1999年轮台5.1级地震近场地倾斜资料异常分析  

Analysis on Near Field Ground Tilt Data Anomaly before Luntai M_S5.1 Earthquake in 1999

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：《华南地震》2009年第1期53-60,共8页South China Journal of Seismology

基　　金：中国地震局国家科技支撑计划子专题(2006BAC01B02-02-01);地震科学联合基金(606050)联合资助

摘　　要：利用小波分析独特的时—频分析特性,对轮台5.1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,分析结果发现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3～4个月;震前异常具有从外围向震中发展且幅度明显增强的时空演化特征。分析认为:这些异常可能与1999年轮台5.1级地震的孕育过程有关。The unique F-T analysis characteristic of wavelet analysis was utilized to analyze the multi-station near field ground tilt data before Luntai Ms5.1 earthquake in 1999. The results show that almost all the ground tilt stations near the epicenter recorded some similar anomaly signals within a same frequency band. The periods of the anomaly signals vary from several days to over ten days. The anomaly signals nearly appeared at the same time at different stations, mainly within 3 to 4 months before the earthquake. Spatially, the anomaly intensity increased obviously from far field to the epicenter region. These similar anomaly signals may be related to Luntai Ms5.1 earthquake in 1999.

关 键 词：地倾斜异常 轮台5.1级地震 小波分析 群体异常 

分 类 号：P315.725[天文地球—地震学]