| 講演要旨(和文) | | 2018年北海道胆振東部地震にて約100m離れたK,Kik強震観測点での強震記録が異なっているおり，この要因を解明するために，高密度微動観測，表面波探査，電気探査を実施した．大加速度が記録された2つの追分強震観測点を結ぶ測線で微動観測・表面波探査を実施して，測線上でのS波速度構造の変化を把握した．短周期帯域で速度応答の非常に大きかったKiK-net(IBUH01)観測点で微動H/Vスペクトルは低周波数側にピークを有しており，表面波探査の結果でも，周辺に低速度層が存在していることが分かった． |
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| | 講演要旨(英文) | | During the 2018 Hokkaido eastern Iburi earthquake, large peak ground acceleration was observed at the strong motion station IBUH01 and HKD127 at Oiwake district in Hayakita town, Hokkaido. These two stations are located only about 100 m distance in the same site, however, the feature of the response spectrum has large difference. This difference was caused by difference of the shallow underground velocity structure. We tried to grasp the variety of underground structure between these two stations using multi-channel surface wave method and microtremor observation. The detected soft soil deposit depth of IBUH01 is deeper than the one of HKD127. |
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