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| | Abstract | | Seismic interferometry is an imaging method of subsurface structures using passive seismic records without artificial energy sources. Imaging of deep crustal structures and plate boundaries is expected, using natural earthquake records. We applied the auto- and cross-correlation analysis to deep earthquake records, acquired by a wide-aperture linear seismometer array called Tokai Array, temporarily deployed in 2008 to image the P- and S-wave seismic structures under the Tokai region. The result of auto-correlation analysis shows good agreement with previous research results in the area, such as seismic tomography and receiver function (Kato et al., 2010, Takaoka et al., 2012). P- and S-wave reflection profiles show reflectors corresponding to continental Moho and subducting Philippine Sea plate boundary. Discontinuity of reflectors is also found at the interface of geological structure such as MTL in shallow part. Then we applied the cross-correlation analysis to S-wave records. The current result of cross-correlation analysis shows strong reflectors, however, the reflectors were imaged shallower than those in auto-correlation analysis and the seismic structure estimated in Kato et al. (2010). |
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