新疆伽师及邻区地震与控震构造分析

１９９６年３月－－１９９７年４月间，新疆伽师西部相继发生６．９级强震一由７次６－６．６级子震所构成的强震群。历史上伽师及邻区曾发生多次强烈地震，导致伽师及邻区包括塔里木盆地周缘地震强烈活动的原因，是印度岩石圈块体快速北向运动造成的ＳＮ向强烈坟与欧亚岩石圈块体缓慢向运动所引起的左旋走滑的联合作用及其相关的现今不同方向、不同性质的断裂活动。区域性ＥＷ向盆缘活动断裂控制盆缘大型地震活动的空间展布，盆缘Ｅ

ANALYSIS OF THE JIASHI,XINGJIANG,EARTHQUAKE AND THE RELATED TECTONIC ACTIVITY

A major shock of M=6.9 followed by a swarm of strong after-shocks of magnitude between 6 and 7 occurred in the west of Jiashi County of the Xinjiang Uygur Autonomous Region from March 1996 through April of 1997 at the west margin of the Tarim Basin. And historical strong earthquakes had been located in Jiashi and the vicinity before 1990s. The strong seismic activity around the Tarim Basin including Jiashi County is mainly caused by the convergence of the fast northward lithospheric motion of India-Australia plate and the slow westward lithospheric motion of Eurasia plate and the resulting N-S compression, sinistral strike-slipping and faulting of different properties. The regional E-W-trending active marginal faults surrounding the Tarim Basin control the distribution of marginal seismic zones. The strong earthquakes are most likely to occur where the regional E-W trending faults meet the minor NS-NNW, NW and NE-trending faults as exampled by the Jiashi swarm. Although there is little possibility for large earthquake to take place between epicentral areas of the Jiashi earthquake swarm in the near future, occurrences of earthquakes with magnitude between 6 and 7 can not be precluded in the east and south adjoining regions in recent years.