Study of scattering property in the crust using the autocorrelation function of ambient seismic noises

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Scattered seismic waves provide much information about a subterranean heterogeneous structure. If we can obtain waves which are radiated from a source, back scattered, and come back to the location of the source, they should be invaluable for the study. Equivalent signals can be retrieved by the autocorrelation function of ambient ground noise. We estimated quality factors Q_<ACF> of the signals derived from the noises for 26 stations in Izu-Oshima volcanic island, Japan. It is found that the signals mainly consist of back scattered surface waves. The resultant spatio-temporal distribution of Q_<ACF> of the island in a period, Aug. 2008-Jun. 2009, demonstrates that Q_<ACF> is a useful parameter to study the shallow heterogeneous structure in the crust.