2011年8月11日新疆阿图什、伽师交界5.8级地震序列及震前部分地震学异常特征

SEISMOLOGICAL ANOMALY AND SEQUENCE CHARACTERISTICS OF ATUSHI、 JIASHI EARTHQUAKE WITH M_S5.8 ON AUG 11^(TH),2011

介绍了2011年8月11日新疆阿图什、伽师交界5.8级地震基本参数、地震序列特征,分析了震前震区周围及相邻构造区地震活动特征。研究结果表明:(1)5.8级地震发生在柯坪断裂,震源断错类型为逆冲型;(2)该地震序列为主-余型,余震衰减较快;(3)地震活动表明震前存在4级地震围空、地震平静、中等地震增强、地震学参数时间扫描异常等中期异常和小震群活动短期异常。

This paper introduced basic parameters and earthquake sequence characteristic of Atushi, Jiashi earthquake with Ms5.8 on Aug 11^th, 2011. According to characteristics of seismic activity in earthquake region and nearby tectonic region , the results showed： （ 1 ） the causative structure is Keping fault and the earthquake is thrust type ; （2） the earthquake belongs to main shock-after shock type and the aftershock attenuation is quickly; （3）there are mid-term anomalies such as： seismic gap, seismic quiescence, moderate earthquakes increasing and seismic parameters, also short-term anomalies like small swarms occurred before Atushi ,Jiashi earthquake.