Study on Infrasound Waveforms from Lushan Earthquake on April 20, 2013, Sichuan, China
详细信息
- 责任者：Xu Qiang (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Zhu Xing
- 刊名：Journal of Chengdu University of Technology
- 出版年：2013
- 卷期：40(3)
- 关键词：大震 ; great earthquakes ; 弹性波 ; elastic waves ; 四川 ; Sichuan Province
- 页码：p.225-231
- 图表：illus., 1 table, 7 refs.
- 分类号：0500
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
Many infrasound events produced by the Lushan earthquake(Ms=7.0) and aftershocks(Ms>3.0) 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.
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