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《Progress in Geophysics》 2014-01
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Analysis the tectonics significances and calculation the focal mechanism solutions of middle-small earthquakes in Xining basin and its adjacent area

TU Hong-wei;WAN Xiu-hong;ZHAO Yan-jie;GAO Hui-hui;MEN Fan-bo;DING Ning-xia;Earthquake administration of Qinghai;Seismology institute of Lanzhou;  
Use the initial motion P wave within 200km of the distance from epicenter to station,we calculated 62 focal mechanism solutions of M_L 2.3?5 from 2008 to 2011 in Xining basin and its adjacent area,then summed the main stress parameter according to the focal mechanism.The result shows,the small earthquakes' focal mechanism have some random characteristics,The north region appears that the P axis azimuth range is 47?52?and its elevation range is 4?5.5?the T axis zimuth range is 142?148?and its elevation range is43?45? The southern part shows that the P axis zimuth range is 155?255?and its elevation range is??the T axis azimuth range is??and its elevation range is 89?90? The main characteristic of earhtuqake fault is thrust and strike-slip in north part,and the south part is very complicated,but the main characteristic of earthquake fault is thrust,however,according the characteristic of regional stress field,though it seems irregular in surface,but in fact,it still under the control of NE-WS' pressure and NWW-ESE's tension stress.The analysis shows,under the regional stress field,earthquake(especially small quakes) may appear diversity,but,if with large samples,the main stress still in according with the background' s.This phenomenon can be useful reference in related research,such as,for micro-region stress and aftershock's focal mechanism research.
【Fund】: 中国地震局星火计划(XH12051Y);; 青海省地震局地震研究基金(2012A);; 留学基金联合资助
【CateGory Index】: P315.33
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