Estimation of 1-D velocity models beneath strong-motion observation sites in the Kathmandu Valley using strong-motion records from moderate-sized earthquakes

• 資料種別: 記事
• タイトル: Estimation of 1-D velocity models beneath strong-motion observation sites in the Kathmandu Valley using strong-motion records from moderate-sized earthquakes
• 著者・編者: Subeg M. Bijukchhen; Nobuo Takai; Michiko Shigefuji
• 出版事項: 日本 : Springer Nature
• 出版年月日等: 2017-07-24
• 出版年（W3CDTF）: 2017-07-24
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 69(97)
• 掲載巻: 69(97)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-017-0685-4; https://doi.org/10.1186/s40623-017-0685-4
• 国立国会図書館永続的識別子: info:ndljp/pid/10953825; https://dl.ndl.go.jp/pid/10953825
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• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2017-09-14T21:01:06+09:00
• 保存日（W3CDTF）: 2017-09-12
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• 掲載誌（URI）: https://earth-planets-space.springeropen.com/articles?searchType=journalSearch&sort=PubDate&page=2
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• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: The Himalayan collision zone experiences many seismic activities with large earthquakes occurring at certain time intervals. The damming of the proto-Bagmati River as a result of rapid mountain-building processes created a lake in the Kathmandu Valley that eventually dried out, leaving thick unconsolidated lacustrine deposits. Previous stud-ies have shown that the sediments are ~600 m thick in the center. A location in a seismically active region, and the possible amplification of seismic waves due to thick sediments, have made Kathmandu Valley seismically vulnerable. It has suffered devastation due to earthquakes several times in the past. The development of the Kathmandu Valley into the largest urban agglomerate in Nepal has exposed a large population to seismic hazards. This vulnerability was apparent during the Gorkha Earthquake (Mw7.8) on April 25, 2015, when the main shock and ensuing aftershocks claimed more than 1700 lives and nearly 13% of buildings inside the valley were completely damaged. Preparing safe and up-to-date building codes to reduce seismic risk requires a thorough study of ground motion amplification. Characterizing subsurface velocity structure is a step toward achieving that goal. We used the records from an array of strong-motion accelerometers installed by Hokkaido University and Tribhuvan University to construct 1-D velocity models of station sites by forward modeling of low-frequency S-waves. Filtered records (0.1–0.5 Hz) from one of the accelerometers installed at a rock site during a moderate-sized (mb4.9) earthquake on August 30, 2013, and three moderate-sized (Mw5.1, Mw5.1, and Mw5.5) aftershocks of the 2015 Gorkha Earthquake were used as input motion for modeling of low-frequency S-waves. We consulted available geological maps, cross-sections, and borehole data as the basis for initial models for the sediment sites. This study shows that the basin has an undulating topography and sediment sites have deposits of varying thicknesses, from 155 to 440m. These models also show high velocity contrast at the bedrock depth which results in significant wave amplification.
• DOI: 10.1186/s40623-017-0685-4; https://doi.org/10.1186/s40623-017-0685-4
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: Creative Commons Attribution 4.0 International
• 関連情報（URI）: https://hdl.handle.net/2115/66867; http://id.ndl.go.jp/digimeta/10953825; https://dl.ndl.go.jp/pid/10953825; http://link.springer.com/article/10.1186/s40623-017-0685-4/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-017-0685-4.pdf; http://hdl.handle.net/2115/66867
• 参照: Examination of shallow and deep S-wave velocity structures from microtremor array measurements and receiver function analysis at strong-motion stations in Kathmandu basin, Nepal; https://cir.nii.ac.jp/crid/1050306506449935744; Ground motion prediction equation for the Kathmandu Valley, Nepal based on strong motion records during the 2015 Gorkha Nepal earthquake sequence; https://cir.nii.ac.jp/crid/1050869456405222272; Strong‐Motion Characteristics and Visual Damage Assessment Around Seismic Stations in Kathmandu after the 2015 Gorkha, Nepal, Earthquake; https://cir.nii.ac.jp/crid/1050869456407281152; Strong ground motion data of the 2015 Gorkha Nepal earthquake sequence in the Kathmandu Valley; https://cir.nii.ac.jp/crid/1360580229812818944; Rayleigh波位相速度と群速度の同時逆解析による浅部～深部地盤のS波速度構造の推定; https://cir.nii.ac.jp/crid/1390564227310867072
• 参照: Aftershock activity of the 2015 Gorkha, Nepal, earthquake determined using the Kathmandu strong motion seismographic array; https://cir.nii.ac.jp/crid/1050306506455246592; Strong ground motion in the Kathmandu Valley during the 2015 Gorkha, Nepal, earthquake; https://cir.nii.ac.jp/crid/1050869456408682240; Characterizing the Kathmandu Valley sediment response through strong motion recordings of the 2015 Gorkha earthquake sequence; https://cir.nii.ac.jp/crid/1360004232523476480; Geological database for liquefaction hazard analysis in the Kathmandu valley, Nepal; https://cir.nii.ac.jp/crid/1360016870106537088; Basement topography of the Kathmandu Basin using microtremor observation; https://cir.nii.ac.jp/crid/1360283691021131008; Initiatives for earthquake disaster risk management in the Kathmandu Valley; https://cir.nii.ac.jp/crid/1360285706391529472; Application of Horizontal-to-Vertical Spectral Ratios of Earthquake Ground Motions to Identify Subsurface Structures at and around the K-NET Site in Tohoku, Japan; https://cir.nii.ac.jp/crid/1360285713167347200; Validation of the Deep Velocity Structure of the Tokachi Basin Based on 3-D Simulation of Long-Period Ground Motions; https://cir.nii.ac.jp/crid/1360292620795119488; Generic Mapping Tools: Improved Version Released; https://cir.nii.ac.jp/crid/1360574092886026112; Seismicity and one‐dimensional velocity structure of the Himalayan collision zone: Earthquakes in the crust and upper mantle; https://cir.nii.ac.jp/crid/1361418520307542272; Active folding of fluvial terraces across the Siwaliks Hills, Himalayas of central Nepal; https://cir.nii.ac.jp/crid/1361418520943936000; Sediment thickness beneath the Indo-Gangetic Plain and Siwalik Himalaya inferred from receiver function modelling; https://cir.nii.ac.jp/crid/1361699995159773056; A study of local amplification effect of soil layers on ground motion in the Kathmandu Valley using microtremor analysis; https://cir.nii.ac.jp/crid/1361981471325936896; Tuning the deep velocity structure model by 1-D simulation of long-period S-waves; https://cir.nii.ac.jp/crid/1362544419970736256; Primary surface ruptures of the great Himalayan earthquakes in 1934 and 1255; https://cir.nii.ac.jp/crid/1362544420295524224; 3D Viscoelastic Wave Propagation in the Upper Borrego Valley, California, Constrained by Borehole and Surface Data; https://cir.nii.ac.jp/crid/1362544421153107840; The Optimal Use of Horizontal-to-Vertical Spectral Ratios of Earthquake Motions for Velocity Inversions Based on Diffuse-Field Theory for Plane Waves; https://cir.nii.ac.jp/crid/1362825895114149376; Changes in the depositional system of the Paleo-Kathmandu Lake caused by uplift of the Nepal Lesser Himalayas; https://cir.nii.ac.jp/crid/1363388845799128448; Paleoclimatic changes during the last 2.5 myr recorded in the Kathmandu Basin, Central Nepal Himalayas; https://cir.nii.ac.jp/crid/1363951794334104064; ネパール・カトマンズ盆地の基盤地形; https://cir.nii.ac.jp/crid/1390001204093810304; Analysis of strong ground motions and site effects at Kantipath, Kathmandu, from 2015 Mw 7.8 Gorkha, Nepal, earthquake and its aftershocks; https://cir.nii.ac.jp/crid/2050588892145976832
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
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• 書誌ID（NDLBibID）: 10953825; http://id.ndl.go.jp/bib/10953825
• NII論文ID: 120006329030