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《Chinese Journal of Geophysics》 2015-01
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Focal mechanism and focal depth of the Gaoyou-Baoying,Jiangsu,China M_S4.9 earthquake on 20 July 2012 derived from moment tensor inversion

KANG Qing-Qing;MIAO Fa-Jun;LIU Hong-Gui;XU Ge;LI Feng;Earthquake Administration of Jiangsu Province;Institute of Geophysics,China Earthquake Administration;Institute of Earthquake Science,China Earthquake Administration;  
An MS4.9earthquake occurred in Gaoyou-Baoying,Jiangsu on 20 July 2012.This work determined its focal mechanism and depth through Time Domain Moment Tensor Inversion(TDMT-INV),and analyzed the stability and reliability of the results.Based on the 19 regional broadband seismometers′waveforms from Jiangsu,Anhui,Shandong and Zhejiang seismic networks,we accurately determined the location of the earthquake by theHypoDD first,and then calculated its focal mechanism and depth through TDMT_INV.And we compared this depth that obtained from picking up the sPn phase by patterning correlation coefficients in sliding windows.We tested the results through the following several procedures:1 Experiments by different crustal models and different epicenter location errors;2 Comparing with the result from the CAP method;3 P-wave first motions are projected onto the focal sphere;4 Forward modeling and inversion to research the factors of inversion instability.The nodal plane parameters of the best double-couple focal mechanism are as follows:strike290°,dip 88°and rake-21°;or strike 21°,dip 69°and rake-177°,Mw4.95 and focal depth is 7~9km.We calculated the focal depth by picking up sPn phase and got the 8.95 km result.The results include:1 All angles match well except one dip with 20°variation when we used the Crust2.0model instead of the IASP91 and hold the Q value unchanged.The results are nearly invariable if Q value changes by 100 and holding velocity and density constant.The maximum misalignment of the result is 6°when the epicenter varies within 5km.The result will deviate from the best solution while the epicenter varies by 10 km.2 The predominant focal depth is 8~10km by the CAP method.The results for 8km-focal depth are:strike 19°,dip 65°and rake-180°.3 There are 41 P-wave first motions projected onto the focal sphere,the ratio of inconsistent polarity is 7.3%,and all the contradictions are distributed around the nodal plane.4By forward modeling and inversion,while using the TDMT_INV method to invert the nearly pure strike-slip fault,we proved that the sign of slip will probably reverse if the station distribution concentrates on both ends of the field angle,the inversion results can properly return the forward model while the stations are distributed uniformly.In this case,it is hard to determine the accurate result through the evaluation parameters variance reduction(VR)and the variance divided by the percent double-couple(RES/Pdc).The TDMT_INV method is less dependent on the crustal model.The inversion results do not change much if the epicenter error is within 5km.The method has stability,but stations should surround the epicenter and are distributed uniformly as much as possible while inverting the near pure strike-slip fault.By comparing our results with field investigations after the earthquake(gravity measurement and seismic intensity distribution)and existing data of geological structure,we infer that the seismogenic structure for this event is the Yangchacang-Sangshutou fault,which is of right-lateral strike slip with a small normal component.
【Fund】: 中国地震局监测预报司测震台网青年骨干培养专项(20130206);; 地震科技星火计划项目(XH13007);; 江苏省地震局青年基金项目(201405)联合资助
【CateGory Index】: P315.33
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