河北宽城高于庄组震积岩与古地震发生频率  

Seismites and Ancient Earthquake Frequency in Gaoyuzhuang Formation of Kuancheng in Hebei Province

作　　者：郑秀才[1] 

机构地区：[1]长江大学工程技术学院,湖北荆州434020

出　　处：《长江大学学报（自科版）（中旬）》2016年第4期22-29,3,共8页Journal of Yangtze University(Nature Science Edition)

基　　金：中国石油化工有限股份公司海相前瞻性研究项目(YPH08026)

摘　　要：河北宽城中元古界高于庄组发育一系列特征明显的震积岩，包括液化变形（底辟、液化脉及液化卷曲等构造）、挤压变形（板刺状角砾和丘一槽构造等）、拉伸变形（环状构造）以及脆性变形（层间小断层）。上述变形集中发育在组内第2段、第5段和第9段，代表了3个地震活跃期，地震活跃期的间隔（地震节律）约为13Ma，每个地震活跃期的持续时间约为3．5Ma，13Ma地震节律反映了燕山裂陷槽轴部同生断裂活动规律。利用液化最大震中距估算出的震级为6～7级。A series of distinctive tectonic characters of seismites were developed in Mesoproterozoic Gaoyuzhuang Formation in Kuancheng Area of Hebei Province,which included liquefaction deformation(diapirs,liquefied veins and liquefied curl),extrusion deformation(planar-spiny breccia and hillock-trough sructure),tensile deformation(circular layer)and brittle deformation(small faults between layers).Most of relative seismites were concentrated in the second,fifth and ninth stratigraphic segments which represented three seismic active times.The interval of seismic active time(earthquake rhythm)was 13 Ma,each of seismic active duration was about 3.5Ma.The 13 Ma of earthquake rhythm reflected the contemporaneous fault regularity of trough axis on Yanshan rift.According to the second segment of seismite frequency,it can primarily estimate that the ancient seismic frequency is about 0.15 Ma.By utilizing the relationship of magnitude and the largest liquefied epicenter distance,the estimated magnitude is 6to 7.

关 键 词：震积岩 地震节律 中元古代高于庄组 河北宽城 

分 类 号：P512.2[天文地球—地质学]