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Strong ground motion in the Kathmandu Valley during the 2015 Gorkha, Nepal, earthquake


EPS 2016 68(1).pdf759.94 kBPDF見る/開く
Additional file 1 KTP001504250611.dat606.78 kBDAT見る/開く
Additional file 2 TVU001504250611.dat606.81 kBDAT見る/開く
Additional file 3 PTN001504250611.dat606.8 kBDAT見る/開く
Additional file 4 THM001504250611.dat606.81 kBDAT見る/開く

タイトル: Strong ground motion in the Kathmandu Valley during the 2015 Gorkha, Nepal, earthquake
著者: Takai, Nobuo 著作を一覧する
Shigefuji, Michiko 著作を一覧する
Rajaure, Sudhir 著作を一覧する
Bijukchhen, Subeg 著作を一覧する
Ichiyanagi, Masayoshi 著作を一覧する
Dhital, Megh Raj 著作を一覧する
Sasatani, Tsutomu 著作を一覧する
キーワード: 2015 Gorkha Nepal earthquake
Kathmandu Valley
Strong ground motion
Velocity pulse motion
Valley response
発行日: 2016年 1月26日
出版者: Springer
誌名: Earth, Planets and Space
巻: 68
号: 1
開始ページ: 1
終了ページ: 8
出版社 DOI: 10.1186/s40623-016-0383-7
抄録: On 25 April 2015, a large earthquake of Mw 7.8 occurred along the Main Himalayan Thrust fault in central Nepal. It was caused by a collision of the Indian Plate beneath the Eurasian Plate. The epicenter was near the Gorkha region, 80 km northwest of Kathmandu, and the rupture propagated toward east from the epicentral region passing through the sediment-filled Kathmandu Valley. This event resulted in over 8000 fatalities, mostly in Kathmandu and the adjacent districts. We succeeded in observing strong ground motions at our four observation sites (one rock site and three sedimentary sites) in the Kathmandu Valley during this devastating earthquake. While the observed peak ground acceleration values were smaller than the predicted ones that were derived from the use of a ground motion prediction equation, the observed peak ground velocity values were slightly larger than the predicted ones. The ground velocities observed at the rock site (KTP) showed a simple velocity pulse, resulting in monotonic-step displacements associated with the permanent tectonic offset. The vertical ground velocities observed at the sedimentary sites had the same pulse motions that were observed at the rock site. In contrast, the horizontal ground velocities as well as accelerations observed at three sedimentary sites showed long duration with conspicuous long-period oscillations, due to the valley response. The horizontal valley response was characterized by large amplification (about 10) and prolonged oscillations. However, the predominant period and envelope shape of their oscillations differed from site to site, indicating a complicated basin structure. Finally, on the basis of the velocity response spectra, we show that the horizontal long-period oscillations on the sedimentary sites had enough destructive power to damage high-rise buildings with natural periods of 3 to 5 s.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 高井 伸雄


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