| 甘孜-玉树断裂带东南段晚第四纪活动性研究 |
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| 引用本文： | 石峰,李安,杨晓平,徐锡伟,何宏林.甘孜-玉树断裂带东南段晚第四纪活动性研究[J].地震地质,2013,35(1):50-63. |
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| 作者姓名： | 石峰 李安 杨晓平 徐锡伟 何宏林 |
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| 作者单位： | 中国地震局地质研究所,活动构造与火山重点实验室 |
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| 基金项目： | 中国地震局玉树地震科学考察项目;财政部重大专项“我国地震重点监视防御区活动断层地震危险性评价”(201108001)共同资助 |
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| 摘 要： | 以甘孜-玉树断裂带东南段的地质地貌为研究对象,在遥感解译的基础上,通过对典型地区的详细野外调查和探槽研究对该段晚第四纪活动性进行研究。在断裂沿线的生康乡、仁果乡、错阿乡、日阿乡进行了断错地貌分析和晚第四纪滑动速率计算, 生康区的水平滑动速率为(7.6±0.5)mm/a, 垂直滑动速率为(1.1±0.1)mm/a; 仁果区的水平滑动速率为(8.0±0.3)mm/a,垂直滑动速率为(1.1±0.1)mm/a; 错阿区的水平滑动速率为(10.3±0.4)mm/a; 日阿区的水平滑动速率为(10.8±0.8)mm/a, 垂直滑动速率为(1.1±0.1)mm/a。在仁果乡和错阿乡进行了探槽研究,两处探槽都揭示了多次古地震事件,虽然揭露的断层构造样式有所不同,但总体上都是以走滑为主兼有一定的逆冲分量。综合古地震事件和滑动速率分析表明,甘孜-玉树断裂带东南段晚第四纪尤其是全新世以来活动剧烈。
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| 关 键 词： | 甘孜-玉树断裂带东南段 晚第四纪活动性 滑动速率 构造样式 |
| 收稿时间： | 2012-03-28 |
| 修稿时间： | 2012-06-06 |
RESEARCH ON LATE QUATERNARY ACTIVITY OF THE SOUTHEASTERN SEGMENT OF GANZI-YUSHU FAULT ZONE |
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| SHI Feng,LI An,YANG Xiaoping,XU Xiwei,HE Honglin.RESEARCH ON LATE QUATERNARY ACTIVITY OF THE SOUTHEASTERN SEGMENT OF GANZI-YUSHU FAULT ZONE[J].Seismology and Geology,2013,35(1):50-63. |
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| Authors: | SHI Feng LI An YANG Xiaoping XU Xiwei HE Honglin |
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| Affiliation: | (Key Laboratory of Active Tectonics and Volcomoes,Institute of Geology, China Earthquake Administration,Beijing 100029, China) |
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| Abstract: | Taking tectonic geomorphology of southeastern Ganzi-Yushu Fault zone as the research object,and based on remote sensing interpretation,the paper investigates the late Quaternary activity of the southeastern segment of Ganzi-Yushu Fault zone through trenching and detailed field investigation on several typical sites. We analyze the landscapes and calculate the late Quaternary slip rates along the fault zone at the sites in Shengkang township,Renguo township,Cuoa township,and Ria township,respectively.The horizontal and vertical slip rates are (7.6?0.5)mm/a and (1.1?0.1)mm/a at Shengkang township,(8.0?0.3)mm/a and (1.1?0.1)mm/a at Renguo township. And horizontal slip rate of Cuoa township is (10.3?0.4)mm/a.The horizontal and vertical slip rates of Ria township are (10.8?0.8)mm/a and (1.1?0.1)mm/a,respectively. Both trenches at Renguo township and Cuoa township have revealed several paleoearthquake events. Though there are some differences in fault tectonic styles revealed between the two trenches,the fault motion on this segment is of strike-slip with a certain amount of thrust component on the whole. Associated with the analysis of paleoearthquake events and slip rate,it is found that the southeastern Ganzi-Yushu Fault zone is subject to intensive activity since late Quaternary,especially since Holocene. |
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| Keywords: | southeastern segment of Ganzi-Yushu Fault zone late Quaternary activity slip rate tectonic style |
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