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本文采用一定的标准,对华北、川滇和甘宁地区1970至1981年震级为M_L≥3.0的地震空区进行了普查和分析,在25个地震空区图象中,在空区或其边缘发生中强以上地震(华北、甘宁取Ms≥5.0;川滇地区取Ms≥6.0)占空区总数44％,其余空区均因发生了一系列中小地震而瓦解。分析画出的空区外围环形带内地震频度变化特征,将有助于寻找与中强以上地震有关的空区。但是,无论如何,空区与未来中强以上地震发生的关系不是唯一的。
In this paper, we use a certain standard to conduct a survey and analysis of the earthquake-affected areas of magnitude M_L≥3.0 in North China, Sichuan, Yunnan and Gansu from 1970 to 1981. Among the 25 seismic images, Occurrence of strong earthquakes (North China, Gansu take Ms ≥ 5.0; Sichuan and Yunnan regions to take Ms ≥ 6.0) accounted for 44% of the total number of vacancies, the remaining vacant area due to the occurrence of a series of small and medium earthquakes and collapse. It is helpful to find out the vacant zone related to the above strong earthquakes by analyzing the characteristics of the frequency of the earthquakes in the annular zone around the vacant area. However, in any case, the relationship between the space zone and the future earthquakes above mid-level is not unique.