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Study on the precursor infrasound waves emitted before the occurrence of strong earthquakes has been performed, so as to discover the relationship among position, arriving time, intensity of the infrasound wave and earthquakes. With the special kind of infrasound microphone CASI-ICM-2011, a kind of infrasound waves with frequencies from 0.001 Hz to 0.01 Hz, peak sound pressure level from 50 Pa to 200 Pa, continuous time period from half hour to 4 hours, and propagation speed from 10 m/s to 30 m/s, arising no more than two weeks, was received before a series of earthquakes over Ms6.0 occur. Amplitude of the signal is higher when the earthquake is stronger. In the far field the sensor network was spread in north-east China with automatic data uploading to a central server computer in Beijing. Precursor infrasound waves emitted 4 days before Ms7.0 Lu-san earthquake have been positioned perfectly as a sound cloud map, also the infrasound wave emitted 12 days before Ms7.7 Pakistan earthquake has been positioned. A long-time continuous signal over 8 years has been analysed without a bit gap, showing several effective signals accompanying earthquakes. Law of the infrasound generation has been discussed with a suggestion for the mechanism that the infrasound could be radiated by a large scale surface vibration near one million square kilometers in earthquake developing. Two demonstrative signals received after Ms8.8 Chile earthquake and Yu-shu earthquake were provided to prove this suggestion. The detected signal shows that the infrasound wave arrives accompanying S wave at the same time. One model is provided as a piston sound source to simulate very low frequency infrasound radiated by large surface vibration. All the presented signals in this paper should be useful for precursor information obtained for close earthquake prediction.
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Keywords:
- before earthquake /
- precursor infrasound /
- infrasound observation
[1] Ostrovsky A E Geodesy and Physics of the Earth: Proceeding of the third international symposium Weimar, Germany, October 25-31, 1976 p673
[2] Gossard R E, Hooke W H 1975 Wave in the Atmosphere (New York: Elsevier Scientific Publishing Company) p281
[3] Hu X K, Shi J R, Ren J G 1980 Chinese J. Geophys. 23 450 (in Chinese)[胡心康, 石金瑞, 任建国 1980 地球 23 450]
[4] Xia Y Q, Cui X Y, Li J Z 2011 Journal of Beijing University of Technology (Social Sciences Edition) 37 463 (in Chinese) [夏雅琴, 崔晓艳, 李均之 2011 北京工业大学学报 37 463 ]
[5] Xia Y Q, Liu J Y, Cui X Y 2011 Journal of Asian Earth Sciences 41 434
[6] Lin L, Yang Y C 2010 Acta Acoustica 35 200 (in Chinese) [林琳, 杨亦春 声学学报 35 200]
[7] L J, Guo Q, Yang Y C, Feng H N, Teng P X 2012 Chinese J. Geophys. 55 3379 (in Chinese) [吕君, 郭泉, 杨亦春, 冯浩楠, 滕鹏晓 2012 地球 55 3379]
[8] Yang Y C, Ma C Z, Li X D, Tian J 2003 Acta Acoustica 28 159 (in Chinese) [杨亦春, 马驰州, 李晓东, 田静 2003 声学学报 28 159]
[9] Teng P X, Ma C Z, Yang Y C, Li X D 2007 Acta Acoustica 26 227
[10] Zhang C J, Shi Y L, Ma L Chinese Geophysical the 21th Annual Meeting Changchun, China, August 26-30 2005
[11] Zhang C J, Shi Y L 2005 Journal of University of Chinese Academy of Sciences 22 258 (in Chinese) [张晁军, 石耀霖 2005中国科学院大学学报 22 258]
[12] L J, Zhao Z Y, Zhou C 2011 Acta Phys. Sin. 60 104301 (in Chinese)[吕君, 赵正予, 周晨 2011 60 104301]
[13] Zhou C, Wang X, Zhao Z Y, Zhang Y N 2013 Acta Phys. Sin. 62 154302 (in Chinese)[周晨, 王翔, 赵正予, 张援农 2013 62 154302]
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[1] Ostrovsky A E Geodesy and Physics of the Earth: Proceeding of the third international symposium Weimar, Germany, October 25-31, 1976 p673
[2] Gossard R E, Hooke W H 1975 Wave in the Atmosphere (New York: Elsevier Scientific Publishing Company) p281
[3] Hu X K, Shi J R, Ren J G 1980 Chinese J. Geophys. 23 450 (in Chinese)[胡心康, 石金瑞, 任建国 1980 地球 23 450]
[4] Xia Y Q, Cui X Y, Li J Z 2011 Journal of Beijing University of Technology (Social Sciences Edition) 37 463 (in Chinese) [夏雅琴, 崔晓艳, 李均之 2011 北京工业大学学报 37 463 ]
[5] Xia Y Q, Liu J Y, Cui X Y 2011 Journal of Asian Earth Sciences 41 434
[6] Lin L, Yang Y C 2010 Acta Acoustica 35 200 (in Chinese) [林琳, 杨亦春 声学学报 35 200]
[7] L J, Guo Q, Yang Y C, Feng H N, Teng P X 2012 Chinese J. Geophys. 55 3379 (in Chinese) [吕君, 郭泉, 杨亦春, 冯浩楠, 滕鹏晓 2012 地球 55 3379]
[8] Yang Y C, Ma C Z, Li X D, Tian J 2003 Acta Acoustica 28 159 (in Chinese) [杨亦春, 马驰州, 李晓东, 田静 2003 声学学报 28 159]
[9] Teng P X, Ma C Z, Yang Y C, Li X D 2007 Acta Acoustica 26 227
[10] Zhang C J, Shi Y L, Ma L Chinese Geophysical the 21th Annual Meeting Changchun, China, August 26-30 2005
[11] Zhang C J, Shi Y L 2005 Journal of University of Chinese Academy of Sciences 22 258 (in Chinese) [张晁军, 石耀霖 2005中国科学院大学学报 22 258]
[12] L J, Zhao Z Y, Zhou C 2011 Acta Phys. Sin. 60 104301 (in Chinese)[吕君, 赵正予, 周晨 2011 60 104301]
[13] Zhou C, Wang X, Zhao Z Y, Zhang Y N 2013 Acta Phys. Sin. 62 154302 (in Chinese)[周晨, 王翔, 赵正予, 张援农 2013 62 154302]
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