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郯庐断裂带五河-明光段晚更新世活动的地质证据及活动特征
疏鹏,方良好,郑颖平,路硕,潘浩波,宋方敏,李胜强
作者单位
疏鹏 安徽省地震局, 合肥 230031 
方良好 安徽省地震局, 合肥 230031 
郑颖平 安徽省地震局, 合肥 230031 
路硕 安徽省地震局, 合肥 230031 
潘浩波 安徽省地震局, 合肥 230031 
宋方敏 中国地震局地质研究所, 北京 100029 
李胜强 河北省地震局, 石家庄 050021 
摘要:
作为中国东部影响最大的走滑断裂,郯庐断裂因其强烈的地震活动性及沿断裂带一系列的大地震而备受学者关注。然而,大部分的调查研究都是针对郯庐断裂山东省境内及渤海湾内部分段落。并且,一般认为淮河以南的段落晚更新世以来不活动,也不具备孕育大震或强震的条件。然而,近期我们针对郯庐断裂的工作对这些认识提出了质疑,这些工作基于高分辨率卫星遥感影像解译和在安徽北部明光市、五河县附近的详细的野外调查。我们的研究认为郯庐断裂在淮河以南的五河-明光段包括四支断裂,并且至少一支在晚更新世以来活动。此段在晚第四纪以来主要以右旋走滑为主。不同于常常在基岩及第四纪沉积物中观察到的断层,在未固结的第四纪粘土中的断层形迹不清,但是能够被微观构造分析所确认。鉴于我们最近的工作和前人研究,我们认为年轻沉积物中的隐形断层更加值得注意,同时我们认为郯庐断裂淮河以南的“平静”段需要更深入的研究。
关键词:  郯庐断裂  淮河以南  五河-明光段  地质证据  显微构造  晚更新世
DOI:
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基金项目:
Geological Evidence and Characteristics of Activity of the Wuhe-Mingguang Section of Tancheng-Lujiang Fault Zone in Late Pleistocene
Shu Peng,Fang Lianghao,Zheng Yingping,Lu Shuo,Pan Haobo,Song Fangmin,Li Shengqiang
Abstract:
As the most influential strike-slip fault in East China, the Tancheng-Lujiang fault zone draws scholar's attention for its strong seismic activity. Nevertheless, most research has been conducted along segments in Shandong Province and Bohai Bay where huge earthquakes occur frequently. Meanwhile, it is generally believed that segments lying to the south of Huaihe River have been inactive since the late Quaternary and thus it is incapable of generating moderate or strong earthquakes. However, these understandings about the Tancheng-Lujiang fault have been questioned by our recent work for part of the fault south to the Huaihe River. Based on interpretation of high-resolution satellite images, detailed field investigations near Wuhe county and Mingguang City in northern Anhui Province and elaborate microstructure analysis, we come to the conclusion that the Tancheng-Lujiang fault zone mainly consists of four branches and at least one should be active since the late Pleistocene for the Wuhe-Mingguang section. This segment is monopolized by dextral strike-slip motion in late Quaternary. Different from obvious faults in bed rocks or consolidated sediments, the latest activity trace in Quaternary loose sediment revealed by trench excavation is not obvious or even invisible to visual observation. According to our recent work and previous studies, we call for more attention to be paid to invisible faults in young sediment and also suggest that more research be conducted along this seemingly placid segment.
Key words:  Tancheng-Lujiang fault zone  South of Huaihe River  Wuhe-Mingguang segment  Microstructure  Late Pleistocene