大陆板内塑性流动波与地震迁移（二）

PLASTIC－FLOW WAVES AND EARTHQUAKE MIGRATION IN CONTINTAL PLATE（Ⅱ）

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。

Based on the concepts of plastic-flow network and plastic-flow waves in the continentallithosphere， 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 thetime-space distribution of earthquakes， there are at least two sorts of plastic-flow waves in thecentral 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-originatedtimes， wave-originated stages， and wave-crest belts，and different preferential propagation direc-tions and effective action ranges for each stage. The overlapping of the two sorts of wave-crestbelts 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 examin-ing 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 withthe corresponding earthquake magnitude ranges.