NDLI: Refinements to the method of epicentral location based on surface waves from ambient seismic noise: introducing Love waves

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Refinements to the method of epicentral location based on surface waves from ambient seismic noise: introducing Love waves

Content Provider	Semantic Scholar
Author	Levshin, Anatoli L. Barmin, Mikhail P. Moschetti, Morgan P. Mendoza, Carlos I. Ritzwoller, Michael H.
Copyright Year	2012
Abstract	SUMMARY The purpose of this study is to develop and test a modification to a previous method of regional seismic event location based on Empirical Green's Functions (EGFs) produced from ambient seismic noise. Elastic EGFs between pairs of seismic stations are determined by cross-correlating long ambient noise time-series recorded at the two stations. The EGFs principally contain Rayleigh- and Love-wave energy on the vertical and transverse components, respectively, and we utilize these signals between about 5 and 12 s period. The previous method, based exclusively on Rayleigh waves, may yield biased epicentral locations for certain event types with hypocentral depths between 2 and 5 km. Here we present theoretical arguments that show how Love waves can be introduced to reduce or potentially eliminate the bias. We also present applications of Rayleigh- and Love-wave EGFs to locate 10 reference events in the western United States. The separate Rayleigh and Love epicentral locations and the joint locations using a combination of the two waves agree to within 1 km distance, on average, but confidence ellipses are smallest when both types of waves are used.
Starting Page	671
Ending Page	685
Page Count	15
File Format	PDF HTM / HTML
DOI	10.1111/j.1365-246X.2012.05631.x
Volume Number	191
Alternate Webpage(s)	http://ciei.colorado.edu/geophysics/pubs/mhrpubs/pubs/2012/j.1365-246X.2012.05631.x.pdf
Alternate Webpage(s)	http://ciei.colorado.edu/geophysics/pubs/mhrpubs/pubs/2012/Levshin_GJI_Apr_2012_wfigs.pdf
Alternate Webpage(s)	http://ciei.colorado.edu/pubs/2012/Levshin_GJI_Apr_2012_wfigs.pdf
Alternate Webpage(s)	http://ciei.colorado.edu/pubs/2012/j.1365-246X.2012.05631.x.pdf
Alternate Webpage(s)	https://doi.org/10.1111/j.1365-246X.2012.05631.x
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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