| Project/Area Number |
24654144
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
WATADA Shingo 東京大学, 地震研究所, 助教 (30301112)
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| Co-Investigator(Renkei-kenkyūsha) |
IMANISHI Yuichi 東京大学, 地震研究所, 准教授 (30260516)
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| Research Collaborator |
MURAYAMA Takahiko
ARAI Nobuo
IWAKUNI Makiko
NOGAMI Maki
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 津波 / 2011年太平洋東北沖地震 / 2010年チリ地震 / 津波伝播速度低下伝播速度低下 / 初期反転位相 / 津波シミュレーションシミュレーション / 遠地津波波形 / DART / 2014年チリ地震 / 津波シミュレーション / 津波到達遅延 / 津波波形インバージョン / 断層滑り分布 / 太平洋東北沖地震 / 東日本大震災 / チリ地震 / 津波速度低下 / 津波初期反転位相 / 気圧波生成 / 大気波動伝播 / 圧力波 / 大気境界波 |
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| Outline of Final Research Achievements |
Tsunami traveltime delays up to 15 min relative to the simulated long waves from the 2010 Chilean and 2011 Tohoku-Oki earthquakes were observed. Small negative phases before the main peak were found at distant locations. Measured tsunami phase velocities show reverse dispersions at periods beyond 1000 s and are consistent with a tsunami mode coupled with a self-gravitating elastic Earth, suggesting that the effects of compressible seawater, elastic sea-bottom deformation, and gravity variations during tsunami propagation are responsible for the traveltime delays and the initial negative phases. A new method to simulate tsunami waveforms on real ocean bathymetry that takes into account the three effects was developed. The simulated waveforms reproduce the observed waveforms, including a small negative phase at distant locations. The traveltime difference between the observed and simulated waveforms has decreased to less than 5 min and the waveform difference remarkably diminishes.
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