【摘要】 基于中朝地台东北缘及邻区的综合地球物理资料 ,参考最新研究成果 ,编制了该区 0 .5°×0 .5°壳 -幔结构比值R等值线图 ,明确了该区R值分布与构造分区 ,表明R值变化特征与地震活动的关系 :地壳、岩石层厚度分布与地震活动的强度、频度无确定性关系 ;R值梯度带即岩石层变形带 ,可作为构造分区的参考依据 ;高R值强转折梯度带很可能是岩石层的剧烈变形带 ,多对应于地震高强度、高频度活动区 ;R值可作为地震区划、地震危险性评定、潜在震源区划分的值得参考的量化依据。更多还原

【Abstract】 Based on the previous and latest synthetic geophysical informations on the northeast margin and neighbouring area of Sino-Korean platform, the map of 0.5°×0.5° isolines of the crust-mantle structure ratio R in this area has been compiled. The relations between distribution of R value and geotectonic zoning, and varying characteristics of R value and intensity of seismic activity has been obtained. The results indicates that: (1)There is no definate relationship between thickness distribution of crust and lithosphere and intensity and frequency of seismic activities; (2)The gradient zone of R value is actually a deformed zone of the lithosphere, it could be regarded as an indicator for geotectonic zoning. An abrupt gradient zone with higher R values may be a radical deformed zone of the lithosphere , it mostly corresponds to an seismic active region with higher intensity and frequency; (3) R value could be taken as quantitative indicator of seismic zoning and seismic risk assessment and latent earthquake source area mapping.更多还原