2019 Fiscal Year Final Research Report
Fundamental research on the ground structure and soil properties of Kathmandu Basin affecting damage during the 2015 Nepal Gorkha Earthquake
| Project/Area Number |
17H04498
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Natural disaster / Disaster prevention science
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| Research Institution | Ehime University |
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Principal Investigator |
Mori SHINICHIRO 愛媛大学, 理工学研究科(工学系), 准教授 (10304643)
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| Co-Investigator(Kenkyū-buntansha) |
山本 英和 岩手大学, 理工学部, 准教授 (00250639)
Bhandary NetraPrakash 愛媛大学, 社会共創学部, 教授 (10363251)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | カトマンズ盆地 / ネパール・ゴルカ地震 / 地震動増幅 / 被害集中域 / 建物被害 / 微動アレイ探査 / 表面波探査 / 軟弱層 |
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| Outline of Final Research Achievements |
Building damage in the capital's Kathmandu basin after the 2015 M7.8 Gorkha earthquake in Nepal The cause of this difference was investigated in terms of seismic motions. Single-point ground microtremors (300 locations) were used to create predominant period maps for three different types of ground Surface geological structure was estimated by conducting a survey.
In the Khusibu area, detailed planar distribution was obtained, and in the area where RC buildings were intensively damaged, Vs= The presence or absence of a thin ultra-soft layer of 100m/s (locally called Black Cotton Soil) It was found to be one of the factors that determined the building damage. The thin soft layer on the surface of the building is the main cause of the damage in Mashiki town, which was damaged in the Kumamoto earthquake. The parallels are interesting.
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| Free Research Field |
地震工学
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| Academic Significance and Societal Importance of the Research Achievements |
表層の超軟弱層の有無が建物の地震動による被害を大きくすることは、今後の日本の耐震性評価を考える上でも、国民が建物や家屋を建てる際にも注意すべき事項であり、土地の評価にも関わる重要な関心事となろう。
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