山西平陆黄河北岸第四纪软沉积物变形构造的古地震成因研究  

The Paleoseismic Cause of Quaternary Soft-Sediment Deformation Structures on the North Bank of Yellow River, Pinglu, Shanxi

作　　者：史双双[1] 赵强 薄建杰[1] 韩晓飞[1] 张丽[1] 杨会丽[3] SHI Shuangshuang;ZHAO Qiang;BO Jianjie;HAN Xiaofei;ZHANG Li;YANG Huili(Shanxi Earthquake Agency,2 South-Shuixiguan Street,Taiyuan 030021,China;Shanxi Emergency Management Research Ceuter,1 West-Changfeng Streat Taiyuan 030006,China;State Key Laboratory of Earthquake Dynamics,Institute of Geology,CEA,A1 Huayanli,Beijing 100029,China)

机构地区：[1]山西省地震局,太原市030021 [2]山西省应急管理研究中心,太原市030006 [3]中国地震局地质研究所地震动力学国家重点实验室,北京市100029

出　　处：《大地测量与地球动力学》2019年第10期997-1001,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41702222);山西省青年基金(201701D221019);山西省地震局重点科技项目(SBK-1633,SBK-1932)~~

摘　　要：为研究山西南部平陆地区黄河北岸一级阶地中软沉积物变形构造的触发机制,对观测剖面中发育的碟状构造、液化卷曲构造和球枕构造等3类软沉积物变形构造的特征进行描述,分析其形成机制,通过总结对比软沉积物变形的地震成因,推测剖面中的变形构造为地震成因,并依此建立山西南部平陆地区的地震成因地层沉积序列。光释光测年结果显示,该变形构造形成年龄为1.9±0.2 ka,通过影响烈度的计算并结合山西及邻近省的地震资料发现,2次历史地震可能与该软沉积物变形构造相关。A geological section of soft-sediment deformation structures has been found in the strata of the first terrace of the north bank of the Yellow river in Pinglu area in Shanxi.There are three types of soft-sediment deformation structures in the observation section:dish structure,liquefied convolute structure,and ball-and-pillow structure.In order to study the triggering factor of the soft-sediment deformation structures in the study area,the three types of soft-sediment deformation structures are given detailed descriptions and their formation mechanisms are analyzed respectively.The criteria of the soft-sediment deformation structure triggered by earthquake factors are summarized.Through comprehensive comparison,it is indicated that the deformation structures in the section owe their genesis to paleoseismic events.The seismic sequence of Pinglu area in southern Shanxi is established.An optical chronology of the sediments in the section brackets the deformation induced by earthquakes at about 1.9±0.2 ka.Based on the influence intensity calculation and seismic data collected in Shanxi province and adjacent provinces,it is concluded that the two earthquakes may be related to the soft-sediment deformation structures in the section.

关 键 词：软沉积物变形构造 液化变形 地震成因 沉积序列 山西南部 

分 类 号：P315[天文地球—地震学]