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地震发生的时间特征人们已讨论得很多,但都偏重于中长期,所选取的时间尺度较大。1977年某些作者曾指出:有些地区相继发生的地震时间间隔也有倍九天的特点,虽然并非所有地震都是如此,但至少可以说在地震序列中有倍九的一些“迹象”。基于上述的研究,我们选取了地震活动比较强烈的青藏高原作为统计区,对发生在该区的6.0级和6.0级以上地震进行倍九时间特征的统计,以作为今后予报地震时的参考。下面分两种情况来讨论。
The time characteristics of earthquakes have been discussed many people, but are biased in the long term, the selected time scale larger. Some authors in 1977 pointed out that the succession of earthquakes in some areas is also characterized by a ninefold time interval. Although not all the earthquakes are true, it can be said that there are at least some “signs” of a factor of nine in the earthquake sequence. Based on the above studies, we selected the Qinghai-Xizang Plateau where the seismicity is relatively strong as the statistical area, and collected the statistics of the times of 9 times for the earthquakes of magnitude 6.0 and above 6.0 that occurred in this area to be used as the reference for future earthquake reporting. The following two situations to discuss.