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本文研究了景泰地震台记录到的几种异常地震波形的形态特征及随时间分布特征,采用测震学的方法和数理统计的方法,对各个阶段的异常波形出现的数量、类型和振幅进行了定量分析,发现在1990年10月20日景泰6.2级地震前,异常波形数量明显地呈平静一密集交替出现的现象;临震前各种异常波形的数量增多,振幅增大,异常持续时间增长,震后异常波形很快衰减并消失.与其他前兆对比,可以认为异常波形的出现可能与景泰地震的孕育过程有关,根据该类波形的变化特征有可能对地震作出预报.
In this paper, the morphological characteristics and distribution characteristics of several unusual seismic waveforms recorded by Jingtai Seismic Station were studied. The number, types and amplitudes of the anomalous waveforms in each phase were studied using seismological methods and mathematical statistics Quantitative analysis shows that before the 6.2 Jingtai earthquake on October 20, 1990, the number of anomalous waveforms obviously appeared as a dense and dense phenomenon. Before the quake, the number of all kinds of anomalous waveforms increased, the amplitude increased and the anomalous duration increased After the earthquake, the anomalous waveforms quickly decayed and disappeared.Compared with other precursors, the appearance of anomalous waveforms may be related to the gestation process of Jingtai earthquake, and it is possible to predict the earthquake according to the variation characteristics of such waveforms.