| 講演要旨(和文) | | 2015年4月25日，ネパール・ゴルカ地震（Mw7.8）が発生し，全壊家屋は80万棟を越える家屋が全壊した．地震直後から5度にわたり現地調査を実施しカトマンズ盆地内全域の被害調査を実施した．被害建物の多くは，カトマンズでは無補強レンガ壁の鉄筋コンクリート骨組造（RCIW）である．周期4秒の長周期地震動の卓越が見られた地点を通る微動観測の測線に沿って実施した被害調査では構造物の被害状況がこの長周期の卓越との相関は認められなかった．そこで，被害集中地域に着目して単点微動観測や極小微動アレー観測と表面波探査を実施した．被害状況と地盤のせん断波構造を比較した。 |
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| | 講演要旨(英文) | | Nepal Ghorka earthquake (Mw 7.8) occurred on April 25, 2015, and over 800,000 houses were destroyed. Immediately after the earthquake, field surveys were conducted five times to grasp the damage situation in the entire Kathmandu Valley. Most of the damaged buildings are reinforced concrete infilled walls (RCIW)typein Kathmandu. In the damage survey conductedalong the microtremor observation line passing through the point where the long period ground motion with a period of 4 seconds was prominent, no correlation was found between the damage status of the structure and this long period superiority. Therefore,we focused on single point tremor observation, microtremor array observation and surface wave exploration focusing on the damage concentration area. The damage condition and the shear wave structure of the ground were compared. |
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