Theoretical study on seismic interferometry and its application to shallow subsurface exploration

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Multiple scattering waves have been often considered to be "noise" in seismology, and have been filtered out in the analysis of seismograms. However, benefit of multiple scattering waves for clarifying small-scale heterogeneities in the Earth is reappraised after the recent advent of seismic interferometry. In this study, we have been able to understand seismic interferometry in deeper depth. Based on our new findings, we have developed a method for exploring shallow subsurface velocity structures, and applied the method to real data successfully. Through these studies, we have been able to improve the applicability and usefulness of seismic interferometry and multiple scattering waves.