Title: RESEARCH ON SOURCE RUPTURE PROCESS OF M_S6.6 EARTHQUAKE OF JUNE 30,2012,IN THE BORDER AREA OF XINYUAN AND HEJING COUNTY,XINJIANG
Abstract:By using the digital teleseismic seismograms recorded by the global network( IRIS),we studied the rupture process of the MS6. 6 earthquake of Jun. 30,2012,in the border area between Xinyuan and Hejing...By using the digital teleseismic seismograms recorded by the global network( IRIS),we studied the rupture process of the MS6. 6 earthquake of Jun. 30,2012,in the border area between Xinyuan and Hejing Counties. In addition,based on the tectonic feature of the eastern segment of Kashi River Fault and regional stress state in the central segment of Tienshan region before the MS6. 6 earthquake,we discussed the possible seismogenic mechanism of the MS6. 6 earthquake. The result indicates that the lasting time of the MS6. 6 earthquake's rupture process is about 35 s and the main energy release appears in the early 16 s. The total rupture process consists of two sub-events,strength of the first rupture is higher than the second one. The rupture process is relatively simple and has bilateral rupture characteristics; the maximum slip amount is 45. 0cm. The initial rupture point of the MS6. 6earthquake locates on the verge of high slip amount area,the dislocation mode of main rupture area in the depth is reverse and right-lateral strike-slip type,and the one in the shallow is mainly right-lateral strike-slip type; MS≥3. 0 aftershocks are mainly distributed on the verge of high slip amount area or high gradient area of slip amount change; the feature of focal mechanisms of those aftershocks occurring within the short time after the mainshock is consistent with the slip vector distribution on the fault surface; The mid-strong earthquakes with reverse fault type taking place before the MS6. 6earthquake had increased obviously in Xinjiang area,especially in the central segment of Tienshan area,and the azimuth and plunge of P axis of these earthquakes are consistent with the regional stress field. This suggests to a certain extent that the central segment of Tienshan area is more under the control of the tectonic stress field,which may promote the right-lateral strike-slip motion on the rightlateral wrench faulting eastern segment of the Kashi River Fault. And this may be the generating mechanism of the MS6. 6 earthquake.Read More
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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