| 郯庐断裂带赤山段中晚更新世之交的史前地震遗迹 |
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| 引用本文： | 姚大全,汤有标,沈小七,陈安国,郑海刚,赵鹏,肖伟鹏,李光,郑颖平,李玲利.郯庐断裂带赤山段中晚更新世之交的史前地震遗迹[J].中国地震研究,2012,26(4):491-498. |
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| 作者姓名： | 姚大全 汤有标 沈小七 陈安国 郑海刚 赵鹏 肖伟鹏 李光 郑颖平 李玲利 |
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| 作者单位： | 安徽省地震局，合肥 230031;安徽省地震局，合肥 230031;安徽省地震局，合肥 230031;安徽省地震局，合肥 230031;安徽省地震局，合肥 230031;安徽省地震局，合肥 230031;安徽省地震局，合肥 230031;安徽省地震局，合肥 230031;安徽省地震局，合肥 230031;安徽省地震局，合肥 230031 |
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| 基金项目： | This paper is a contribution to Scientific Research Special Project of the Earthquake Calling（200808064）, Science and Technology Tackle Key Problem Plan Project of Anhui Province（08010302204） |
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| 摘 要： | Chishan is located in Sixian County of Anhui Province, and the west branch fault of Tancheng-Lujiang fault zone passes through here. According to previous research, the Chishan segment of Tancheng-Lujiang fault zone has been obviously active since the Quaternary. Trenches excavated perpendicular to the Chishan segment for this study have revealed many prehistoric earthquake ruins-the multi-phase reverse faulting colluvial wedge, which is represented as the western brick-red sandstone of the late Cretaceous or maize gravel stratum of the mid Pleistocene of the hanging wall of the fault overlapping eastward the mid-late Pleistocene brown clay. In the base of the wedges, steep NW-dipping faults were found, and the steep fault planes turned upward to gently dipping collapse planes. As revealed by the trenches, the connection line of the breaking points strikes NNE in general. Heaving landforms are preserved at most parts of the tailing edge of the hanging wall where the fault passes through, and some EW-trending gullies were offset by right-lateral faulting. The two walls of several trenches have consistently shown that the collapse of traces have been pushed by a west-to-east force. Among them, Tc1~Tc4 show that the brick red limestone(K2)overthrust and collapsed on the yellow-brown clay containing ferro-manganese nodules (Q2-3P); Tc5 reveals that the yellowish-white gravel (Q2P) and the sandstone (K2) and overthrust and collapsed on the aforementioned clay. Reverse faulting colluvial wedges are found on both walls of each of the 8 trenches, but the number of wedges revealed in different trenches is different: there is 1 wedge, and 2 wedges in Tc1 and Tc3. 3 wedges in Tc2, Tc4 and Tc5, and in individual trenches, few wedges are revealed. This may be related to the trench’s location, depth and height of the remaining denudation. From the analysis of the trenches and the thermoluminescence dating results, we can preliminarily conclude that multiple large-scale reverse faulting stick events have taken place on the Chishan segment of the Tancheng-Lujiang fault zone during the mid-late Pleistocene, that is to say, many pre-historic strong earthquakes have occurred.
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| 关 键 词： | Tancheng-Lujiang Fault zone Chishan Mid-late Pleistocene Prehistoric earthquake |
Prehistoric Earthquakes in the Chishan Segment of the Tancheng-Lujiang Fault Zone during the Mid-Late Pleistocene |
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| Yao Daquan,Tang Youbiao,Shen Xiaoqi,Chen Anguo,Zheng Haigang,Zhao Peng,Xiao Weipeng,Li Guang,Zheng Yinping and Li Lingli.Prehistoric Earthquakes in the Chishan Segment of the Tancheng-Lujiang Fault Zone during the Mid-Late Pleistocene[J].Earthquake Research in China,2012,26(4):491-498. |
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| Authors: | Yao Daquan Tang Youbiao Shen Xiaoqi Chen Anguo Zheng Haigang Zhao Peng Xiao Weipeng Li Guang Zheng Yinping and Li Lingli |
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| Institution: | Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China;Earthquake Administration of Anhui Province, Hefei 230031, China |
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| Abstract: | |
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| Keywords: | Tancheng-Lujiang Fault zone Chishan Mid-late Pleistocene Pre-historic earthquake |
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