Abstract: Based on the concepts of plastic-flow network and plastic-flow waves in the continental lithosphere, migration of earthquakes is essentially their moving along”plastic-flow/seismic”belts in network system controlled by the plastic-flow waves. In terms of the inference from the time-space distribution of earthquakes, there are at least two sorts of plastic-flow waves in the central and eastern Asian network svstem, such as the“decade-wave” and” century-wave” in-volving the interrnediate-range prediction of earthquakes. They are of different wave-originated times, wave-originated stages, and wave-crest belts,and different preferential propagation directions and effective action ranges for each stage. The overlapping of the two sorts of wave-crest belts forms the double wave-crest areas in which the portion covered by ” plastic-flow/seismic”belts becomes the energy background areas necessary for earthquakes. It is indicated by examining the situation in 1976 that about 90% of 19 earthquakes with magnitudes ranging 6.0 to 7.9,or about 83%of 6 groups of these earthquakes,distribute in the energy background areas with the corresponding earthquake magnitude ranges.

Key words: Continental plate, Earthquake migration, Medium-term prediction, Plastic-flow Network, Plastic-flow wave, Energy background area

摘要： 基于大陆岩石圈塑性流动网络和塑性流动波的观念,地震迁移主要表现为塑性流动波控制下地震沿网带的迁移。中东亚网络系统存在着两种以上的塑性流动波,其中与地震中期预测有关的是“十年波”和“百年波”.它们具有不同的起波年份、起波期和波峰带,而各期波的优势传播方向和有效作用范围又有所不同。两种波的波峰带相互叠合形成双重波峰区,其中有“塑性流动-地震”网带经过的区段为地震提供必要的能量背景条件,构成能量背景区。对中国大陆1976年震情的检验表明,6.0～7.8级地震共19次,约有90%分布在相应震级范围的能量背景区内。

关键词: 大陆板块, 地震迁移, 中期预报, 塑性流动网络, 塑性流动波, 能量背景区