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本文使用邢台1965～1985年频度、强度资料,采用一维随机数字时间序列统计分析,推出N、N_3随时间变化的趋势曲线。根据1979年后曲线出现的异常形态,分析地震新序列特征。通过对主序列、分序列趋势曲线分别进行一元线性回归,得出三个异常衰减时段。分析异常时段与晚期强余震、外围区强震的对应关系。最后,结合b值、能量、频度等资料讨论1981年宁晋5.8级地震前的地震活动特征。
This paper uses the frequency and intensity data of Xingtai from 1965 to 1985, and uses one-dimensional random number time series statistical analysis to deduce the trend curve of N and N_3 with time. According to the anomalous morphology appearing in the post-1979 curve, the new seismic sequence features are analyzed. By performing a one-dimensional linear regression on the main sequence and sub-sequence trend curves respectively, three abnormal decay periods are obtained. The corresponding relationship between abnormal periods and strong strong aftershocks and peripheral strong earthquakes in the late period is analyzed. Finally, combining the b value, energy, frequency and other data to discuss the seismic activity before the 1981 Ningjin MS 5.8 earthquake.