2010 Fiscal Year Final Research Report
Validating detectability of Tokachi earthquake by assimilating earthquake cycle simulation into observational data
| Project/Area Number |
21710189
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Natural disaster science
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
ARIYOSHI Keisuke Japan Agency for Marine-Earth Science and Technology, 地震津波・防災研究プロジェクト, 技術研究副主任 (20436075)
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| Research Collaborator |
ARAKI Eiichirou 独立行政法人海洋研究開発機構, 地震津波・防災研究プロジェクト, 技術研究主任 (60359130)
HORI Takane 独立行政法人海洋研究開発機構, 地震津波・防災研究プロジェクト, 研究員 (00359176)
NAKATA Ryoko 独立行政法人海洋研究開発機構, 地震津波・防災研究プロジェクト, 特任技術研究副主任
HYODO Mamoru 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 研究員
AMPUERO Jean-Paul カリフォルニア工科大学パサディナ校, 准教授
KODERA Toru 日本海洋事業株式会社
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| Project Period (FY) |
2009 – 2010
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| Keywords | 自然災害 / 予測・分析・対策 / 海溝型巨大地震 |
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| Research Abstract |
I analyzed tilt meters on seafloor borehole far off Sanriku, northeastern Japan, before and after the 2003 Tokachi-oki earthquake. The analyzed data suggested that after-slip traveled 200 km far from the source region along trench for only two days. I succeeded in reproducing this phenomenon by 3-D numerical simulation, which suggested that pre-slip may be detected by installing borehole observation on a seafloor near the source region. Another simulation result also suggests that migration of low-frequency event may significantly change before a megathrust earthquake such as Tonankai.
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