| Project/Area Number |
25750143
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Natural disaster / Disaster prevention science
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MIYAKE Hiroe 東京大学, 大学院情報学環, 准教授 (90401265)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 地震動 / 超巨大地震 / 東北地方太平洋沖地震 / 震源 / 強震動予測 / ハザード |
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| Outline of Final Research Achievements |
Broadband source modeling for predicting ground motions is a key role for seismic hazard assessment. Recent megathrust earthquakes motivated us to establish a recipe for subduction earthquake scenarios. Based on slip inversions, scaling of source parameters and acceleration source spectral levels, we propose candidates for the broadband source of subduction earthquakes: Single-corner or double-corner characterized source models. The latter model, where the size and stress drop for short-period source patches are respectively 1/N times and N times of those for long-period source patches, worked to reproduce broadband ground motions for megathrust earthquakes. The short-period source patches partly superimpose on the long-period source patches for M8-class, then shift to the edge of the long-period source patches for M9-class earthquakes with increasing N value.
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