【摘要】 分析了2009年2月20日柯坪5.2级地震前柯坪块体地震活动和前兆异常。柯坪5.2级地震前5、6级地震异常平静,4级地震平静达到了"十五"项目总结的异常指标,且震前1个半月2级以上地震"成片"向震中附近地区迁移;震前乌什水管仪、阿合奇地倾斜和巴楚土层应力存在不同程度的中短期异常和临震异常。更多还原

【Abstract】 The seismicity and precursory anomalies in Keping block before Keping Ms 5.2 earthquake on Feb.20,2009 are analyzed in the paper.Before Keping Ms 5.2 earthquake,the precursory background of quietness of Ms 5-6 earthquakes in the block is obviously,the quietness of Ms 4 earthquakes reached the anomaly index summed by "tenth five-year-plan" project,Ms≥2.0 earthquakes migrated to the central area of Keping Ms 5.2 earthquake,and different anomalies of ground tilt in Wushi and Aheqi stations and ground stress in Bachu station were appeared.更多还原