Modeling slip processes at the deeper part of the seismogenic zone using a constitutive law combining friction and flow laws

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概要

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• The fault zone in the earth's crust is thought to consist of several regions from top to bottom: the upper frictional region, the brittle-ductile transition zone and the ductile region. The upper frictional region consists of the unstable frictional zone, the unstable-stable transition zone, and the stable frictional zone. Recent geological observations of fault rock suggest that at the deeper part of the seismogenic zone, co-seismic frictional slip coexists with interseismic flow processes. We propose a possible model for slip processes at the deeper part of the seismogenic zone in which the frictional slip and flow processes are connected in series. In this model, in the ductile region, power law creep is dominant. Around the unstable-stable transition zone, we assume that co-seismic frictional slip coexists with aseismic flow processes. We investigate simple 1-D and 2-D models where rate- and state-dependent friction coexists with power law creep that has a threshold stress. The results of numerical simulations show that the amount of slip during the interseismic period is greater in the case where friction coexists with power law creep than it is when only friction is at work. It is also found that, for the case where friction coexists with power law creep, frictional slip is largely inhibited in the ductile region.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Horikawa Haruo

  Active Fault Research Center National Institute Of Advanced Industrial Science And Technology

• Tanaka Hidemi

  Department Of Earth And Planetary Science Graduate School Of Science The University Of Tokyo

• Iio Yoshihisa

  Research Center For Earthquake Prediction Disaster Prevention Research Institute Kyoto University

• Shibazaki Bunichiro

  International Institute For Seismology And Earthquake Engineering Building Research Institute

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