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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。
In the Sinian system of North China Platform and the fixed layers in the Lower Paleozoic, there are diagenetic veins limestone and argillaceous rock distributed in the area, which are strong earthquakes and are not formed within a certain distance from the epicenter The liquefaction and drainage structure of rock sediments when subjected to horizontal vibration is the basis for identifying the events of seismic catastrophic events in the strata. 20 seismite rocks can be identified in the Sinian and Lower Paleozoic in the eastern and northern parts of North China Platform, representing 6 active phases in the column, each with a period of 40Ma Or 30Ma rhythm, there may be some sort of universal regularity.