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本文在对人工地震资料的尾波特性进行探讨的基础上,进一步以天然地震的资料为对象,讨论了尾波振幅衰减特性α的变化情况和尾波频率随时间的变化特性。天然地震的资料分两类,一是用本区(强震震源区)发生的小震资料,二是用外区(强震震源区以外)发生的中小震资料。两类地震均由同一组台站记录。通过一些天然地震震例的分析、对此,可得到以下结果: (1)对尾波散射区的考虑。(2)尾波特征参量携带强震前兆信息的可能性。(3)不同物量参量变化一致性的初步认识。(4)天然地震源,人工地震源、实验三者的尾波参量随时间变化的良好吻合。(5)品质因素相对变化趋势的简易估计。不可否认方法的局限性及各种干扰因素的存在。
Based on the study of the coda characteristics of artificial seismic data, this paper further studies the variation of coda attenuation characteristics α and the variation of coda frequency with time based on the data of natural earthquakes. There are two types of information on natural earthquakes. One is the use of small earthquakes in this area (the strong earthquakes) and the second is the small and medium earthquakes in the outer areas (other than the strong earthquakes). Both types of earthquakes are recorded by the same group of stations. Through the analysis of some natural earthquakes, we can get the following results: (1) Consideration of the scattering area of wake. (2) The possibility that coda wave parameters carry precursory information of strong earthquakes. (3) The initial recognition of the consistency of the changes of different physical quantity parameters. (4) The cochlear parameters of natural seismic source, artificial seismic source and experiment agree well with time. (5) a simple estimation of the relative change trend of quality factors. The undeniable limitations of the method and the existence of various disturbing factors.