1999年轮台5.1级地震近场地倾斜资料异常分析
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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.
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.
引文
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[2]张燕,吴云,刘永启,等.大姚6级双震前的地震前兆特征[J].大地测量与地球动力学,2003,24(4):72-75.
[3]邵辉成,金学申.小波分析在地震趋势预测中的应用[J].中国地震,2000,16(1):48-52.
[4]郑治真,胡劲波.瞬时频谱分析及其在地震趋势估计中的应用[J].地震学报,1993,15(1):68-75.
[5][美]崔锦泰,程正兴(译).小波分析导论[M].西安:西安交通大学出版社,1995.
[6]胡昌华,张军波,夏军,等.基于Matlab的系统分析与设计一小波分析[M].西安:西安电子科技大学出版社.1999.
[7]刘希强,周惠兰,郑治真,等.基于小波变换的信号突变检测、滤波和瞬态谱研究[J].国际地震动态,1998,(1):1-8.
[8]孙甲宁,夏爱国,高小其,等.乌鲁木齐1O号泉流量变化的多尺度小波分析和异常识别[J].内陆地震,2003,17(4):317-325.
[9]孙甲宁,温和平.乌什台地倾斜资料的小波分析研究[J].高原地震,2006,18(4):1-8.
[10]李杰,刘希强,李红,等.利用小波变换方法分析形变观测资料的正常背景变化特征[J].地震学报,2005,27(1):103-108.
[11]张雁滨,蒋骏,钱家栋,等.地壳介质微形变异常与强震短临前兆[J].地震学报,2002,24(1):33-41.
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