关键词: 地震活动性, 盆地, 层析成像, 地幔涡旋, 塑性流动网络

Abstract: It is suggested on the basis of the vortical seismicity pattern and the distribution of large scale basins that a giant vortex tectonics exists in central eastern Asia,which is composed of the principal ring with diameter of about 2000km and some inner and outer branches,and the seismic activities migrate wavily along the vortex ring belts showing the propagation of vortex waves. The principal and inner rings rotate counter clockwise surrounding the Sichuan basin and the outer branches clockwise surrounding some large scale basins such as the Tarim basin. The evidence from seismic tomography indicates that the vortex tectonics is a consequence of the effect of upward mantle vortex on the base of lithospheric plate. The plate base driving force resulting from mantle vortex and the plate boundary driving force transmitted by plastic flow network,as two basic sources of driving forces,control the tectonic deformation and seismicities in the central eastern Asian continent. The“Vortex/Network”(Vor/Net) continental dynamic model provides a new approach to the studies of intraplate deformation,seismicity,and other geological geophysical processes.

Key words: Seismicity, Basin, Tomography, Mantle vortex, Plastic flow network