关键词: 塑性流动网络, 塑性流动波, 波峰带, 地震迁移

Abstract: The results of our studies show that the spatbial distribution of earthquakes in continent iscontrolled mainly by the plastic-flow network in the lower lithosphere which is reponsible for theintraplate long-range energy transmission, while the migration of earthquakes depends mainlyon the propagation of the plastic-flow waves similar to tidal bores advancing. Based on the analysis of the time-space distribution of earthquakes, in the central-eastern Asian plastic-flow network system with the Himalayan collision zone to be its driven boundary there are at least twosorts of plastic-flow waves, the 1st- and 2nd-velocity waves, or called " century-wave"and"decade-wave " respectively, which propagate with different velocities. The along-seismic-beltcomponents of the propagation velocities are about 1～7 km/a and 12～45 km/a, respectively,and the intervals of wave-originated times at the plate boundary for them are 68～133a(93.7aon average)and 7～18a(10.8a on average), respectively, showing quasi-periodicity. One moving wave-crest belt is produced for each wave-originated stage, which provides a necessary condition in energy background for the occurrence of earthquakes. The plastic-flow waves here are viscoplastic deformation waves propagating mainly in the lower lithosphere and induced under thecombinative actions of plate boundary compression and intraplate gravity potential. The conceptof plastic-flow waves can not only reasonably explain the physical mechanism of earthquake migration, but also gives an important basis for earthquake prediction considering the condition ofenergy background.

Key words: Plastic-flow network, Plastic-flow wave, Wave-crest belt, Earthquake migration