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.
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
