震前次声波异常信号的研究
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摘要
根据美国地质调查局公布的地震目录,2002—2008年全球共发生了92次7级以上的地震.其中,78次震前接收到了次声波异常信号,占84.8%.次声波异常信号的幅值均超过1 000 mV,次声异常信号的频率在10-3 Hz量级.异常信号结束后9 d内发震的有45次,占57.7%.本文以这92个地震为统计对象,讨论了震级M、观测点到震中的距离D与次声波异常信号最大幅值Um的关系.结果表明,次声波异常信号与地震的发生有较好的对应关系,但Um与M、D呈现出复杂的关系.
According to the U.S.Geological Survey,there are 92 earthquakes that M≥7.0 happened worldwide from 2002 to 2008.About 78 of these earthquakes or 84.8% are preceded the signals.The amplitudes of these abnormal infrasound signals were greater than 1000mV,and the frequency of the abnormal infrasound signals was about 10-3Hz.There are 45 or 57.7% of these earthquakes happened within 9 days after the abnormal signals were recorded.In this paper,92 worldwide earthquakes were investigated,and the relationship between the earthquake magnitude,M,the distance of observation points to the epicenter,D and the maximum amplitude of the abnormal signal,Um.The results show that the infrasound abnormal signals have good correlation with earthquakes,but Um vs.M,and D are the complicated relationship.
According to the U.S.Geological Survey,there are 92 earthquakes that M≥7.0 happened worldwide from 2002 to 2008.About 78 of these earthquakes or 84.8% are preceded the signals.The amplitudes of these abnormal infrasound signals were greater than 1000mV,and the frequency of the abnormal infrasound signals was about 10-3Hz.There are 45 or 57.7% of these earthquakes happened within 9 days after the abnormal signals were recorded.In this paper,92 worldwide earthquakes were investigated,and the relationship between the earthquake magnitude,M,the distance of observation points to the epicenter,D and the maximum amplitude of the abnormal signal,Um.The results show that the infrasound abnormal signals have good correlation with earthquakes,but Um vs.M,and D are the complicated relationship.
引文
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[9]LI Jun-zhi,XIA Ya-qin,CHEN Wei-sheng,et al.Future systems for earthquakes early warning[M].New York:NovaScience Publishers,2008:111-126.
[10]李均之,陈维升,夏雅琴.在2004年12月26日印尼9级地震前收到特大临震信息[J].地球物理学进展,2006,21(4):1061-1063.LI Jun-zhi,CHEN Wei-sheng,XIA Ya-qin.Imminent very strong infrasonic wave precursor received before the earthquake ofmagnitude 9.0,26th Dec.2004 of Indonesia[J].Progress in Geophysics,2006,21(4):1061-1063.(in Chinese)
[11]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.XIA Ya-qin,HU Zheng-jie,ZHENG Fei.Research of infrasound signal before earthquake[J].Journal of Beijing Universityof Technology,2005,31(5):461-465.(in Chinese)
[2]翁文波.预测论基础[M].北京:石油工业出版社,1984:51-56.
[3]耿庆国.中国旱震关系研究[M].北京:海洋出版社,1985:117-119.
[4]任振球,李均之,曾小苹.大地震临震预测的研究进展[J].地学前缘,2001,8(2):217-223.REN Zhen-qiu,LI Jun-zhi,ZENG Xiao-ping.The progress of forecast research on impending violent earthquakes[J].EarthScience Frontiers,2001,8(2):217-223.(in Chinese)
[5]曾小苹,林云芳.地磁“时序”非规则信息的结构转换与灾害和事故的预测[J].科学研究月刊,2006,2:126-129.ZENG Xiao-ping,LIN Yun-fang.Prediction of Geomagnetism“timing”structural transformation of the irregular informationand accident and disaster[J].Scientific Research Monthly,2006,2:126-129.(in Chinese)
[6]Li J Z,Bai Z Q,Chen W S,et al.Strong earthquakes can be predicted:a multidisciplinary method for strong earthquakeprediction[C]∥Natural Hazards and Earth System Sciences.Berlin:European Geosciences Union,2003,3(6):703-712.
[7]李均之,夏雅琴,陈维升,等.临震预测试验及有关预测机理[C]∥香山科学会议第133次学术讨论会论文集.北京:科学出版社,2002:3-11.LI Jun-zhi,XIA Ya-qin,CHEN Wei-sheng,et al.Imminent prediction for examination and about predicted mechanism[C]∥The transactions of 133 China Xiangshan Science Conference.Beijing:Science Press,2002:3-11.(in Chinese)
[8]谢金来,杨训仁.次声噪声场的测量与分析[J].声学学报,1991,16(3):230-234.XIE Jin-lai,YANG Xun-ren.Measurements and analyses of infrasound noise field in the atmosphere[J].Acta Acustica,1991,16(3):230-234.(in Chinese)
[9]LI Jun-zhi,XIA Ya-qin,CHEN Wei-sheng,et al.Future systems for earthquakes early warning[M].New York:NovaScience Publishers,2008:111-126.
[10]李均之,陈维升,夏雅琴.在2004年12月26日印尼9级地震前收到特大临震信息[J].地球物理学进展,2006,21(4):1061-1063.LI Jun-zhi,CHEN Wei-sheng,XIA Ya-qin.Imminent very strong infrasonic wave precursor received before the earthquake ofmagnitude 9.0,26th Dec.2004 of Indonesia[J].Progress in Geophysics,2006,21(4):1061-1063.(in Chinese)
[11]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.XIA Ya-qin,HU Zheng-jie,ZHENG Fei.Research of infrasound signal before earthquake[J].Journal of Beijing Universityof Technology,2005,31(5):461-465.(in Chinese)
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