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Rayleigh-wave multipathing along the West Coast of North America

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


We have created a movie of surface ground motion for the 3 November 2002 Denali fault earthquake based on 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.

ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 95
Serial Issue: 6
Title: Rayleigh-wave multipathing along the West Coast of North America
Affiliation: California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Pages: 2115-2124
Published: 200512
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 21
Accession Number: 2006-019241
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N42°00'00" - N46°19'60", W124°34'60" - W116°34'60"
N32°00'00" - N65°00'00", W155°00'00" - W103°00'00"
Secondary Affiliation: University of California at Santa Barbara, USA, United StatesJapan Agency for Marine Earth Science and Technology, JPN, JapanUniversite de Pau et des Pays de l'Adour, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200610
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