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New Activity of the Tanlu Fault Zone in the South of Huaihe to the Nvshanhu Segment since the Late Quaternary
Yao Daquan,Zheng Haigang,Zhao Peng,Yang Yuanyuan,Wang Xingzhou,Miao Peng,Fang Zhen,Tao Yuechao,Li Junhui,Wang Jun,Wang Xiaoli
作者单位
Yao Daquan Earthquake Administration of Anhui Province, Hefei 230031, China 
Zheng Haigang Earthquake Administration of Anhui Province, Hefei 230031, China 
Zhao Peng Earthquake Administration of Anhui Province, Hefei 230031, China 
Yang Yuanyuan Earthquake Administration of Anhui Province, Hefei 230031, China 
Wang Xingzhou Earthquake Administration of Anhui Province, Hefei 230031, China 
Miao Peng Earthquake Administration of Anhui Province, Hefei 230031, China 
Fang Zhen Earthquake Administration of Anhui Province, Hefei 230031, China 
Tao Yuechao Earthquake Administration of Anhui Province, Hefei 230031, China 
Li Junhui Earthquake Administration of Anhui Province, Hefei 230031, China 
Wang Jun Earthquake Administration of Anhui Province, Hefei 230031, China 
Wang Xiaoli Earthquake Administration of Anhui Province, Hefei 230031, China 
摘要:
Taking the Huaihe to the Nvshanhu segment of the Tanlu (Tancheng-Lujiang) fault zone as the main research target to explore whether there has been new activity since the late Quaternary, and based on the interpretation of remote sensing images and repeated surface investigations, we excavated trenches at the sections where the tectonic landform is significant, identified and recorded the deformation patterns of the fault and analyzed the activity behavior. Samples of new activity and deformation were collected and oriented slices were ground based on the samples' original state to make the micro structural analysis and demonstration. All of the above research shows very clear linear tectonic geomorphology along the fault, three trenches across the fault zone all revealed new deformation traces since late Quaternary. The latest stratum dislocated by the fault is the late Quaternary and Holocene. The main slip mode is stick slip, as represented typically by fault scarps, wedge accumulation, the faults and the filled cracks and so on. In general, it shows the characteristics of brittle high-speed deformation and belongs to the prehistoric earthquake ruins. The above understanding was confirmed partially by microscopic analysis. In addition, the similarities and differences and the possible reasons for the characteristics of the latest activities of the Tancheng-Lujiang fault zone in the north and south of the Huaihe River regions are also discussed in this paper.
关键词:  Tanlu fault zone  South of Huaihe-Nvshanhu  Late Quaternary  New activity characteristics
DOI:
分类号:
基金项目:This project was jointly funded by the Anhui provincial geological public-welfare project "New Activities of Quaternary and Medium Velocity Structure Exploration and Evaluation for Key Sections of the Tan-Lu Fault Zone (the Anhui segment)" (2015-g-25) and the project of "3-D Seismic Section Model and Earthquake Prediction Research in the Tanlu Fault Zone",China Earthquake Administration (TYZ20160101).
New Activity of the Tanlu Fault Zone in the South of Huaihe to the Nvshanhu Segment since the Late Quaternary
Yao Daquan,Zheng Haigang,Zhao Peng,Yang Yuanyuan,Wang Xingzhou,Miao Peng,Fang Zhen,Tao Yuechao,Li Junhui,Wang Jun,Wang Xiaoli
Abstract:
Taking the Huaihe to the Nvshanhu segment of the Tanlu (Tancheng-Lujiang) fault zone as the main research target to explore whether there has been new activity since the late Quaternary, and based on the interpretation of remote sensing images and repeated surface investigations, we excavated trenches at the sections where the tectonic landform is significant, identified and recorded the deformation patterns of the fault and analyzed the activity behavior. Samples of new activity and deformation were collected and oriented slices were ground based on the samples' original state to make the micro structural analysis and demonstration. All of the above research shows very clear linear tectonic geomorphology along the fault, three trenches across the fault zone all revealed new deformation traces since late Quaternary. The latest stratum dislocated by the fault is the late Quaternary and Holocene. The main slip mode is stick slip, as represented typically by fault scarps, wedge accumulation, the faults and the filled cracks and so on. In general, it shows the characteristics of brittle high-speed deformation and belongs to the prehistoric earthquake ruins. The above understanding was confirmed partially by microscopic analysis. In addition, the similarities and differences and the possible reasons for the characteristics of the latest activities of the Tancheng-Lujiang fault zone in the north and south of the Huaihe River regions are also discussed in this paper.
Key words:  Tanlu fault zone  South of Huaihe-Nvshanhu  Late Quaternary  New activity characteristics