Development of a method to monitor an active fault and its application to estimate fault parameters

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Seismometers were deployed at a vault across the Yasutomi Faultthat is one of the five fault segments of the Yamasaki Fault zone, above which the freeway goes along a strike of the fault, and the traffic noise was continuously recorded at a high sampling rate. Estimates of surface wave and body wave propagations between the stations were probably extracted from the records by use of seismic interferometry method. The result suggests the possibility that continuous observation of trafficnoise may be able to estimate the subsurface structure of the fault zone.