芦山地震(M_S7.0)及玉树地震(M_S5.2)震前次声波异常信号分析
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摘要
中国地质大学(武汉)三峡库区地质灾害研究中心安装在三峡库区的次声波监测仪在芦山地震(2013年4月20日,MS7.0)和玉树地震(2011年6月26日,MS5.2)震前都接收到有效的异常信号。根据不同台站接收到的次声波异常信号,配合Matlab滤波和小波分析等手段,得出:芦山地震震前次声波信号的频率主要集中在(0~4)×10-3 Hz;玉树地震震前次声波信号的频率主要集中在(0~5)×10-3 Hz,且地震震级越大,震前次声波信号振幅越大。根据野三关和秭归的次声波监测仪在玉树地震震前接收到的次声波异常信号的时间差和震中与次声波监测仪台站之间的距离差,估算出玉树地震震前超低频次声波的波速约为6.4m/s。为探讨地震短临预报的可行性,文中设计了一个大三角套小三角的次声监测阵列以实现震中定位。
The infrasound monitors installed in the Three Gorges Reservoir Area by the Three Gorges Research Center for Geo-hazard of China University of Geosciences(Wuhan)had received abnormal signals before the onset of the Lushan earthquake(MS7.0,April 20,2013)and Yushu earthquake(MS5.2,June 26,2011).We analyzed the abnormal signals received by different stations using both Matlab filtration and wavelet analysis.The frequency of the precursory infrasonic signals predating the Lushan earthquake is mainly(0-4)×10-3Hz,and that of the Yushu earthquake is mainly(0-5)×10-3 Hz.The amplitude of the precursory infrasonic signal increases with the earthquake magnitude.After we analyzed the time difference of the abnormal signals received by Yesanguan and Zigui stations and the distance between the epicenter and the stations,we calculated that the velocity of the precursory ultra-low frequency infrasonic wave of the Yushu earthquake is 6.4m/s.To investigate the possibility of short-term and impending earthquake predictions,we developed a monitoring array,a big triangle array enclosing a small triangle array,to detect the location of the epicenter for the further researches.
The infrasound monitors installed in the Three Gorges Reservoir Area by the Three Gorges Research Center for Geo-hazard of China University of Geosciences(Wuhan)had received abnormal signals before the onset of the Lushan earthquake(MS7.0,April 20,2013)and Yushu earthquake(MS5.2,June 26,2011).We analyzed the abnormal signals received by different stations using both Matlab filtration and wavelet analysis.The frequency of the precursory infrasonic signals predating the Lushan earthquake is mainly(0-4)×10-3Hz,and that of the Yushu earthquake is mainly(0-5)×10-3 Hz.The amplitude of the precursory infrasonic signal increases with the earthquake magnitude.After we analyzed the time difference of the abnormal signals received by Yesanguan and Zigui stations and the distance between the epicenter and the stations,we calculated that the velocity of the precursory ultra-low frequency infrasonic wave of the Yushu earthquake is 6.4m/s.To investigate the possibility of short-term and impending earthquake predictions,we developed a monitoring array,a big triangle array enclosing a small triangle array,to detect the location of the epicenter for the further researches.
引文
[1]夏雅琴,魏树红,陈维升,等.印尼大地震震前次声异常信号的分析[J].国际地震动态,2005(12):31-36.
[2]李均之,夏雅琴,陈维升.近几年日本强地震的临震前兆信息[J].北京工业大学学报,1995,21(4):1-12.
[3]苏昉,田维.2000年4—5月强地震的前兆次声波测量研究[C]∥中国地震学会第八次学术大会论文摘要集.北京:地震出版社,2000.
[4]郑菲,夏雅琴,陈维升.次声信号与地震关系研究[C]∥中国地球物理学会第二十一届年会论文集.长春:吉林大学出版社,2005.
[5]李均之,夏雅琴,陈维升.临震预测试验及有关预测机理[C]∥香山科学会议133次学术讨论论文集.北京:科学出版社,2002.
[6]曾佐勋,王杰.芦山地震:一个成功的中期预测案例[J].地学前缘,2013,20(3):21-24.
[7]夏雅琴,孙学波,刘程艳,等.基于ARM9的次声采集与网络传输系统设计[J].北京工业大学学报,2007,33(9):985-988.
[8]吕君,郭泉,冯浩楠,等.北京地震前的异常次声波[J].地球物理学报,2012,55(10):3379-3385.
[9]谢金来,谢照华.地震次声波[C]∥中国地震学会第五次学术大会论文摘要集.北京:地震出版社,1994.
[10]夏雅琴,胡争杰,郑菲.震前次声波信号特征研究[J].北京工业大学学报,2005,31(5):461-465.
[11]胡争杰,夏雅琴,郑菲,等.利用地震波图数字化软件对次声波信号的分析[C]∥中国地球物理学会第二十届年会论文集.西安:西安地图出版社,2004.
[12]苏伟,楼海,袁松湧,等.腾冲地震/次声台阵及玉树地震记录分析[C]∥中国地球物理2010:中国地球物理学会第二十六届年会、中国地震学会第十三次学术大会论文集.北京:地震出版社,2010.
[13]潘黎黎.地震次声波与震中定位的初步探讨[D].武汉:中国地质大学(武汉),2012.
[14]蒋灏.地震预报中次声波声源方向的研究[D].北京:北京工业大学,2002.
①该监测仪于2012年调整到荆州。
[2]李均之,夏雅琴,陈维升.近几年日本强地震的临震前兆信息[J].北京工业大学学报,1995,21(4):1-12.
[3]苏昉,田维.2000年4—5月强地震的前兆次声波测量研究[C]∥中国地震学会第八次学术大会论文摘要集.北京:地震出版社,2000.
[4]郑菲,夏雅琴,陈维升.次声信号与地震关系研究[C]∥中国地球物理学会第二十一届年会论文集.长春:吉林大学出版社,2005.
[5]李均之,夏雅琴,陈维升.临震预测试验及有关预测机理[C]∥香山科学会议133次学术讨论论文集.北京:科学出版社,2002.
[6]曾佐勋,王杰.芦山地震:一个成功的中期预测案例[J].地学前缘,2013,20(3):21-24.
[7]夏雅琴,孙学波,刘程艳,等.基于ARM9的次声采集与网络传输系统设计[J].北京工业大学学报,2007,33(9):985-988.
[8]吕君,郭泉,冯浩楠,等.北京地震前的异常次声波[J].地球物理学报,2012,55(10):3379-3385.
[9]谢金来,谢照华.地震次声波[C]∥中国地震学会第五次学术大会论文摘要集.北京:地震出版社,1994.
[10]夏雅琴,胡争杰,郑菲.震前次声波信号特征研究[J].北京工业大学学报,2005,31(5):461-465.
[11]胡争杰,夏雅琴,郑菲,等.利用地震波图数字化软件对次声波信号的分析[C]∥中国地球物理学会第二十届年会论文集.西安:西安地图出版社,2004.
[12]苏伟,楼海,袁松湧,等.腾冲地震/次声台阵及玉树地震记录分析[C]∥中国地球物理2010:中国地球物理学会第二十六届年会、中国地震学会第十三次学术大会论文集.北京:地震出版社,2010.
[13]潘黎黎.地震次声波与震中定位的初步探讨[D].武汉:中国地质大学(武汉),2012.
[14]蒋灏.地震预报中次声波声源方向的研究[D].北京:北京工业大学,2002.
①该监测仪于2012年调整到荆州。
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