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《Earth Science(Journal of China University of Geosciences)》 2009-04
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Coulomb Stress Accumulation along Haiyuan Fault Zone

CUI Du-xin,HU Ya-xuan,WANG Wen-ping,ZHU Gui-zhi No.2 Monitoring Center of China Earthquake Administration,Xi'an 710054,China  
We caculate Coulomb stress accumulation rate and moment accumulation rate through inversing Haiyuan fault slipping rates and locking depths by using a Fourier solution of 3D body force model with constrains of CMONOC and GPS profiles data.Genetic algorithm has been applied to simulate the GPS velocity field.The last fitting rms residual is 1.2 mm/a.The result reveals that the slip rate of left lateral of Maomao Shan fault is 3.6 mm/a,and 22.2 km for the locking depth.For Laohushan,its slip rate is 10.5 mm/a and 11.4 km for locking depth.The slip rate in western segment,middle segment and eastern segment of Haiyuan fault(in narrow sense)is respectively 3.5 mm/a,5.8 mm/a and 5.7 mm/a,and 8.5 km,3.6 km and 4.3 km for the locking depth.The Coulomb stress accumulation rates are 0.48~1.59 MPa/100 a along Haiyuan fault zone.The Coulomb stress accumulation rate is large but the moment accumulation rate is small in Maomaoshan fault.In Laohushan fault both the Coulomb stress accumulation rate and moment accumulation rate are large.The Coulomb stress accumulation rates in the middle and western segments of Haiyuan fault(in narrow sense)are largest in all segments.
【Fund】: 国家自然科学基金项目(No.40674057);; 中国地震科学基金(No.A07132)
【CateGory Index】: P738.4
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