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Surface-wave retrieval from generalized diffuse fields in 2D synthetic models of alluvial valleys

Marcela Baena-Rivera, Mathieu Perton and Francisco J. Sanchez-Sesma
Surface-wave retrieval from generalized diffuse fields in 2D synthetic models of alluvial valleys
Bulletin of the Seismological Society of America (September 2016) 106 (6): 2811-2816

Abstract

Among other methods, passive imaging technique is widely applied to obtain surface-wave velocities. This technique implies that the average cross correlations between diffuse wavefields recorded at two observers is proportional to the imaginary part of the Green's function. For this purpose, most applications rely on both seismic ambient noise and the coda of earthquakes. Instead, we use a generalized diffuse field (GDF), defined as the waves produced by a multiplicity of distant seismic sources. These wavefields undergo multiple scatterings along their way and at the local surface geology.In this communication, we use GDF to extract the locally generated surface waves in a 2D alluvial valley model for both inplane and antiplane cases from the retrieved Green's function. For the inplane case, an equipartitioned cocktail of plane P, SV, and Rayleigh waves is used, whereas for the antiplane case, the incidence is a set of plane SH waves. In addition to isotropic illumination, we explore the partial illumination from one side of the valley. In both cases, we obtain dispersion curves for the Rayleigh and Love waves' group velocities from the retrieved Green's functions and found good agreement with the exact result for the fundamental modes of both Love and Rayleigh waves in an infinite horizontal layer.This theoretical validation is a proof of concept within an ongoing project whose goal is to improve the characterization of Mexico City subsoil throughout tomography maps of surface-wave velocities using a collection of historical strong earthquakes recorded by the Mexico City Accelerometric Network.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 106
Serial Issue: 6
Title: Surface-wave retrieval from generalized diffuse fields in 2D synthetic models of alluvial valleys
Affiliation: Universidad Nacional Autonoma de Mexico, Instituto de Ingenieria, Coyoacan, Mexico
Pages: 2811-2816
Published: 20160927
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 30
Accession Number: 2016-092858
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N19°25'00" - N19°25'00", W99°10'00" - W99°10'00"
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: 201645
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