Understanding of slow and ordinary earthquakes in a single framework of modeling

• Project/Area Number: 21540429
• 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 東京大学, 地震研究所, 教授 (10114696)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 地震現象 / 非線形系 / 地震 / スロースリップ / 断層 / 多孔質媒質 / 微動 / 熱多孔質媒質 / 流体 / 摩擦 / 空隙

Research Abstract

We successfully simulate slow and ordinary earthquake in a single framework of modeling. It has become clear that key elements in the simulation are effects of fluid flow on fault slip and pore creation on the fault. We found that slower fault growth is obtained if we assume smaller permeabilities or larger pore creation rates. We also found that nonvolcanic tremor can be simulated if pore creation rate is large enough. Our calculation actually shows that fluid flow parallel to a fault must be assumed to simulate backward migration speeds of tremors on the order of 10-100km/h.

Research Products

• [Journal Article] Dynamic modeling of slow slip coupled with tremor (2011)
  • Author(s): Yamashita, T. and T. Suzuki
  • Journal Title: J. Geophys. Res Volume: 116 Issue: B5
  • DOI: 10.1029/2010jb008136
• [Journal Article] Nondimensional control parameters governing the behavior of 1-D fault slip : effects of shear heating, inelastic pore creation and fluid flow (2010)
  • Author(s): Suzuki, T. and T. Yamashita
  • Journal Title: J. Geophys. Res Volume: 115 Issue: B2
  • DOI: 10.1029/2009jb006557
• [Journal Article] Nondimensional control parameters governing the behavior of 1-D fault slip : effects of shear heating, inelastic pore creation and fluid flow (2010)
  • Author(s): Suzuki, T., T.Yamashita
  • Journal Title: Journal of Geophysical Research 115
  • Peer Reviewed
• [Presentation] Effects of fluid flow direction on the behavior of slow slip (2011)
  • Author(s): 山下輝夫
  • Organizer: Workshop on recent developments in seismic wave scattering and heterogeneities in the earth
  • Place of Presentation: 仙台市東北大学青葉記念会館
  • Year and Date: 2011-10-28
• [Presentation] Effects of fluid flow direction on the behavior of slow slip (2011)
  • Author(s): Teruo Yamashita
  • Organizer: Workshop on recent developments in seismic wave scattering and heterogeneities in the earth
  • Place of Presentation: 東北大学青葉記念会館(仙台市)
  • Year and Date: 2011-10-28
• [Presentation] スロースリップに対する透水係数の異方性の効果 (2011)
  • Author(s): 山下輝夫
  • Organizer: 日本地震学会
  • Place of Presentation: 静岡市静岡県コンベンションアーツセンター・グランシップ
  • Year and Date: 2011-10-14
• [Presentation] スロースリップに対する透水係数の異方性の効果 (2011)
  • Author(s): 山下輝夫
  • Organizer: 日本地震学会
  • Place of Presentation: 静岡県コンベンションアーツセンター・グランシップ(静岡市)
  • Year and Date: 2011-10-14
• [Presentation] Modeling of features of slow earthquakes in a dynamical framework (2010)
  • Author(s): 山下輝夫
  • Organizer: American Geophysical Union 2010 fall meeting
  • Place of Presentation: アメリカ合衆国サンフランシスコ市モスコーンセンター
  • Year and Date: 2010-12-14
• [Presentation] ゆっくり地震の諸特徴の動的枠組みでのモデル化 (2010)
  • Author(s): 山下輝夫
  • Organizer: 日本地震学会2010年度秋季大会
  • Place of Presentation: 広島市広島国際会議場
  • Year and Date: 2010-10-29
• [Presentation] ゆっくり地震の多様性の動的モデル化 (2010)
  • Author(s): 山下輝夫
  • Organizer: 日本地球惑星科学連合2010年度大会
  • Place of Presentation: 千葉市幕張メッセ国際会議場
  • Year and Date: 2010-05-28
• [Presentation] 動的地震破壊の統一的理解 (2009)
  • Author(s): 山下輝夫
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 幕張メッセ国際会議場
  • Year and Date: 2009-05-21