安丘-莒县断裂驸马营覆盖区第四纪活动特征  

QUATERNARY TECTONIC FEATURES OF THE FUMAYING HIDDEN AREA OF THE ANQIU-JUXIAN FAULT

作　　者：王雷[1,2,3] 许洪泰 王志才[1] 杨传成 张建民[1,3] 王冬雷[1,3] 夏暖 蔡明刚[2] 鲁人齐 任治坤[2] WANG Lei;XU Hong-tai;WANG Zhi-cai;YANG Chuan-cheng;ZHANG Jian-min;WANG Dong-lei;XIA Nuan;CAI Ming-gang;LU Ren-qi;REN Zhi-kun(Shandong Earthquake Agency,Jinan 250014,China;Institute of Geology,China Earthquake Administration,Beijing 100029,China;Earthquake Risk Prevention and Control Center of Shandong Province,Jinan 250021,China)

机构地区：[1]山东省地震局,济南250014 [2]中国地震局地质研究所,北京100029 [3]山东省震灾风险防治中心,济南250021

出　　处：《地震地质》2022年第5期1156-1171,共16页Seismology and Geology

基　　金：山东省地震局一般科研项目(YB2106);国家自然科学基金(41574066);中国地震局地质研究所基本科研业务专项(IGCEA1602);安丘-莒县活动断层(潍坊段)综合探测与地震灾害风险评估项目共同资助。

摘　　要：安丘-莒县断裂是中国东部重要的发震断裂,历史上发生过多次强震。为厘清该断裂安丘-昌邑段驸马营覆盖区的断裂特征,开展了地质地貌调查、浅层人工地震勘探、钻孔联合剖面探测和探槽开挖工作。文中获得了以下几点认识:1)地质地貌调查和浅震勘探结果表明,安丘-莒县断裂眉村-双官段可分为2支,分别为断裂西支F_(5-1)和东支F_(5-2),西支断裂F_(5-1)在丘陵东坡出露,东支断裂F_(5-2)隐伏于第四系中。2)驸马营覆盖区的钻孔探测结果表明,断裂东支F_(5-2)在钻孔Z_(4)和Z_(5)之间通过,上断点可推测延伸至层w_(2)全新统黑土湖组内部,埋深为4.2~6.9m,在黑土湖组底部取^(14)C贝壳样品^(14)C-1,其结果为(9.79±0.03)kaBP,表明东支断裂曾于全新世活动。3)在2支断裂之间沿东支断裂形成了长条形的第四纪盆地,东支F_(5-2)断裂西侧第四系发育较完整,岩心见下更新统、中更新统、上更新统和全新统;东侧仅沉积了上更新统和全新统,表明驸马营盆地在第四纪早期和中期一直接受沉积,具有断陷盆地的特点。4)安丘-莒县断裂的东支和西支在不同时期的活动强度存在差异,断裂东支F_(5-2)的驸马营隐伏段在第四纪早-中期活动强烈,晚第四纪以来仍有活动。经地质地貌调查发现,断裂西支F_(5-1)错断地质剖面晚更新世黄色粉土,断裂的最新活动时代为晚更新世。The Anqiu-Juxian Fault is an important seismogenic fault in the eastern China,along which many strong earthquakes occurred in history.From north to south,the fault can be divided into Anqiu section,Juxian-Tancheng section and Xinyi-Sihong section.According to the spatial distribution,occurrence and activity characteristics of the fault,the Anqiu section also can be divided into five sub-sections,which are the north of Changyi sub-section,the Changyi-Nanliu sub-section,the Anqiu-Mengtuan sub-section,the Qingfengling sub-section and the Mengyan sub-section.Since the late Quaternary,the activity of the Anqiu-Juxian Fault can be divided into two branches,namely,the west branch F_(5-1) and the east branch F_(5-2).There is a hidden area of the fault around Fumaying village,Weifang,Shandong Province.In order to find out the fault features of the hidden area on the Anqiu-Changyi segment of the fault,the geological-geomorphological investigation,shallow artificial seismic prospecting,combined drilling,trenching and OSL dating were carried out.Through the above work,we obtained the following understandings:1)The results of geological and geomorphological survey and shallow seismic profiles show that the Meicun-Shuangguan segment of Anqiu-Juxian Fault can also be divided into F_(5-1) and F_(5-2).The branch F_(5-2) of the fault is hidden in the Quaternary layers,and the west branch F_(5-1) exposes at the east slope of the hills.The area between the two branches of the fault is the Fumaying hidden area in this paper.2)The combined drilling section in the Fumaying hidden area shows that the east branch F_(5-2) passes through between the drillings Z_(4) and Z_(5),and the upper breakpoint can be inferred to extend to the interior of the layer w_(2) of Heituhu formation of Holocene series,buried at the depth of 4.2~6.9m.The shell was sampled as ^(14)C dating sample at the bottom of Heituhu formation,and the result from the sample No.^(14)C-1 is(9.79±0.03)kaBP,indicating that the latest active age of the east branch is the Holoce

关 键 词：安丘-莒县断裂 驸马营 覆盖区 断裂特征 

分 类 号：P315.2[天文地球—地震学]