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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2013-03
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Study on infrasound waveforms from Lushan earthquake on April 20,2013,Sichuan,China

XU Qiang1,ZHU Xing1,LI Wei-le1,DENG Mao-lin1 ZHENG Guang1,LI Zhen-hua2 1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China; 2.Department of Network Center,China West Normal University,Nanchong 637002,China  
Many infrasound events produced by the Lushan earthquake(Ms=7.0) and aftershocks(Ms3.0) in Sichuan were detected and recorded perfectly on a digital infrasonic monitoring instrument located in Chengdu City.All of the recorded infrasound events were processed and analyzed by the time-frequency distribution analysis method,that is STFT(short time Fourier transform).The analysis results show that the characteristics of the infrasound waves from the Lushan earthquake as follows.(1) The characteristic frequency ranges from ~3 to 4 Hz.(2) The excellent frequency of the main earthquake is about 3.2 Hz,and the max amplitude of the time-frequency distribution spectrum is about 220.Furthermore,the infrasound wave from the main earthquake lasted long time about 230 seconds.(3) The magnitudes(Ms) of many aftershocks and the max amplitudes(Amax) of the corresponding infrasound events in time-frequency spectrum have a good relationship: Ms=0.60105 lgAmax +2.06383,and the correlation coefficient is 0.84.Therefore,infrasound may be a new method to detect and early warn geo-disasters caused by rock failures,such as earthquake,landslide,and so on.
【Fund】: 国家重点基础研究发展计划项目(2013CB733200);; 国家杰出青年科学基金资助项目(41225011);; 教育部长江学者特聘教授项目
【CateGory Index】: P315.6
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【Citations】
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