Station-to-Station Green's Functions Extracted From Seismic Coda in Southern California
Abstract
It has been demonstrated recently that correlation of seismic diffuse field (ambient noise and coda) recorded at two stations leads to deterministic station-to-station Green's functions. The theory requires a homogeneous distribution of uncorrelated sources or scatters. However, this condition is not satisfied by the ambient noise data, which is dominated by the microseisms. In this study, we will explore the seismic coda recorded in southern California for over 10 years. In contrary to ambient seismic noise, coda waves, generated by multiple scattering by small-scale heterogeneities, are independent of the sources that generate them. The Green's function extracted from coda waves should approach more closely to the true Green's functions. These Green's functions will provide a way to quantify the bias in these two different data sets. We will also explore the frequency content and amplitude of coda-wave Green's functions and compare them with numerical Green's functions based on the current Community Velocity Models of southern California.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.S51C2244H
- Keywords:
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- 7200 SEISMOLOGY