source spectra and corner frequencies of small earthquakes extremely difficult.

Footnotes

^* Present address: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109.

This article has been cited by other articles:

				R. W. Graves The Seismic Response of the San Bernardino Basin Region during the 2001 Big Bear Lake Earthquake Bulletin of the Seismological Society of America, February 1, 2008; 98(1): 241 - 252. [Abstract] [Full Text] [PDF]

				R. W. Graves, A. Pitarka, and P. G. Somerville Ground-motion amplification in the Santa Monica area: Effects of shallow basin-edge structure Bulletin of the Seismological Society of America, October 1, 1998; 88(5): 1224 - 1242. [Abstract] [PDF]

				H. Chang and G. A. McMechan Numerical simulation of multi-parameter seismic scattering Bulletin of the Seismological Society of America, December 1, 1996; 86(6): 1820 - 1829. [Abstract] [PDF]

				D. HELMBERGER, D. DREGER, R. STEAD, and H. KANAMORI Impact of broadband seismology on the understanding of strong motions Bulletin of the Seismological Society of America, June 1, 1993; 83(3): 830 - 850. [Abstract] [PDF]

				R. H. CLOUSER and C. A. LANGSTON QP-QS relations in a sedimentary basin using converted phases Bulletin of the Seismological Society of America, June 1, 1991; 81(3): 733 - 750. [Abstract] [PDF]

				A. FRANKEL and L. WENNERBERG Microearthquake spectra from the Anza, California, seismic network: Site response and source scaling Bulletin of the Seismological Society of America, June 1, 1989; 79(3): 581 - 609. [Abstract] [PDF]

				A. JIN and K. AKI Spatial and temporal correlation between coda Q and seismicity in China Bulletin of the Seismological Society of America, April 1, 1988; 78(2): 741 - 769. [Abstract] [PDF]

				A. M. DAINTY, R. M. DUCKWORTH, and A. TIE Attenuation and backscattering from local coda Bulletin of the Seismological Society of America, October 1, 1987; 77(5): 1728 - 1747. [Abstract] [PDF]

				A. FRANKEL and L. WENNERBERG Energy-flux model of seismic coda: Separation of scattering and intrinsic attenuation Bulletin of the Seismological Society of America, August 1, 1987; 77(4): 1223 - 1251. [Abstract] [PDF]

				T. LAY Analysis of near-source contributions to early P-wave coda for underground explosions. II. Frequency dependence Bulletin of the Seismological Society of America, August 1, 1987; 77(4): 1252 - 1273. [Abstract] [PDF]

				A. BAYLISS, K. E. JORDAN, B. J. LEMESURIER, and E. TURKEL A fourth-order accurate finite-difference scheme for the computation of elastic waves Bulletin of the Seismological Society of America, August 1, 1986; 76(4): 1115 - 1132. [Abstract] [PDF]

				E. CRANSWICK, R. WETMILLER, and J. BOATWRIGHT High-frequency observations and source parameters of microearthquakes recorded at hard-rock sites Bulletin of the Seismological Society of America, December 1, 1985; 75(6): 1535 - 1567. [Abstract] [PDF]

				A. R. LEVANDER Use of the telegraphy equation to improve absorbing boundary efficiency for fourth-order acoustic wave finite difference schemes Bulletin of the Seismological Society of America, December 1, 1985; 75(6): 1847 - 1852. [PDF]

				A. R. LEVANDER and N. R. HILL P-SV resonances in irregular low-velocity surface layers Bulletin of the Seismological Society of America, June 1, 1985; 75(3): 847 - 864. [Abstract] [PDF]

				Z. DER, T. MCELFRESH, R. WAGNER, and J. BURNETTI Spectral characteristics of P waves from nuclear explosions and yield estimation Bulletin of the Seismological Society of America, April 1, 1985; 75(2): 379 - 390. [Abstract] [PDF]