【摘要】 通过分析2002年12月25日乌恰5.8级地震后主震附近的地震活动特征,认为该震属孤立型地震。在地震类型判定的基础上,进一步做了以下分析工作:①乌恰-喀什区地震活动异常背景分析;②在地震活跃期内新疆境内强震主体活动区域分析;③乌恰-喀什区与阿图什-柯坪区强震活动关联性分析;④区域历史地震类型统计和震源环境分析;⑤乌恰5.8级地震和伽师-巴楚6.8级地震对区域应力场影响分析。综合分析认为,乌恰-喀什地区有明显的地震异常背景,但此次5.8、6.8级地震可能会对乌恰-喀什及周围地区的应力场产生影响,可能在一定程度上缓解该区域的应变积累,其相邻的阿图什-柯坪地区的地震活动有可能会减弱,或延缓乌恰-喀什地区的强震活动。更多还原

【Abstract】 By analyzing the characteristics of seismicities around its principal earthquake after the Wuqia earthquake with Ms5.8, we think that the earthquake with Ms5. 8 belongs to the isolation type. Based on determining the seismic type, we further gave some analyses as followed. ①The analyse of abnormal background about seismicity in Wuqia-Kashi area;②The analyse of the mainly activity areas of strong earthquakes during the activity period of earthquakes in Xinjiang; ③The relational analyse of the strong seismicities between the Wuqia-Kashi area and the Atushi-Kepin area;④The analyse of the seismic type statistics about the region historical earthquakes and the surrounding of the hypocenter;⑤The analyse of the Wuqia earthquake with Ms5. 8 and the Jiashi earthquake with Ms6. 8 effecting to the region stress field. By synthesis analyses, we thought the Wuqia-Kashi area existed an evident abnormal background of earthquakes. However, the earthquakes with Ms5. 8 and Ms6. 8 will maybe affect the stress field of Wuqia-Kashi area and its circumference. It may lessen to some extent the strain accumulation of those areas. And the seismicity of its adjacent Atushi-Kepin area may be attenuate. So it will lessen the seismicity of strong earthquakes in Wuqia-Kashi area.更多还原