Refinements to the method of epicentral location based on surface waves from ambient seismic noise: introducing Love waves
Geophysical Journal International
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Abstract
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.
Suggested Citation
Levshin, A.L., Barmin, M.P., Moschetti, M.P., Mendoza, C., Ritzwoller, M.H., 2012, Refinements to the method of epicentral location based on surface waves from ambient seismic noise: introducing Love waves: Geophysical Journal International, 15 p., https://doi.org/10.1111/j.1365-246X.2012.05631.x.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Refinements to the method of epicentral location based on surface waves from ambient seismic noise: introducing Love waves |
| Series title | Geophysical Journal International |
| DOI | 10.1111/j.1365-246X.2012.05631.x |
| Publication Date | August 21, 2012 |
| Year Published | 2012 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | 15 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Journal International |
| Country | United States |