地震尾波的某些特性的探讨

RESEARCH ON SOME CHARACTERISTICS OF THE SEISMIC CODA

摘要:

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。

Abstract:

Based on studying seismic coda characteristics of both artificial and natural sources, we have discussed the coda amplitude decline, the coda frequency and the other parameter Q₁, which change as time goes by.
The results indicate that the different parameters α, K, Q get identity of variation. Comparing the results from seismic source and from the experiment, we believe that they are similar to each other So it is possible to carry some prophetic Information in some parameters ofco da defore an earthpuake occurs.
we will improve our work in future.