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《Chinese Journal of Geophysics》 2015-02
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Focal mechanisms and stress field of the Shangri-La Deqen,Yunnan Province—Derong,Sichuan Province M_S5.9 earthquake sequence in August,2013

LUO Jun;ZHAO Cui-Ping;ZHOU Lian-Qing;Institute of Geophysics,China Earthquake Administration;Key Laboratory of Earthquake Prediction,Institute of Earthquake Science,CEA;  
No MS5 earthquakes have been observed in the northwestern boundary of the Sichuan-Yunnan Block,the Jinshajiang fault and the Deqen-Zhongdian-Daju fault systems,since1976.The MS5.1earthquake and the MS5.9earthquake,which sequentially took place in Shangri-LaDeqen,Yunnan province-Derong Sichuan province on April 28 th,2013and April 31 th,2013,supplement apparent gaps of the focal mechanisms spatial distributions image of Sichuan-Yunnan Block boundary fault systems and also provide important date for further researches in terms of both faulting activities and tectonic stress field characteristics.Using digitally broadband seismic records,we determined focal mechanisms of 10 moderate earthquakes(MS4)in this MS5.9and MS5.1earthquake sequence.The focal mechanism solutions then supply data for the analyses of seismogenic fault activities and investigations of focal mechanisms and stress field characteristics in the Sichuan-Yunnan region.Regional broadband seismic records of China Seismograph Network were used to determine the focal mechanisms and focal depths of the MS5.9earthquake,MS5.1earthquake and other MS4events by the whole wave inversion method called the Cut-and-Paste method.The Focal Mechanism Stress Inversion method was introduced to estimate the local crust stress field of the source region.Combining our researches of focal mechanisms of moderate and large earthquakes in recent years with the geologic structures,aftershock distributions,intensity features and geodynamic backgrounds,we analyzed the characteristics of focal mechanisms and stress field of this earthquake sequence.The following results are obtained from focal mechanisms and stress field solutions of the MS5.9,MS5.1earthquake sequence:(1)The MS5.9earthquake and MS5.1earthquake are normal faulting events,so are other eight MS4aftershocks.Results show seismogenic fault is a northwest-west striking active fault.The fault solutions of the MS5.9and MS5.1earthquakes are strike 299°,dip 53°,rake-73°and strike 290°,dip 55°,rake-72°respectively.(2)Spatial distributions of T-axes and P-axes of the MS5.9 and MS5.1 events are exhibited similar,whereas,the orientations of these two axes of the Ms5.9aftershocks deviate from the ones of the main event in the following two days and relocate to the ones that are similar with the main event later,indicating an obvious stress readjustment process in the seismic source region.(3)The maximum principal axes(maximum compression)are perpendicularly oriented in northwestsoutheast and the minimum principal axes(minimum compression)are horizontally in northnortheast-south-southwest,leading to an obvious normal-faulting active region.These distributions are consistent with the trending of the surface maximum principal tensile stress field derived from the geodetic observations.(4)Combined our previous focal mechanisms determination,it can be concluded that the Shangri-La sub-block and the Baoshan sub-block are two interior regions in the Sichuan-Yunnan Block which are obviously under the normal-faulting regimes.However,the fault nodal planes and P-axes and T-axes strike differently in each boundary fault system.The orientations of nodal planes exhibit a clockwise rotation,with a gradual change from trending east-west in the northern section of the Jinshajiang fault and the middle section of the Litang fault to trending northwest-west in the Deqen-Zhongdian-Daju fault then to trending nearly northsouth in the southwestern section of the Lijiang-Xiaojinhe fault and the northern margin of the Baoshan sub-block.The T-axes are correspondingly oriented in north-south or north-northwest-southsoutheast further to northeast-southwest then to east-west or northeast-east-southwest-west,suggesting that stress states in these boundary faults are not consistent under the normal faulting regimes.In sum,this MS5.9,MS5.1earthquake sequence is an apparent normal-faulting sequence.The stress field of seismic source experienced distinct stress readjustments during the development process of the whole sequence.Solutions of focal mechanisms of the Sichuan-Yunnan region in recent years show that the Shangri-La sub-block and the Baoshan sub-block are primarily under normal faulting stress patterns which are dominated by the horizontally tensile stress field.Whilethe changes of the nodal planes and T-axes orientations in each boundary fault system indicate the existed influences of the sub-blocks interactions,terrain diversities under the background tectonic stress field.
【Fund】: 国家自然科学基金青年项目“基于三维介质衰减结构成像研究汶川8级地震震源环境及其与流体的关系”(41104033)和“芦山7级地震震源区及南北地震带中南段的地震学综合研究”(2013IES010104)共同资助
【CateGory Index】: P315.33
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