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| | Abstract | | Twice's earthquake on April 14, 2016 (M6.5) and April 16 (M7.3) occurred in Kumamoto-Pre. (2016 Kumamoto Earthquake).A lot of cracks occurred to Asodani by 2016 Kumamoto Earthquake. To grasp Asodani's subsurface structure, we put Micro Tremor Survey (SPAC Method) into effect. The quantity of Micro Tremor Survey are 6 pt/about 3 km in Uchinomaki area, 12pt/about 1 km in Kario area and 6 pt/about 800 m of Matoishi area. The S-wave velocity structure of the depth 500m was obtained as a result of Micro Tremor Survey. The dispersion curved line of surface wave was picked out by SPAC Method and the S-wave velocity structure was calculated by inverse analysis (genetic algorithm). Low-velocity zone (Vs300m/sec non-rise) exists in the upper part and the lower part, and high speed (than Vs300m/sec) exists in the middle.Low-velocity zone in the upper part was supposed with lacustrine sediment, and a high-speed zone was supposed with lava. |
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