Phase velocities from seismic noise using beamforming and cross correlation in Costa Rica and Nicaragua
Phase velocities from seismic noise using beamforming and cross correlation in Costa Rica and Nicaragua
An expression for the cross correlation of noise between seismic stations and the 2D Green's function is derived assuming that noise travels as 2D surface waves. The phase velocity is obtained directly from the noise correlation function with a phase shift of +?/4. Mean phase velocity dispersion curves are calculated for the TUCAN seismic array in Costa Rica and Nicaragua from ambient seismic noise using two independent methods, noise cross correlation and beamforming. The noise cross correlation and beamforming methods are compared and contrasted by evaluating results from the TUCAN array. The results of the two methods as applied to the TUCAN array agree within 1%, giving good confidence in the phase velocities extracted from noise.
L19303
Harmon, Nicholas
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Gerstoft, Peter
7d4f935a-fbf2-48e2-bb65-7bde8635c33b
Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5
Abers, Geoffrey A.
d62949df-807e-43f5-ba83-28ef5d914184
Salas de La Cruz, Mariela
45476a4a-f0a0-48cd-b4e1-93796bfb395e
Fischer, Karen M.
5acb751d-c894-4a40-b944-cea48b0ad966
3 October 2008
Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Gerstoft, Peter
7d4f935a-fbf2-48e2-bb65-7bde8635c33b
Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5
Abers, Geoffrey A.
d62949df-807e-43f5-ba83-28ef5d914184
Salas de La Cruz, Mariela
45476a4a-f0a0-48cd-b4e1-93796bfb395e
Fischer, Karen M.
5acb751d-c894-4a40-b944-cea48b0ad966
Harmon, Nicholas, Gerstoft, Peter, Rychert, Catherine A., Abers, Geoffrey A., Salas de La Cruz, Mariela and Fischer, Karen M.
(2008)
Phase velocities from seismic noise using beamforming and cross correlation in Costa Rica and Nicaragua.
Geophysical Research Letters, 35, .
(doi:10.1029/2008GL035387).
Abstract
An expression for the cross correlation of noise between seismic stations and the 2D Green's function is derived assuming that noise travels as 2D surface waves. The phase velocity is obtained directly from the noise correlation function with a phase shift of +?/4. Mean phase velocity dispersion curves are calculated for the TUCAN seismic array in Costa Rica and Nicaragua from ambient seismic noise using two independent methods, noise cross correlation and beamforming. The noise cross correlation and beamforming methods are compared and contrasted by evaluating results from the TUCAN array. The results of the two methods as applied to the TUCAN array agree within 1%, giving good confidence in the phase velocities extracted from noise.
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Published date: 3 October 2008
Organisations:
Ocean and Earth Science
Identifiers
Local EPrints ID: 66067
URI: http://eprints.soton.ac.uk/id/eprint/66067
ISSN: 0094-8276
PURE UUID: 503a0b23-2a8c-43ac-a80b-b5db13e994f6
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Date deposited: 27 Apr 2009
Last modified: 14 Mar 2024 02:55
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Contributors
Author:
Peter Gerstoft
Author:
Geoffrey A. Abers
Author:
Mariela Salas de La Cruz
Author:
Karen M. Fischer
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