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Earth, Planets and Space

, Volume 56, Issue 12, pp 1087–1093 | Cite as

Modeling slips and nucleation processes at the deeper part of the seismogenic zone

  • Bunichiro Shibazaki
  • Norio Shigematsu
  • Hidemi Tanaka
Open Access
Article

Abstract

Important issues with regard to the generation processes of large inland earthquakes include how the stress concentrates and how nucleation starts in the deeper part of the seismogenic zone prior to the mainshock. We propose a model of earthquake generation processes that uses a constitutive law combining friction and flow processes. Using this law, we can represent fault behavior in which frictional slip coexists with flow processes at the frictional-viscous transition zone. We consider a limitted region where viscous deformation is high along the frictional-viscous transition zone, and investigate the role of this region in the nucleation process. During the interseismic period, slip velocity due to flow is much larger than frictional slip velocity in the region of low viscosity in the deeper part of the seismogenic zone. Large slip due to flow in this region is thought to cause stress to concentrate in the surrounding regions, and nucleation starts just above the low-viscosity region. Our numerical simulations indicate that the location of the nucleation process is determined by the nonuniform distribution of the depth of the frictional-viscous transition zone.

Key words

Nucleation process a constitutive law combining friction and flow frictional-viscous transition low-viscosity region 

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Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2004

Authors and Affiliations

  • Bunichiro Shibazaki
    • 1
  • Norio Shigematsu
    • 2
  • Hidemi Tanaka
    • 3
  1. 1.International Institute of Seismology and Earthquake EngineeringBuilding Research InstituteTsukubaJapan
  2. 2.Geological Survey of Japan, AISTAIST Tsukuba Central 7TsukubaJapan
  3. 3.Department of Earth and Planetary SciencesThe University of TokyoTokyoJapan

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