肃北地区党河南山断裂典型地貌及探槽分析  

TYPICAL LANDFORM PHENOMENA AND TRENCH EXPLORATION ANALYSIS OF DANGHENANSHAN FAULT IN SUBEI REGION

作　　者：赵朋[1] 闵伟[2] 疏鹏 何康[1] ZHAO Peng;MIN Wei;SHU Peng;HE Kang(Anhui Earthquake Agency,Hefei 230031,Anhui,China;Institute of Geology,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]安徽省地震局,安徽合肥230031 [2]中国地震局地质研究所,北京100029

出　　处：《内陆地震》2024年第4期315-322,共8页Inland Earthquake

基　　金：国家科技支撑计划项目(2006BAC13B01);地震科技星火计划攻关项目(XH24021C);郯庐断裂带中段位错丛集及破裂特征研究(MENGO-202215)。

摘　　要：通过对党河南山断裂开展野外地质地貌调查、探槽开挖等工作,发现沿北侧断层发育多级断层陡坎。最新陡坎错断冲沟的河漫滩,同时断层西段伴有褶皱活动。在大红沟沟口开挖的地质探槽显示断层错断较新的砾石层,样品测试结果表明断裂最新活动时代至少为全新世中期。2个探槽揭示了同一次地震事件,该事件发生在(4.69±0.40)ka BP之后。Through the field geological and geomorphological survey and trench excavation of the Danghe nanshan fault,it is found that multi-level fault scarps are developed along the north side of the fault,and the latest scarps break the floodplain of the gully,while the west section of the fault is accompanied by fold activity;The geological exploration trench excavated at the mouth of Dahonggou gully shows that the fault has dislocated a relatively new gravel layer.The sample test results show that the latest active age of the fault is at least the middle Holocene;Two trenches revealed the same seismic event,which occurred after(4.69±0.40)ka BP.

关 键 词：肃北地区 党河南山断裂 陡坎 全新世中期 

分 类 号：P315.7[天文地球—地震学]