11:45 AM - 12:00 PM
[SSS13-11] Near-surface geophysical survey and hearing survey of housing damages at Yasunaga district, Mashiki Town stricken by the 2016 Kumamoto Earthquakes
Keywords:2016 Kumamoto Earthquakes, Mashiki Town, Yasunaga District, near surface geophysics, housing damage survey
No specific deformed structure or faulting structure was identified in the near surfaces along the survey line set in the Yasunaga District. In contrast, a thick soft layer characterized as low resistivity and low Vs occupied the surfaces up to 20 m deep at the southern half of the line, or Akitsu lowland area. The above evidences strongly suggest that surface deformed structure observed in the Yasunaga District was originated by non-tectonic forces influenced by local artificial topography and the existence of the soft layer instead of active faulting. Our survey results also demonstrate the importance of high-resolution near-surface geophysical surveying and direct interviewing to the residents for the detailed undestanding of local earthquake disasters.