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本文在《地震空区与逼近地震》一文(以下简称“上篇”)的基础上,分析了1970—1980年间我国大陆上所有资料较完整的6.0级以上的地震,以及60年代的两次7级以上地震的震例.结果表明,上篇所得的关于背景空区、孕震空区及逼近地震的结论具有普遍意义.本文在大量资料的基础上,充实了上篇论文的内容,并重新计算了上篇所得的经验公式.本篇指出,判别孕震空区有三个标志:(1)随着孕震空区的形成,空区及邻近区域的地震应变释放应出现加速;(2)孕震空区内外地震频度比(N_外+1)/(N_内+1)在孕震空区的形成过程中应出现峰值;(3)在背景空区形成前,未来主震震源区内常常发生一些中等强度的早期前震.此外,本文发现在孕震空区形成的过程中,孕震空区及其邻近区域的地震所释放能量的1/3次方的和 ∑E~(1/3)与孕震空区长轴的对数线性相关,所得经验公式可作为发生逼近地震的时间判据.最后本文讨论了孕震空区尺度的物理解释和逼近地震的成因.
Based on the article “Earthquake Void and Approaching Earthquake” (hereinafter referred to as “the first part”), this paper analyzes all the earthquakes with magnitude more than 6.0 in China from 1970 to 1980 and the earthquakes with magnitude more than 6.0 in the 1960s Above earthquakes.The results show that the conclusions obtained in the first part are of general significance for the background empty area, the pregnant earth empty area and the approaching earthquake.This paper enriches the content of the previous paper based on a large amount of data, (1) With the formation of pregnant vacant space, the release of seismic strain in the open space and the adjacent area should be accelerated; (2) The seismic frequency ratio (N_external +1) / (N_high + 1) within and outside the geosyncline area should peak during the formation of the geosyncline. (3) Before the formation of the background vacancy, the future main shock Some moderate-intensity early foreshocks often occur in the source area.In addition, we find that in the process of the formation of the pregnant lost area, the sum of the third-order energies of ΣE ~ (1/3) is logarithmically linear with the logarithm of the major axis of the pregnant lost seashore, and the empirical formula obtained can be used as an approximation Finally, this paper discusses the physical interpretation of the size of the pregnant lost zone and the origin of the approach to the earthquake.