甘宁青新地区部分中强震前地震波参数的异常变化
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摘要
本文通过研究甘、宁、青、新地区部分中强震前多种地震波参数的变化特征,探索西北地区中强震孕震过程。结果表明,地震波的(?)初动符号和初动半周期、振幅比、尾波持续时间比、尾波衰减系数α值、介质品质因子Q值在大震前一二年中均有异常变化,它们从不同角度反映了介质的非均匀性及孕震过程中地震波的衰减吸收特性。
In this paper the variable characteristics of several parameters of seismic wave before some moderately strong earthquakes in Gansu, Qinghai, Ningxia and Xinjiang regions have been studied for exploring the process of earthquake preparation in Northwest China. The results show that several parameters, such as first motion mark of P wave and its half period, amplitude ratio, ratio of coda wave duration, coda attenuation coefficient value a,quality factor value Ω,weve varied one or two years ago. They reflect the characteritics of attenuation and absorption of seismic wave during the process the earthquake preparation and represent the anisotropy of the media at a different angle.
引文
[1] 冯德益,地震波速异常,地震出版社,1981年。
    [2] 王海涛等,单台地震预报的地震学方法,地震出版社,1992年。
    [3] 夏玉胜等,尾波持续时间比τ_H/τ_V在强震短临预报中的应用,西北地震学报,14,3,1992年。
    [4] 石田瑞穗等,1952年加利福尼亚克思县地震前地震活动和小震波谱随时间的变化,国外地震,5,1981年。

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