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《Seismology and Geology》 2015-03
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SPATIAL-TEMPORAL CHARACTERISTICS OF THE FOCAL MECHANISM CONSISTENCY PARAMETER IN TIANSHAN( WITHIN CHINESE TERRITORY) SEISMIC ZONE

LI Jin;ZHOU Long-quan;LONG Hai-ying;NIE Xiao-hong;GUO Yin;Earthquake Administration of Xinjiang Uygur Autonomous Region;China Earthquake Networks Center;  
Based on 306 focal mechanism solutions of MS≥3. 5 earthquakes from 2003 to 2014 in Tianshan seismic zone,we divide the Tianshan seismic zone into grids of certain size and use multiple focal mechanism solutions around each grid node to do the stress tensor inversion,and then calculate the temporal and spatial distribution of the focal mechanism consistency parameter for each grid node. On this basis the stress state of the Tianshan seismic zone is analyzed and the relationship between temporal and spatial distribution of focal mechanism consistency parameter and strong earthquakes is discussed. The result shows that the principal compressive stress of Tianshan is quite similar to the former research result; the P axis of the whole Tianshan is mainly in NS direction and in NNE and NNW in localized areas. There is a corresponding relationship between the temporal-spatial distribution of the focal mechanism consistency parameter and the strong earthquakes; strong earthquakes in the middle-east area of Tianshan Mountains often occur in the low value zones of focal mechanism consistency parameter or near the edge of the zones. Since the second half of 2011,the focal mechanism consistency parameter in the middle-east area of Tianshan Mountains presents a process from disorder to consistency,which corresponds to the group activity of strong earthquakes in Xinjiang in this period; the focal mechanism consistency parameter in the southern section of Tianshan also decreased before 2008 Wuqia MS6. 9 earthquake. In addition,we can see from the b-value image of Tianshan that earthquakes with magnitude larger than 5 occur mostly in the relatively low b value area.
【Fund】: 2014年度震情跟踪合同制定向工作任务(2014020106);; 新疆维吾尔自治区地震局基金(201401)共同资助
【CateGory Index】: P315.33
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