地脉动及特殊波形的频谱特性在地震预报中的应用

地震 ›› 1998, Vol. 18 ›› Issue (1): 75-82.

地脉动及特殊波形的频谱特性在地震预报中的应用

陈化然, 郭瑞芝, 冯德益

中国天津 300201 天津市地震局

收稿日期:1997-04-15 修回日期:1997-06-06 出版日期:1998-01-31 发布日期:2022-05-10
作者简介:陈化然,男,1966年5月出生,助理研究员,1991年获硕士学位,主要从事地震波、地磁等研究工作。

SPECTRAL CHARACTERISTICS OF MICROSEISMS AND SPECIAL WAVEFORMS AND ITS APPLICATION IN EARTHQUAKE PREDICTION

Chen Huaran, Guo Ruizhi, Feηg Deyi

Seismological Bureau of Tianjin Municipality, Tianjin 300201, China

Received:1997-04-15 Revised:1997-06-06 Online:1998-01-31 Published:2022-05-10

摘要/Abstract

摘要： 利用功率谱和Sompi 谱分析方法,对大震前地脉动及震前特殊波形等记录进行了比较深入的研究,结果表明：①较大地震前短周期地脉动及震前特殊波形频谱的峰值频率f_m,拐角频率f_c,相对频带宽度△f,相对峰值S_m/S₀,高频段的斜率绝对值|b|及Sompi谱的卓越频率f_d等特征量均可能呈现出较明显的下降（少数为上升）异常变化;②各频谱特征量呈现异常的时间基本上同步,并与波速异常发展趋势基本相符;③以上异常变化可能反映震前孕震区地下徽破裂的形成与发展过程;④地脉动特征量可能为地震中长期及短临预报的研究提供一些有用的信息,有广泛的应用前景。

关键词: 微破裂, 短周期地脉动, 特殊波形, 功率谱和Sompi谱, 频谱特征量

Abstract: By using the methods of the power spectral analysis and Sompi spectral analysis, the authors have studied the short-period microseism waveform and some special waveforms before some large earthquakes ,and the results show that: before larger earthquakes, the peak frequency,corner frequency,relative width of frequency domain,relative value of peak spectrum, the absolute slope value of high frequencies and Sompi spectral frequency may decrease (some may increase). So,some of them may be used as an important index for earthquake prediction.

Key words: Microcrack Microseisms, Special waveform, Power spectral analysis, Sompi spectral analysis

陈化然, 郭瑞芝, 冯德益. 地脉动及特殊波形的频谱特性在地震预报中的应用[J]. 地震, 1998, 18(1): 75-82.

Chen Huaran, Guo Ruizhi, Feηg Deyi. SPECTRAL CHARACTERISTICS OF MICROSEISMS AND SPECIAL WAVEFORMS AND ITS APPLICATION IN EARTHQUAKE PREDICTION[J]. EARTHQUAKE, 1998, 18(1): 75-82.