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| Abstract | Seismic velocity structure is investigated in the landslide site, Tozawa area, Yurihonjo city, south Akita Prefecture. The survey area consists colluvial soil landslide that second order and it have moved repeatedly. The survey length was 72m. S- and P- wave survey was made along the same line. An improved reverse stack was applied in S-wave analysis so as to improve S/N ratio. Seismic velocity structure model was constructed through forward modeling of ray tracing. The ray tracing program SEIS88 is used. As the result of S wave result, averages of the S wave velocity were 113.4(m/s) for the first layer, and 395.5(m/s) for the second layer. And P wave result, averages of the P wave velocity were 120~160(m/s) for the first layer, and 690~730(m/s) for the second layer. Landslide plane can be the second boundary or a hidden boundary in the best velocity model. |
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