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Seismic-Hazard Analysis of Long-Period Ground Motion of Megathrust Earthquakes in the Nankai Trough Based on 3D Finite-Difference Simulation
https://nied-repo.bosai.go.jp/records/5351
https://nied-repo.bosai.go.jp/records/53518b90a5cd-e0d6-425f-a46c-082955c82acc
| Item type | researchmap(1) | |||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||
| タイトル | ||||||||||||||||
| 言語 | en | |||||||||||||||
| タイトル | Seismic-Hazard Analysis of Long-Period Ground Motion of Megathrust Earthquakes in the Nankai Trough Based on 3D Finite-Difference Simulation | |||||||||||||||
| 言語 | ||||||||||||||||
| 言語 | eng | |||||||||||||||
| 著者 |
Takahiro Maeda
× Takahiro Maeda
× Asako Iwaki
× Nobuyuki Morikawa
× Shin Aoi
× Hiroyuki Fujiwara
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| 抄録 | ||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||
| 内容記述 | The 3D wave propagation simulation is suitable for the long-period ground-motion hazard analysis, because the realistic seismic source and velocity structure models are applicable and ground motion at any point can be obtained. However, large-scale simulations for various scenarios are needed to adopt uncertainty due to the source model of a large earthquake. Here we show our approach to overcome a problem of heavy computational expense. We improve computation performance of the 3D finite-difference method by using discontinuous grids and by adapting to multigraphics processing units technique. Then, we simulate long-period ground motion of many scenarios of a hypothetical megathrust earthquake in the Nankai trough. We use the characterized source models based on the "recipe" in the simulation. Finally, we apply the simulation results based on about 400 scenarios to a technical framework of the probabilistic seismic-hazard analysis. The hazard maps of velocity response spectra for a given conditional exceedance probability show that the long-period ground motion is more significant with respect to the underground structure than is the distance from the source area. | |||||||||||||||
| 言語 | en | |||||||||||||||
| 書誌情報 |
en : SEISMOLOGICAL RESEARCH LETTERS 巻 87, 号 6, p. 1265-1273 |
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| 出版者 | ||||||||||||||||
| 言語 | en | |||||||||||||||
| 出版者 | SEISMOLOGICAL SOC AMER | |||||||||||||||
| ISSN | ||||||||||||||||
| 収録物識別子タイプ | EISSN | |||||||||||||||
| 収録物識別子 | 1938-2057 | |||||||||||||||
| DOI | ||||||||||||||||
| 関連識別子 | 10.1785/0220160093 | |||||||||||||||
