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Rayleigh-wave multi-pathing along the west coast of North America

Ji, Chen and Tsuboi, Seiji and Komatitsch, Dimitri and Tromp, Jeroen (2005) Rayleigh-wave multi-pathing along the west coast of North America. Bulletin of the Seismological Society of America, 95 (6). pp. 2115-2124. ISSN 0037-1106.

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We have created a movie of surface ground motions for the November 3, 2002, Denali fault earthquake based upon spectral-element simulations using crustal model CRUST2.0, mantle model S20RTS, topography and bathymetry model ETOPO5, and a finite-fault slip model. The movie features two anomalous wave packets that travel along the west coast of the North American plate following off-great-circle paths. These wave packets are Rayleigh waves with dominant periods around 20 sec, which are also found in seismograms recorded by the Southern California Seismic Network. One of these packets is the direct surface wave, whose group arrival-time changes laterally as dictated by the shape of the Oregon coast. The other packet is a surface wave reflected by a lateral interface underneath the Rocky Mountains. A linear reflector parallel to the Canadian coast offsetting it by a few hundred kilometers can explain its arrival time, but the offsetting distance derived from the synthetic seismograms puts the reflector 350 km northeast of the result obtained from the data, indicating a need to update the crustal and mantle models in this area.

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Additional Information:© 2005 Seismological Society of America. We thank Hiroo Kanamori for help in calculating the phase velocity map. This research was supported in part by USGS grant # 04HQGR0048 and by the Gordon and Betty Moore Foundation. Seismic data were obtained from the Southern California Earthquake Data Center. The computations were performed at the Earth Simulator Center of JAMSTEC by Seiji Tsuboi. The figures were created with the Generic Mapping Tools [Wessel and Smith, 1998]. This is Caltech Seismological Laboratory contribution #9090 and Caltech Tectonic Observatory contribution #4.
Group:Caltech Tectonics Observatory
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:algorithms; bathymetry; California; crust; Denali Fault; earthquakes; elastic waves; geophysical methods; ground motion; guided waves; mantle; North America; Oregon; polarization; Rayleigh waves; reflection methods; refraction methods; Rocky Mountains; seismic methods; seismic waves; seismograms; simulation; Southern California; surface waves; United States; velocity structure; vertical-gradient methods
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Caltech Seismological Laboratory 9090
Caltech Tectonics Observatory 4
Record Number:CaltechAUTHORS:20110119-134624900
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Official Citation:Chen Ji, Seiji Tsuboi, Dimitri Komatitsch, and Jeroen Tromp Rayleigh-wave multipathing along the West Coast of North America Bulletin of the Seismological Society of America (December 2005), 95(6):2115-2124
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21818
Deposited By: Tony Diaz
Deposited On:03 Feb 2011 17:47
Last Modified:26 Dec 2012 12:51

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