中国东部大陆岩石层壳──幔结构比值R与动力学特征

根据前人和作者最新深部地球物理探测研究成果，完成了中国东部大陆（１０５°Ｅ以东）１°×１°壳－幔结构比值Ｒ（Ｒ＝Ｃ／Ｌ，Ｃ为地壳厚度，Ｌ为岩石层厚度）分布图的编绘．研究了Ｒ值分布与东部大陆岩石层分块、大地构造形态特征；Ｒ值分布与东部大陆地震活动的非均匀性特征；Ｒ值分布的动力学内涵．结果表明：１．Ｒ值等值线特征反映了岩石层块体划分、大地构造形态，Ｒ值特征与岩石层块体划分、大地构造形态有其深部成因上的联系；２．高Ｒ值区对应地震高活动区，因而Ｒ值可作为地震区划、地震危险性评定的定量指标，Ｒ值是地震活动的动力因子．

THE CONTINENTAL LITHOSPHERE CRUST-MANTLESTRUCTURE RATIO VALUE R AND DYNAMIC CHARACTERISTICS IN THE EASTERN PART OF CHINA

Baced on the latest achievements of research on Geophysical deep exploration,the distribution map of the crust-mantle structural ratio value R（1°×1°）of the continental lithosphere in the eastern part of China（to the east of 105°E） has been complied the following contents have been studied:1.the distribution of R value and characteristics of lithospheric block zoning and geotectonic conformation in the eastern Chinese mainland;2.the distribution of R value and the heterogeneity of seismic activity in eastern China;3.the dynamic implications of R value.The results show:1.the characteristics of R value lsolines indicate that it has a close relation to the lithospheric block zoning,geotectonic conformation and characterstics of R value on deep genesis.2.The high R value areas are corresponding to the highly seismic regions,so R value can be taken as a quantitative indicator of seismic zoning and seismic risk assessment.R value is an dynamical factor ofseismic activity.