Wei, Shengji and Zhan, Zhongwen and Tan, Ying and Ni, Sidao and Helmberger, Don (2012) Locating earthquakes with surface waves and centroid moment tensor estimation. Journal of Geophysical Research B, 117 . Art. No. B04309. ISSN 0148-0227. doi:10.1029/2011JB008501. https://resolver.caltech.edu/CaltechAUTHORS:20120516-093035734
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Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20120516-093035734
Abstract
Traditionally, P wave arrival times have been used to locate regional earthquakes. In contrast, the travel times of surface waves dependent on source excitation and the source parameters and depth must be determined independently. Thus surface wave path delays need to be known before such data can be used for location. These delays can be estimated from previous earthquakes using the cut-and-paste technique, Ambient Seismic Noise tomography, and from 3D models. Taking the Chino Hills event as an example, we show consistency of path corrections for (>10 s) Love and Rayleigh waves to within about 1 s obtained from these methods. We then use these empirically derived delay maps to determine centroid locations of 138 Southern California moderate-sized (3.5 > M_w > 5.7) earthquakes using surface waves alone. It appears that these methods are capable of locating the main zone of rupture within a few (~3) km accuracy relative to Southern California Seismic Network locations with 5 stations that are well distributed in azimuth. We also address the timing accuracy required to resolve non-double-couple source parameters which trades-off with location with less than a km error required for a 10% Compensated Linear Vector Dipole resolution.
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Additional Information: | © 2012 by the American Geophysical Union. Received 6 May 2011; revised 5 March 2012; accepted 6 March 2012; published 20 April 2012. The authors are grateful to the two reviewers, whose comments have helped to improve the manuscript. We thank Carl Tape for generating the 3D synthetics and useful discussions about trade-offs of mechanisms and structure. This work was supported under the SCEC award 119938; USGS award G10AP00048; contribution 10043 of the Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology; and NSF of China fund 40821160549, 41074032. Seismic data used in this article were retrieved with the Seismic Transfer Program from Southern California Earthquake Data Center. Plots were made using the Generic Mapping Tools version 4.2.0. | ||||||||||
Group: | Seismological Laboratory | ||||||||||
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Subject Keywords: | Chino Hills earthquake; earthquake location; moment tensor; surface wave; tomography | ||||||||||
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DOI: | 10.1029/2011JB008501 | ||||||||||
Record Number: | CaltechAUTHORS:20120516-093035734 | ||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20120516-093035734 | ||||||||||
Official Citation: | Wei, S., Z. Zhan, Y. Tan, S. Ni, and D. Helmberger (2012), Locating earthquakes with surface waves and centroid moment tensor estimation, J. Geophys. Res., 117, B04309, doi:10.1029/2011JB008501 | ||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||
ID Code: | 31501 | ||||||||||
Collection: | CaltechAUTHORS | ||||||||||
Deposited By: | Tony Diaz | ||||||||||
Deposited On: | 22 May 2012 22:08 | ||||||||||
Last Modified: | 09 Nov 2021 19:54 |
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