| Budget Amount *help |
¥35,620,000 (Direct Cost: ¥27,400,000、Indirect Cost: ¥8,220,000)
Fiscal Year 2014: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2012: ¥25,090,000 (Direct Cost: ¥19,300,000、Indirect Cost: ¥5,790,000)
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| Outline of Final Research Achievements |
In order to reveal the mechanism of the 2011 Tohoku Oki earthquake and subsequent post-seismic deformation of the northeastern Japan, we have conducted deformation experiments of a wide variety of rocks composing subduction zones. By the friction experiments using gas rig, frictional stability of quartz gouge is observed to be correlated to energy ratio of the gouge controlled by internal structure of gouges. Moreover, rupture velocity of serpentinites and olivine gouges depends on the their frictional coefficients and normal stress, implying that the slow slip in subduction zones illuminates the stress state of the plate boundary. By the shear experiments using Griggs rig, deformation mechanisms and creep strengths of feldspars are significantly reduced by the presence of water added externally into the samples under the lower crustal condition. We also proposed rheological models of the NE Japan island arc-trench systems and plate boundary causing the 2011 Tohoku Oki earthquake.
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