Epicentral Location Based on Rayleigh Wave Empirical Green's Functions from Ambient Seismic Noise

Record section of the Composite Empirical Green's Functions compared with the earth- quake records at 20 remote stations for Event on in Northern California. (a) Envelope functions of the earthquake observed at the remote stations (red lines) are compared with envelopes of the Composite EGFs (blue lines). Band-pass: 7-15 sec period. Epicentral distances and station names are indicated at left. (b) Locations of the remote stations (blue triangles) and the earthquake (red star).
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A new method to locate the epicenter of regional seismic events is developed with strengths and limitations complementary to existing location methods. This new technique is based on applying Empirical Green's Functions (EGFs) for Rayleigh waves between 7 and 15 sec period that are determined by cross-correlation of ambient noise time-series recorded at pairs of seismic receivers. The important advantage of this method, in comparison with standard procedures based on use of body wave travel times, is that it does not employ an earth model. Rather it is based on interpolating the EGFs to arbitrary hypothetical event locations. The method is tested by locating well known "Ground Truth" crustal events in the western US as well as locating seismic stations using the principal of reciprocity. Data from the EarthScope/ USArray Transportable Array as well as regional networks were used for location. In these applications, location errors average less than 1 km, but are expected to vary with event mechanism and depth.
</p><p>References
</p><p>Barmin, M.P., A.L. Levshin, Y. Yang, and M.H. Ritzwoller, 2010. Epicentral Location Based on Rayleigh Wave Empirical Green's Functions from Ambient Seismic Noise. Submitted to Geophys. J. Int.
</p><p>Acknowledgements: This research was supported by DoE/NNSA contract DE-AC52-09NA29326</p>

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