2014 Fiscal Year Final Research Report
Verification of Velocity structures estimation in a irregular subsurface structure using the microtremor H/V spectral method
| Project/Area Number |
23560670
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
ARAI Hirotoshi 国土技術政策総合研究所, 建築研究部, 主任研究官 (40302947)
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Keywords | 強震動予測 / 地下構造推定 / ３次元モデル / 微動 / 水平・上下動スペクトル比 / 差分法 / 大阪堆積盆地 |
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| Outline of Final Research Achievements |
Beyond the traditional framework of the 1-D velocity structure, the horizontal-to-vertical spectral ratio (HVSR) of microseisms, derived from full-wave field in a three-dimensional topographical model (the Osaka sedimentary basin) was produced by finite differential method (FDM)-based simulation.
The FDM simulations confirmed the phenomena such as the polarization of the peak amplitude of the HVSRs in grabens and step structures in the sediment-bedrock interface. In addition, it was showed that the features of the peak frequency, the peak value and the shape of HVSRs in areas with strong irregularities in the sediment-bedrock interface are different from those of the HVSR estimation based on the 1-D velocity structure model.
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| Free Research Field |
工学・建築学・建築構造・材料・地震防災
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