What determines the critical slip distance of the fault?

• Project/Area Number: 21840022
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Tokyo
• Principal Investigator: KUWANO Osamu The University of Tokyo, 地震研究所, 特任研究員 (30511969)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2010: ¥533,000 (Direct Cost: ¥410,000、Indirect Cost: ¥123,000); Fiscal Year 2009: ¥1,157,000 (Direct Cost: ¥890,000、Indirect Cost: ¥267,000)
• Keywords: 粉体 / 摩擦 / 断層 / 地震 / 室内実験

Research Abstract

The frictional properties of granular matter are important for analyzing various phenomena in geosciences. Here we conduct an experiment on the deformation-rate dependence of the kinetic friction coefficient, which determines the stability of granular flow. By changing the deformation rate over four orders of magnitude, we find the characteristic rate at which the least friction is realized. The result does not depend on the shape of the grains. The least friction is explained in terms of the competition between two very different physical processes, namely frictional healing and anelasticity. We determine the expression of the characteristic rate.

Research Products

• [Presentation] 粉体生成による高速すべり領域での速度弱化摩擦から速度強化摩擦への遷移 (2011)
  • Author(s): 桑野修,波多野恭弘
  • Organizer: 日本地球惑星科学連合2011年大会
  • Place of Presentation: 千葉
  • Year and Date: 2011-05-24
• [Presentation] Strengthening of fault at seismic slip rate caused by gouge formation (2010)
  • Author(s): O. Kuwano, T. Hatano
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco CA, USA
  • Year and Date: 2010-12-13
• [Presentation] Strengthening of fault at seismic slip rate caused by gouge formation (2010)
  • Author(s): Osamu Kuwano
  • Organizer: American Geophysical Union, Fall Meeting 2010
  • Place of Presentation: Moscone Convention Center, San Francisco, California, USA
  • Year and Date: 2010-12-13
• [Presentation] Granular friction in a wide range of shear rate, Franco-Japanese Joint Seminar Deformation (2010)
  • Author(s): O. Kuwano
  • Organizer: Flow and Rupture of Soft Matter
  • Place of Presentation: Ecole Normale Superieure de Lyon, Lyon, France
  • Year and Date: 2010-07-07
• [Presentation] Granular friction in a wide range of shear rate (2010)
  • Author(s): Osamu Kuwano
  • Organizer: Franco-Japanese Joint Seminar Deformation, Flow and Rupture of Soft Matter
  • Place of Presentation: Ecole Normale Superieurede Lyon, Lyon, France
  • Year and Date: 2010-07-07
• [Presentation] Transition from velocity weakening to strong velocity strengthening friction in dense granular shear experiments (2009)
  • Author(s): O. Kuwano, R. Ando, T. Hatano
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco CA, USA
  • Year and Date: 2009-12-18
• [Presentation] Transition from velocity weakening to strong velocity strengthening friction in dense granular shear experiments (2009)
  • Author(s): 桑野修
  • Organizer: American Geophysical Union, Fall Meeting 2009
  • Place of Presentation: Moscone Convention Center, San Francisco, California, USA
  • Year and Date: 2009-12-18
• [Presentation] 粉体層の高速摩擦実験 (2009)
  • Author(s): 桑野修,安藤亮輔,波多野恭弘
  • Organizer: 日本地震学会2009年秋季大会
  • Place of Presentation: 京都
  • Year and Date: 2009-10-21
• [Presentation] 粉体層の高速摩擦実験 (2009)
  • Author(s): 桑野修
  • Organizer: 日本地震学会2009年秋季大会
  • Place of Presentation: 京都大学(京都府)
  • Year and Date: 2009-10-21
• [Presentation] 粉体層の高速摩擦実験 (2009)
  • Author(s): 桑野修
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張メッセ国際会議場(千葉県)
  • Year and Date: 2009-05-18