南黄海6.1级地震前地震波动力学特征变化指标的研究

研究了南黄海６１级地震前地震波动力学特征的变化，诸如Ｓ波、Ｐ波频谱的峰值频率，拐角频率，相对频带宽度，相对频谱峰值，波速比，Ｐ波初始部分波形的时间线性度及Ｐ波初始段平均半周期等。结果表明：震前地震波动力学各特征指标均有一定的异常变化，且大多能较好地反映出约０５ａ左右的前兆异常。指出地震预报中同时使用这些指标的可行性。

Study on Variation Index of Seismic Wave Dynamic Characteristics Before M S 6 1 Earthquake in Yellow Sea

In this paper,the variation of dynamic characteristics of seismic waves before M S 6 1 earthquake in yellow sea have been studied,for example,temporal linearity of wave form of initial part of S,P wave,its average half period,the peak frequency,corner frequency,width of frequency domain,relative value of peak spectrum,wave velocity ratio.It is found out that the indices of wave dynamic characteristics befor earthquake have anomalously variation and most of them indicate short term(half year)precursory variations,they can be simultaneousoy used in short term earthquake prediction