2007年7月20日新疆特克斯5.9级地震及震前部分地震学前兆异常  

A Summary of Tekesi M_S 5.9 Earthquake Occurred on July 20,2007 and Some Seismological Precursory Anomalies

作　　者：李莹甄[1] 聂晓红[1] 夏爱国[1] 高歌[1] 

机构地区：[1]新疆维吾尔自治区地震局,乌鲁木齐市北京南路42号830011

出　　处：《中国地震》2008年第4期370-378,共9页Earthquake Research in China

基　　金：国际合作重点项目(2004DFA0005);"十一五"科技支撑计划子专题(2006BAC01B03-04-02);新疆地震科学基金(200701)联合资助

摘　　要：介绍了2007年7月20日新疆特克斯5.9级地震的基本参数、震源机制解、地震序列特征、震源参数、发震构造和局部构造应力场等;分析了震前周围台站地震波参数的变化和部分地震学前兆异常特征。研究认为,特克斯5.9级地震发生在伊犁盆地南缘具有强构造运动背景的高应力少震区,是那拉提断裂发生左旋走滑错动所致,为一次孤立型的地震事件。震前观察到震中附近P波与S波振幅比的变化。震前震中周围地区曾出现4级地震围空、2级地震带状图像,震前5个月内北天山震群活跃,震前2个月地震窗出现异常。The paper introduces the parameters of Tekesi Ms 5.9 earthquake including occurring time, epicenter, magnitude, focal mechanism and earthquake the related seismogenic tectonic and regional stress field. The paper analyzes precursory anomalies. The results show that the earthquake has occurred on Nalati on July 20, 2007, source parameters, some seismological Fault, a left lateral strike-slip fault, in southern margin area of Yili Basin, and is classified as the isolated-shock type. Before the quake, some seismological precursory anomalies are found in the areas surrounding the epicenter, such as amplitude ratio, seismic gap （ Ms≥ 4.0）, seismic belt （ Ms≥ 2.0）, seismic swarm in five months before the quake and seismic window anomaly in two months.

关 键 词：特克斯5.9级地震 地震波参数 地震学前兆异常 

分 类 号：P315[天文地球—地震学]