成都理工大学学报（自然科学版）2013，Vol.40Issue(3)：225-231,7.DOI:10.3969/j.issn.1671-9727.2013.03.01
“4·20”芦山地震次声波研究
Study on infrasound waveforms from Lushan earthquake on April 20, 2013, Sichuan, China
摘要
Abstract
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 timefrequency 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.关键词
芦山地震/地震次声波/时间-频率分布/STFTKey words
Lushan earthquake/seismic infrasound/time-frequency distribution/ STFT分类
天文与地球科学引用本文复制引用
许强,朱星,李为乐,邓茂林,郑光,李振华..“4·20”芦山地震次声波研究[J].成都理工大学学报（自然科学版）,2013,40(3):225-231,7.基金项目
国家重点基础研究发展计划项目(2013CB733200) （2013CB733200）
国家杰出青年科学基金资助项目(41225011) （41225011）
教育部长江学者特聘教授项目 （）
