| Project/Area Number |
22654054
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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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) |
SATAKE Kenji 東京大学, 地震研究所, 教授 (20178685)
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| Project Period (FY) |
2010 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥2,930,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2010: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | 地震現象 / 津波 / 2011 年チリ地震 / 2012 年東北沖地震 / 伝播遅延 / 重力変化 / 東北沖地震 / スマトラ地震 / チリ地震 / 巨大地震 / ジオイド高変化 / 津波伝播時間の遅れ / 地殻変動 |
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| Research Abstract |
Geoid change by the mass re-distribution caused by the fault model of the 2010 Chilean earthquake is a few cm near the epicenter and not the cause of the large tsunamis. 20 min delay of the 2010 Chilean and the 2011 Tohoku-Oki earthquakes tsunami traveltime across the Pacific relative to the predicted time was due to anomalous dispersion of long-period tsunami caused by the compressibility of seawater, the elasticity of the solid earth, and the geo-potential change associated with mass motion during tsunami propagation. The computed tsunami waveform at distant locations taking into account the tsunami velocity reduction at long-period shows good agreement with the observed waveform and the traveltime delay has disappeared.
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