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  1. 防災科研関係論文

Analysis of strong ground motions and site effects at Kantipath, Kathmandu, from 2015 Mw 7.8 Gorkha, Nepal, earthquake and its aftershocks

https://nied-repo.bosai.go.jp/records/3094
https://nied-repo.bosai.go.jp/records/3094
ce90f492-0636-4b25-a0de-549342fd3dc7
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Analysis of strong ground motions and site effects at Kantipath, Kathmandu, from 2015 Mw 7.8 Gorkha, Nepal, earthquake and its aftershocks
言語
言語 eng
著者 Yadab P. Dhakal

× Yadab P. Dhakal

en Yadab P. Dhakal

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Hisahiko Kubo

× Hisahiko Kubo

en Hisahiko Kubo

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Wataru Suzuki

× Wataru Suzuki

en Wataru Suzuki

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Takashi Kunugi

× Takashi Kunugi

en Takashi Kunugi

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Shin Aoi

× Shin Aoi

en Shin Aoi

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Hiroyuki Fujiwara

× Hiroyuki Fujiwara

en Hiroyuki Fujiwara

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抄録
内容記述タイプ Other
内容記述 Strong ground motions from the 2015 Mw 7.8 Gorkha, Nepal, earthquake and its eight aftershocks recorded by a strong-motion seismograph at Kantipath (KATNP), Kathmandu, were analyzed to assess the ground-motion characteristics and site effects at this location. Remarkably large elastic pseudo-velocity responses exceeding 300 cm/s at 5 % critical damping were calculated for the horizontal components of the mainshock recordings at peak periods of 4-5 s. Conversely, the short-period ground motions of the mainshock were relatively weak despite the proximity of the site to the source fault. The horizontal components of all large-magnitude (Mw >= 6.3) aftershock recordings showed peak pseudo-velocity responses at periods of 3-4 s. Ground-motion prediction equations (GMPEs) describing the Nepal Himalaya region have not yet been developed. A comparison of the observational data with GMPEs for Japan showed that with the exception of the peak ground acceleration (PGA) of the mainshock, the observed PGAs and peak ground velocities at the KATNP site are generally well described by the GMPEs for crustal and plate interface events. A comparison of the horizontal-to-vertical (H/V) spectral ratios for the S-waves of the mainshock and aftershock recordings suggested that the KATNP site experienced a considerable nonlinear site response, which resulted in the reduced amplitudes of short-period ground motions. The GMPEs were found to underestimate the response values at the peak periods (approximately 4-5 s) of the large-magnitude events. The deep subsurface velocity model of the Kathmandu basin has not been well investigated. Therefore, a one-dimensional velocity model was constructed for the deep sediments beneath the recording station based on an analysis of the H/V spectral ratios for S-wave coda from aftershock recordings, and it was revealed that the basin sediments strongly amplified the long-period components of the ground motions of the mainshock and large-magnitude aftershocks.
言語 en
書誌情報 en : EARTH PLANETS AND SPACE

巻 68, 号 58, 発行日 2016-04
出版者
言語 en
出版者 SPRINGER HEIDELBERG
ISSN
収録物識別子タイプ ISSN
収録物識別子 1880-5981
DOI
関連識別子 10.1186/s40623-016-0432-2
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