【摘要】 在华北地台的震旦系与下古生界中的固定层位中，赋存并呈区域性分布着泄水脉灰岩、泥质岩，它们是强地震时，距震中一定距离内未成岩的沉积物经受水平振动时产生的液化泄水构造，是鉴别地层中地震灾变事件的依据。华北地台东部及北部的震旦系和下古生界中可识别出２０个震积岩岩组，在地层柱中代表了６个地震活跃期，每个活跃期之间的周期长度为４０Ｍａ或３０Ｍａ节律，可能有某种具普遍规律性的意义。更多还原

【Abstract】 A series of micrite water escaped vein limestone and mudstone are formed regionally in some fixed horizons in Sinian and Paleozoic strata of the North China Platform. The micrite water escaped vein limestone possesses liquefaction water escaped structure which is formed in unconsolidated sediments under horizontal movement resulted from strong earthquake within certain distance of an epicenter. The micrite limestone may be used as one of the evidences to identify the seismitic catastrophe events happened in strata. 20 seismitic rock units are distinguished into Sinian and Lower Paleozoic in the eastern and northern parts of the North China Platform. They represent 6 seismitic active periods. The cycle rhythm of each period shows as much 40 Ma or 30 Ma, which is of some important significance.更多还原