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Validating Accuracy of Rayleigh‐Wave Dispersion Extracted from Ambient Seismic Noise Via Comparison with Data from a Ground‐Truth Earthquake

Lookup NU author(s): Professor Zhenhong Li

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).

Abstract

In order to validate the accuracy of estimated Green’s functions (EGFs), which are widely used in ambient seismic noise tomography, a broadband seismograph was installed in the epicentral area of an M 5 earthquake, with ground‐truth location from Interferometric Synthetic Aperture Radar observations. EGFs between this station and permanent stations are compared with surface waves excited by the earthquake. The group velocity dispersion measured from EGFs at large interstation distances (∼1000 km or longer) are consistent with measurements from the earthquake, and the EGFs from symmetric noise correlation functions (NCFs) are usually more accurate. At shorter interstation distances (300–1000 km), the match between noise and earthquake dispersion is good for most stations, although we observed mismatch for a few stations. The mismatch is probably caused by low signal‐to‐noise ratio of NCFs or nondiffusive noise wavefield at short distances.

Publication metadata

Author(s): Bao F, Ni S, Xie J, Zeng X, Li Z, Li Z

Publication type: Article

Publication status: Published

Journal: Bulletin of the Seismological Society of America

Year: 2014

Volume: 104

Issue: 4

Pages: 2133-2141

Print publication date: 10/06/2014

Online publication date: 10/06/2014

Date deposited: 04/07/2014

ISSN (print): 0037-1106

ISSN (electronic): 1943-3573

Publisher: Seismological Society of America

URL: http://dx.doi.org/10.1785/0120130279

DOI: 10.1785/0120130279

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