Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (17) Citing Articles via Google Scholar Google Scholar Articles by Wu, R.-S. Articles by Xie, X.-B. Search for Related Content GeoRef GeoRef Citation

Seismic Wave Propagation and Scattering in Heterogeneous Crustal Waveguides Using Screen Propagators: I SH Waves

Institute of Tectonics
University of California
Santa Cruz, California 95064
wrs{at}es.ucsc.edu

Manuscript received 21 July 1999.

The great advantages of one-way propagation methods, such as the generalized screen propagators (GSP) method, are the fast speed of computation, often several orders of magnitude faster than the full-wave finite difference and finite element methods, and the huge savings in internal memory. In this article, a half-space GSP is formulated for the SH half-space problem. Two versions of the half-space GSP are derived: the wide-angle pseudo-screen and the phase-screen. The Moho discontinuity is treated as parameter perturbations from the crustal background. The validity and limitations of this treatment are discussed. It is shown that half-space screen propagators can accurately propagate guided crustal waves that are composed of small-angle waves with respect to the horizontal direction. Comparisons of numerical results with a wavenumber integration method for flat crustal models and a finite difference algorithm for heterogeneous models show excellent agreements. For a model with propagation distance of 250 km, dominant frequency at 0.5 Hz, the GSP method is about 300 times faster than a finite difference algorithm with a similar accuracy. These comparisons demonstrate the accuracy and efficiency of the method. We apply our method to simulate regional wave propagation in different types of complex crustal waveguides including those with small-scale random heterogeneities. The influence of these heterogeneities on Lg amplitude attenuation and Lg coda formation is significant.

This article has been cited by other articles:

				W. Sun, L.-Y. Fu, and R.-S. Wu 2.5D SH Wave Propagation in Heterogeneous Crustal Wave Guides Using the Phase Screen Method Bulletin of the Seismological Society of America, October 1, 2008; 98(5): 2391 - 2401. [Abstract] [Full Text] [PDF]

				Y. He, X.-B. Xie, and T. Lay Explosion-Source Energy Partitioning and Lg-Wave Excitation: Contributions of Free-Surface Scattering Bulletin of the Seismological Society of America, April 1, 2008; 98(2): 778 - 792. [Abstract] [Full Text] [PDF]

				H. Li, I. B. Morozov, and S. B. Smithson Correlation of Lg Amplitude Ratios from Peaceful Nuclear Explosions to Crustal Structure in Northern Eurasia Bulletin of the Seismological Society of America, April 1, 2007; 97(2): 426 - 439. [Abstract] [Full Text] [PDF]

				L.-Y. Fu Comparison of Different One-Way Propagators for Wave Forward Propagation in Heterogeneous Crustal Wave Guides Bulletin of the Seismological Society of America, June 1, 2006; 96(3): 1091 - 1113. [Abstract] [Full Text] [PDF]

				X.-B. Xie, Z. Ge, and T. Lay Investigating Explosion Source Energy Partitioning and Lg-Wave Excitation Using a Finite-Difference plus Slowness Analysis Method Bulletin of the Seismological Society of America, December 1, 2005; 95(6): 2412 - 2427. [Abstract] [Full Text] [PDF]

				Z. Ge, L.-Y. Fu, and R.-S. Wu P-SV Wave-Field Connection Technique for Regional Wave Propagation Simulation Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1375 - 1386. [Abstract] [Full Text] [PDF]

				S. Hartzell, M. Guatteri, P. M. Mai, P.-C. Liu, and M. Fisk Calculation of Broadband Time Histories of Ground Motion, Part II: Kinematic and Dynamic Modeling Using Theoretical Green's Functions and Comparison with the 1994 Northridge Earthquake Bulletin of the Seismological Society of America, April 1, 2005; 95(2): 614 - 645. [Abstract] [Full Text] [PDF]

				Scattering Attenuation of 2D Elastic Waves: Theory and Numerical Modeling Using a Wavelet-Based Method Bulletin of the Seismological Society of America, April 1, 2003; 93(2): 922 - 938.

				Simulating the Envelope of Scalar Waves in 2D Random Media Having Power-Law Spectra of Velocity Fluctuation Bulletin of the Seismological Society of America, February 1, 2003; 93(1): 240 - 252.

				Energy Partition and Attenuation of Regional Phases by Random Free Surface Bulletin of the Seismological Society of America, June 1, 2002; 92(5): 1992 - 2007.