大气中一种低频次声波观测研究
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摘要
分析大气中存在的一种低频次声波。利用宽频带次声测量传感器阵列组成的广域分布网络,对此种次声波进行了近5年不间断的检测。对所测次声信号的观察统计发现,它与自然事件密切相关。对这种信号波形、频谱、时频图及相关性进行分析进一步发现,该波通常以一组或间歇性多组形式出现,频率主要在0.001～0.02 Hz之间、幅度一般可达50～200 Pa。在2008年3月20日新疆于田地震、2008年5月12日四川汶川地震以及2009年10月29日陕甘川三省交界处的地震前,均检测到了大幅值的低频次声波。本文的分析结论对研究大气次声波的多样性及其与自然现象的关系提供了新的参考,对地震信息探测具有一定的实际意义。
A kind of low-frequency atmospheric infrasonic waves has been studied.Such infrasonic waves have been observed by a wide-spread sensor network array consisting of broadband infrasound microphones for about 5 years. According to continuous observations and statistic analyses,it could be possible that such kind of infrasound is closely associated with some natural events.The waveforms,spectra,time-frequency charts and correlations among sensors of these infrasonic waves have been analyzed.The results show that these waves occur either in one group or intermittently in several groups with frequencies in a range of 0.001～0.02 Hz and amplitudes in a range of 50～200 Pa.Besides, such infrasonic waves were observed previous to several strong earthquakes,such as Yutian earthquake on Mar.20th 2008,Wenchuan earthquake on May 12th 2008,Shan-Gan-Chuan border earthquake on Oct.29th 2009,and so on.The results provided in this paper may propel the study of atmospheric infrasonic waves and the correlations with natural events,especially with earthquakes.
A kind of low-frequency atmospheric infrasonic waves has been studied.Such infrasonic waves have been observed by a wide-spread sensor network array consisting of broadband infrasound microphones for about 5 years. According to continuous observations and statistic analyses,it could be possible that such kind of infrasound is closely associated with some natural events.The waveforms,spectra,time-frequency charts and correlations among sensors of these infrasonic waves have been analyzed.The results show that these waves occur either in one group or intermittently in several groups with frequencies in a range of 0.001～0.02 Hz and amplitudes in a range of 50～200 Pa.Besides, such infrasonic waves were observed previous to several strong earthquakes,such as Yutian earthquake on Mar.20th 2008,Wenchuan earthquake on May 12th 2008,Shan-Gan-Chuan border earthquake on Oct.29th 2009,and so on.The results provided in this paper may propel the study of atmospheric infrasonic waves and the correlations with natural events,especially with earthquakes.
引文
1马大猷等.现代声学理论基础.北京:科学出版社,1987
2杨训仁等.大气声学.北京:科学出版社,2007
3 Edwards W N,Brown P G et al.The trajectory,orbit, and acoustical analysis of the park forest fireball.American Geophysical Union,Spring Meeting,2004
4 Robin S M et al.An infrasound array study of Mount St. Helens.Journal of Volcanology and Geothermal Research, 2007;160(3-4):249-262
5 Robin S M et al.The source of infrasound associated with long-period events at Mount.St.Helens.Journal of geophysical research,2009;114(B4)
6 Ham F M,Acharyya R et al.Classification of infrasound surf events using parallel neural network banks.International Joint Conference on Neural Networks,2007:720- 725
7 Bayarsaikhan Ch et al.Observation of a prototype CTBT seismic and infrasound array in Ulaanbaatar,Mongolia. 50th anniversary earthquake conference commemorating the 1957 Gobi-Altay earthquake,Ulaanbaatar-Mongolia, 2007
8 Ostrovsky A E.Long-period waves and tilts of the earth's surface before strong earthquakes.Geodesy and Physics of the Earth,Proceedings of the Third International Symposium, 1976
9胡心康等.大气中一种压力波动与地震关系的初步探索.地球物理学报,1980;23(4)
10 Chilo J et al.Filtering and Extracting Features from Infrasound Data.14th IEEE-NIPSS Real Time Conference, 2005:10-10
11夏雅琴等.震前次声波信号特征研究.北京工业大学学报,2005; 31(5)
12夏雅琴等.印尼大地震震前次声信号的分析.国际地震动态, 2005;12
2杨训仁等.大气声学.北京:科学出版社,2007
3 Edwards W N,Brown P G et al.The trajectory,orbit, and acoustical analysis of the park forest fireball.American Geophysical Union,Spring Meeting,2004
4 Robin S M et al.An infrasound array study of Mount St. Helens.Journal of Volcanology and Geothermal Research, 2007;160(3-4):249-262
5 Robin S M et al.The source of infrasound associated with long-period events at Mount.St.Helens.Journal of geophysical research,2009;114(B4)
6 Ham F M,Acharyya R et al.Classification of infrasound surf events using parallel neural network banks.International Joint Conference on Neural Networks,2007:720- 725
7 Bayarsaikhan Ch et al.Observation of a prototype CTBT seismic and infrasound array in Ulaanbaatar,Mongolia. 50th anniversary earthquake conference commemorating the 1957 Gobi-Altay earthquake,Ulaanbaatar-Mongolia, 2007
8 Ostrovsky A E.Long-period waves and tilts of the earth's surface before strong earthquakes.Geodesy and Physics of the Earth,Proceedings of the Third International Symposium, 1976
9胡心康等.大气中一种压力波动与地震关系的初步探索.地球物理学报,1980;23(4)
10 Chilo J et al.Filtering and Extracting Features from Infrasound Data.14th IEEE-NIPSS Real Time Conference, 2005:10-10
11夏雅琴等.震前次声波信号特征研究.北京工业大学学报,2005; 31(5)
12夏雅琴等.印尼大地震震前次声信号的分析.国际地震动态, 2005;12
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