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《Journal of Beijing University of Technology》 2011-03
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Research of Abnormal Infrasound Signals before Worldwide Earthquakes

XIA Ya-qin,CUI Xiao-yan,LI Jun-zhi,CHEN Wei-sheng,LIU Cheng-yan(College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology,Beijing 100124,China)  
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.
【Fund】: 北京市教委(JK001999200801);; 北京工业大学青年科研基金(X1001015200803)
【CateGory Index】: P315.3
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