Generation mechanism of slow slip-Effects of pore pressure

• Project/Area Number: 19540439
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Tokyo
• Principal Investigator: YAMASHITA Teruo The University of Tokyo, 地震研究所, 教授 (10114696)
• Research Collaborator: SUZUKI Takehito 東京大学, 地震研究所, 特任研究員 (10451874)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 地震現象 / スロースリップ / 間隙水圧 / 地震 / 多孔質弾性体 / 断層

Research Abstract

多孔質媒質を仮定し、さらに流体の移動を考慮に入れてスロースリップの発生機構を理論的・数値的に調べた。これによると、透水係数が異なる媒質境界に断層が存在する場合に、もっとも大規模な余効すべりが起こりうることがわかった。また、低周波地震などのいわゆるゆっくり地震は、摩擦発熱による流体圧の上昇と空隙生成に伴う流体圧の減少の間の相互作用および流体拡散により説明可能であることがわかった。

Research Products

• [Journal Article] Dynamic modeling of slow earthquakes based on thermoporoelastic effects and inelastic generation of pores (2009)
  • Author(s): Suzuki, T. and T.Yamashita
  • Journal Title: J. Geophys. Res (in press)
  • Peer Reviewed
• [Journal Article] Quasi-static fault slip on an interface between poroelastic media with different hydraulic diffusivity: a generation mechanism of afterslip (2009)
  • Author(s): Yamashita, T. and T. Suzuki
  • Journal Title: Journal of Geophysical Research 114
  • Peer Reviewed
• [Journal Article] Quasi-static fault slip on an interface between poroelastic media with different hydraulic diffusivity : a generation mechanism of afterslip (2008)
  • Author(s): Yamashita, T. and T.Suzuki
  • Journal Title: J. Geophys. Res B03405 Pages: 114-114
  • Peer Reviewed
• [Presentation] Fault bending promotes postseismic fault growth (2008)
  • Author(s): Yamashita, T.
  • Organizer: American Geophysical Union 2008 Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2008-12-18
• [Presentation] Slow Earthquakes Induced by Fluid Flow and Inelastic Pore Creation (2008)
  • Author(s): Suzuki, T.
  • Organizer: American Geophysical Union 2008 Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2008-12-18
• [Presentation] Fault bending promotes the postseismic fault growth (2008)
  • Author(s): 山下輝夫
  • Organizer: American Geophysical Union
  • Place of Presentation: アメリカ合衆国サンフランシスコ市
  • Year and Date: 2008-12-18
• [Presentation] Slow earthquakes induced by fluid flow and inelastic pore creation (2008)
  • Author(s): 鈴木岳人
  • Organizer: American Geophysical Union
  • Place of Presentation: アメリカ合衆国サンフランシスコ市
  • Year and Date: 2008-12-18
• [Presentation] Dynamic modeling of low-frequency earthquakes with fluid flow (2008)
  • Author(s): Suzuki, T.
  • Organizer: ASC-SSJ Fall meeting
  • Place of Presentation: Tsukuba
  • Year and Date: 2008-11-26
• [Presentation] 異種多孔性媒質境界での地震破壊-非地震性滑りのモデル化 (2008)
  • Author(s): 山下輝夫
  • Organizer: 日本地球惑星科学連合2008年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2008-05-30
• [Presentation] Quasistatic fault slip on an interface separating poroelastic media with different diffusivity (2007)
  • Author(s): Yamashita, T.
  • Organizer: American Geophysical Union 2007 Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2007-12-10
• [Presentation] Quasistatic fault slip on an interface separating poroelastic media with different diffusivity (2007)
  • Author(s): 山下輝夫
  • Organizer: American Geophysical Union
  • Place of Presentation: アメリカ合衆国サンフランシスコ市
  • Year and Date: 2007-12-10
• [Presentation] 異種多孔性媒質境界での準静的地震破壊-拡散率の違いの効果 (2007)
  • Author(s): 山下輝夫
  • Organizer: 日本地震学会2007年秋季大会
  • Place of Presentation: 仙台市
  • Year and Date: 2007-10-25
• [Presentation] 異種多孔性媒質境界での準静的地震破壊-拡散率の違いの効果 (2007)
  • Author(s): 山下輝夫
  • Organizer: 日本地震学会
  • Place of Presentation: 仙台市
  • Year and Date: 2007-10-25