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《South China Journal of Seismology》 2009-04
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Background Anomaly of Wuqia M_s6.9 Earthquake Occurred on Oct.5,2008

WANG Xiaorong,JIANG Jingxiang,LI Zhihai,ZHANG Yi and GAO Ge (Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China)  
The background anomalies of Wuqia M_S6.9 earthquake occurred on Oct.5,2008 were analyzed in this paper,including:the space-time distribution of earthquakes with M_S≥6.8 from 1900 to 2008 in Xinjiang shows that there is a lack of M_S6.8 earthquake after Yutian M_S7.4 earthquake in Xinjiang;the accumulation frequency of earthquakes with M_S≥3.5 continued to be low;M_S6.0 earthquakes is anomaly quiescent in Wuqia region;M_S4.0 seismic gap has come into being in Wuqia region since 2003,while two M_S4.0 seismic belts in Xinjiang has come into being and intersecting in Wuqia region since 2006;the amplitude ratios of seismic wave of Wuqia seismic station show low values in a large range from Jan.2006 to Jul.2008;the abnormal phenomenon of seismic activity appeared two times in Kenzitearte fault;the error values of fitted line of vertical geomagnetic component of Kashi station show low values since Feb.2008;the values of two channels of soil stress in Shache station have successively departed from the annual change value since Sep.2006.
【Fund】: 中国地震局2008年重点危险区专项
【CateGory Index】: P315.727
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