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発表 2016年熊本地震被災地益城町安永地区での浅部物理探査および建物被害調査

作成年度 2018 年度
論文名 2016年熊本地震被災地益城町安永地区での浅部物理探査および建物被害調査
論文名(和訳)
論文副題
発表会 日本地震学会2018年度秋季大会
誌名 日本地震学会講演予稿集 2018年度秋季大会
巻・号・回
発表年月日 2018/10/09 ~ 2018/10/11
所属研究室/機関名 著者名(英名)
土木研究所 地質・地盤研究グループ稲崎 富士
土木研究所 地質・地盤研究グループ小河原 敬徳
土木研究所 地質・地盤研究グループ木佐貫 寛
土木研究所 地質・地盤研究グループ尾西 恭亮
TK海陸北 高穂
抄録
We conducted a detailed near-surface geophysical survey and hearing survey of housing damages at Yasunaga District, Mashiki Town stricken by the 2016 Kumamoto Earthquakes. The geophysical survey comprised “Hybrid Surface Wave Survey” (HSWS), capacitively coupled resistivity (CCR) measurement, and GPR. A 350 m long short survey line was deployed along a road between Route 28 and Akitsu River. Hearing survey was also conducted along the survey line. We directly interviewed with residents in May 2018, or indirectly inspected housing sites. Both resistivity and S-wave velocity sections delineated a thick low resistivity and low Vs layer occupied the surfaces at the southern half of the line, or Akitsu lowland area. A total of 31 dwellings were surveyed supported by board members of the Yasunaga District community. The hearing was quite helpful to understand local anomalies of ground failure caused by the Earthquakes. The survey results strongly suggested that surface failures occurred in Yasunaga District mainly resulted from non-tectonic deformations.
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