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《Progress in Geophysics》 2013-03
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The effect of Tohoku M_W 9.0 earthquake on the near-field seismic activity from the coseismic and postseismic deformation

SUN Yu-jun1,DONG Shu-wen2,FAN Tao-yuan1,ZHANG Si-qi3, ZHANG Huai3,SHI Yao-lin3*(1.Key Laboratory of Neotectonic Movement & Geohazard of Chinese Ministry of Land and Resources, Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China; 2.Chinese Academy of Geological Sciences,Bejing 100037,China; 3.Key laboratory of Computational Geodynamics,Chinese Academy of Sciences,Beijing 100049,China)  
After the occurrence of 2011 Tohoku MW 9.0 earthquake,there have been many reports that a strong earthquake maybe occur in Nankai Trough in the future.Does the Tohoku earthquake impact on the seismic activity of Nankai Trough fault? In this paper,with the viscoelastic half-space model,we calculated the coseismic and postseismic deformation and Coulomb stress change of many faults in the Japanese archipelago.The results show that: in the 5 km,the 2011 Tohoku MW 9.0 earthquake makes the coseismic Coulomb stress of thrust faults paralleling to the Japan Trench release more than 50 kPa,which is equivalent to the stress accumulation of 5~50 years.While for the thrust faults in the Japanese archipelago paralleling to the Nankai Trough,the coseismic Coulomb stress increase by 1 kPa,which is equivalent to 0.1~1 years stress accumulation on the case of tectonic movement.For the strike-slip faults,if the sliding direction of the fault is the same with the coseismic displacement,the Coulomb stress will increase,and vice versa.For instance,the Coulomb stress in the fault of 1948 Fukui earthquake increase 10 kPa and the seismic risk is increase significantly.The effect of asthenospheric viscosity on the post-deformation is investigated.We find that the displacement and Coulomb stress will be further increase for most of the faults in the postseismic phase.Therefore,the seismic risk of the thrust fault paralleling to the Nankai Trough and many strike-slip faults whose sliding direction agrees with coseismic displacement,will be enhanced in the future.
【Fund】: 中央级公益性科研院所基本科研业务费项目(DZLXJK201205);; 国家自然科学基金(41204066);; 深部探测技术与实验研究专项(SinoProbe-08-01 SinoProbe-07)联合支助
【CateGory Index】: P315
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