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一个强震的发生以确切的必然导致其发生的那些孕震前兆异常开始到强震发生会延续多长时间呢?换句话说,强震发生的必然前兆一般出现在多大时间区间内? 对这个问题通过不同途径研究人们有各种认识:有人认为一个强震孕育期达几百年甚至几千年之久;在日本有人经研究后认为8级以上强震前兆异常可以在30—50年前出现,其根据就是强震前的地形变测量资料;更多人通过各种前兆手段综合探索认为7—8级强震前3—5年会在震源区不同范围内出现较多的前兆异常变化。
The occurrence of a strong earthquake to the exact cause of the earthquake precursory anomalies that start to the occurrence of strong earthquakes will continue for how long? In other words, the necessary precursors of the occurrence of strong earthquakes generally appear in the time interval? To this There are various ways in which the problem can be studied by people. Some people think that a strong earthquake has a period of several hundred years or even thousands of years. In Japan, some people think that the precursory anomalies of earthquakes above M8 can occur 30-50 years ago According to the data of the terrain deformation before the strong earthquakes, more people probed comprehensively that there were more anomalous precursory changes in different regions of the source region in the 3-5 years before the M = 7-8 earthquakes .