阿图什6.7级地震近场地倾斜群体异常小波分析  

STUDY ON WAVELET ANALYSIS OF GROUND TILT DATA GROUPING ANOMALY IN NEAR FIELD BEFORE ATUSHI EARTHQUAKE WITH M_S6.7 IN 1996

作　　者：孙甲宁[1] 温和平[1] 高歌[1] 

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2008年第3期212-218,共7页Inland Earthquake

基　　金：中国地震局国家科技支撑计划子专题(2006BAC01B02-02-01);中国地震局科研项目(120602-0957-03);新疆地震科学基金(200507)联合资助

摘　　要：利用小波分析独特的时频分析特性，对1996年阿图什6．7级地震前近场多台地倾斜连续观测资料进行了多尺度分解分析。在地震前震中附近的地倾斜台站几乎都接收到了相同频段的异常信号，周期为几天到十几天，异常信号出现在各个台站的时间也大致相同，主要集中在震前3—5个月，震前异常具有从外围向震中发展且幅度明显增强-向外围扩散-发震的时空演化特征。这些异常可能与1996年阿图什6．7级地震的孕育过程有关。Using the unique frequency-time analysis characteristic of wavelet analysis, we analyzed variously the continuous observation data of ground tilt of many stations in near field before Atushi earthquake with Ms6.7. Before the earthquake, the ground tilt station nearby the epicenter almost recorded some anomaly signals with the same frequency band. Its period is from several days to over ten days. The time of anomaly signals appeared nearly at the same time in different stations. They gathered mainly in 3 to 5 months before earthquakes. Before the earthquake, the anomalies have some characteristic of development from periphery to the epicenter and the space-time evolvement of obvious strengthen about extent--diffuse to periphery--earthquake occurrence. These anomaly may be interrelated with the process of gestation about Atushi earthquake with Ms6.7 in 1996.

关 键 词：阿图什6.7级地震 小波分析 地倾斜 群体异常 

分 类 号：P315.72[天文地球—地震学]