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.
| 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 |
| 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 |
| Google Analytic Metrics | Metrics page |