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Earthquake Centroid Locations Using Calibration from Ambient Seismic Noise

Zhan, Zhongwen and Wei, Shengji and Ni, Sidao and Helmberger, Don (2011) Earthquake Centroid Locations Using Calibration from Ambient Seismic Noise. Bulletin of the Seismological Society of America, 101 (3). pp. 1438-1445. ISSN 0037-1106. doi:10.1785/0120100118.

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Earthquakes occur in complex geology, making it difficult to determine their source parameters and locations because of uncertainty in path effects. We can avoid some of these problems by applying the cut-and-paste (CAP) method, which allows for timing shifts between phases, assuming a 1D model, and determines source parameters. If the travel times or lags of the phases due to path effects are known relative to a reference model, we can locate the events’ centroid with surface waves without knowledge of the 3D velocity structure. Here, we use ambient seismic noise for such a calibration. We cross correlate the seismic stations near the earthquake with stations 100–300 km away to obtain the 10–100-s surface wave Green’s functions. The new method is tested in southern California to locate the 2008 Chino Hills earthquake, which proves consistent with the epicenter location from P waves. It appears possible to use the location offset between the high-frequency P-wave onset relative to the centroid to provide a fast estimate of directivity.

Item Type:Article
Related URLs:
URLURL TypeDescription
Zhan, Zhongwen0000-0002-5586-2607
Ni, Sidao0000-0003-2988-4850
Additional Information:© 2011 Seismological Society of America. Manuscript received 28 April 2010. Two anonymous reviewers and the editor provided helpful comments to improve the article. This work was supported by USGS NEHRP grant G10AP00048, NSFC 40821160549, CAS KZCX2-YW-116-1, and CEA program 200808078, 200708035. California Institute of Technology Seismological Laboratory contribution 10057.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
National Natural Science Foundation of China40821160549
Chinese Academy of SciencesKZCX2-YW-116-1
China Earthquake Administration200808078
China Earthquake Administration200708035
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Seismological Laboratory10057
Issue or Number:3
Record Number:CaltechAUTHORS:20110613-103703524
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Official Citation:Zhan, Zhongwen, Wei, Shengji, Ni, Sidao, Helmberger, Don Earthquake Centroid Locations Using Calibration from Ambient Seismic Noise Bulletin of the Seismological Society of America 2011 101: 1438-1445
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23986
Deposited By: Ruth Sustaita
Deposited On:13 Jun 2011 18:08
Last Modified:09 Nov 2021 16:19

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