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| | Abstract | | Seismic interferometry synthesizes the pseudo-seismic response by cross-correlating the records observed at different receivers simultaneously. In this study, we applied the auto-correlation analysis of seismic interferometry to the natural earthquake records obtained during a seismic reflection survey. Our objective is to image the deep structure of faults and a plate boundary. The reflection survey was conducted across the Fujikawa-kako fault zone and the Itoigawa-Shizuoka Tectonic line in 2012. In this analysis, first, we applied the band pass filter to the seismic records and removed the traces with low S/N ratio. After we calculated the auto-correlation coefficients of the records, the pseudo-shot records were synthesized. Finally, we applied migration to the reflection record. In our result, deep structures such as the plate boundary were not well imaged. However, our result was consistent with the results of the reflection survey such as migrated section and tomography, and with the geological interpretation, although the survey was not necessarily suitable to observe natural earthquakes. This indicates that seismic interferometry (the auto-correlation analysis) has high potential to image subsurface structures. |
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