白鹤滩水电站库区小江断裂带活动性研究
发布时间：2018-07-21 10:28
【摘要】：小江断裂带北段为白鹤滩水电站库区内规模最大的断裂构造,其几何展布特征与活动性对库区移民及其就近安置规划有明显的制约作用。通过对小江断裂北段大比例尺调查、断裂带石英形貌扫描以及现场氡气测量等综合研究,重新界定了小江断裂带北段展布,即北起宁南县华弹镇,沿金沙江左岸经永乐村,鲁吉、溜姑延伸至蒙姑以南,断裂带总体向西陡倾。石英微形貌统计分析与应力痕迹微形貌观察结果表明,断层强烈活动时间在晚更新世,同一石英颗粒表面具有代表两种滑动方式(蠕滑和黏滑)的应力痕迹组合,应力痕迹的溶蚀程度、叠加和切割关系表明,断层在晚更新世的滑动至少有3个亚期次,早期为蠕滑,中晚期为黏滑。小江断裂北段的潜在地震危险性评估表明,其可能发生强震的最大震级约在MS6.8级~MS7.1级左右,为未来仍有可能再次活动的强震地区。
[Abstract]:The northern section of the Xiaojiang fault zone is the largest fault structure in the reservoir area of Baihetan Hydropower Station. The geometric distribution and activity of the fault zone have a significant effect on the resettlement planning of the reservoir area and its nearby settlement. Based on the investigation of large scale in the northern section of Xiaojiang fault, the comprehensive study of quartz morphology scanning and radon measurement in the fault zone, the distribution of the north section of the Xiaojiang fault zone is redefined, that is, the town of Huaming, Ningnan County, and the left bank of Jinsha River through Yongle Village. Luji, extending to the south of Menggu, the fault zone generally steeply to the west. The statistical analysis of quartz micromorphology and the observation of stress trace micromorphology show that the strong activity time of the fault occurred in the late Pleistocene, and the same quartz grain surface has two stress trace combinations representing two sliding modes (creep and slippage). The dissolution degree of stress trace, superposition and cutting relationship indicate that the slip of the fault in the late Pleistocene has at least three substages, which are creeping at the early stage and viscous slip in the middle and late stages. The potential earthquake risk assessment of the northern section of Xiaojiang fault shows that the maximum magnitude of the possible strong earthquake is about MS6.8 and MS7.1, which is a strong earthquake area where it is still possible to be active again in the future.
【作者单位】： 地质灾害防治与地质环境保护国家重点实验室(成都理工大学);
【基金】：国家自然科学基金(41521002,41072231) 中国地调局项目(1212011220154) 地质灾害防治与地质环境保护国家重点实验室自主课题基金(SKLGP2015Z001)资助
【分类号】：P315.5
[Abstract]:The northern section of the Xiaojiang fault zone is the largest fault structure in the reservoir area of Baihetan Hydropower Station. The geometric distribution and activity of the fault zone have a significant effect on the resettlement planning of the reservoir area and its nearby settlement. Based on the investigation of large scale in the northern section of Xiaojiang fault, the comprehensive study of quartz morphology scanning and radon measurement in the fault zone, the distribution of the north section of the Xiaojiang fault zone is redefined, that is, the town of Huaming, Ningnan County, and the left bank of Jinsha River through Yongle Village. Luji, extending to the south of Menggu, the fault zone generally steeply to the west. The statistical analysis of quartz micromorphology and the observation of stress trace micromorphology show that the strong activity time of the fault occurred in the late Pleistocene, and the same quartz grain surface has two stress trace combinations representing two sliding modes (creep and slippage). The dissolution degree of stress trace, superposition and cutting relationship indicate that the slip of the fault in the late Pleistocene has at least three substages, which are creeping at the early stage and viscous slip in the middle and late stages. The potential earthquake risk assessment of the northern section of Xiaojiang fault shows that the maximum magnitude of the possible strong earthquake is about MS6.8 and MS7.1, which is a strong earthquake area where it is still possible to be active again in the future.
【作者单位】： 地质灾害防治与地质环境保护国家重点实验室(成都理工大学);
【基金】：国家自然科学基金(41521002,41072231) 中国地调局项目(1212011220154) 地质灾害防治与地质环境保护国家重点实验室自主课题基金(SKLGP2015Z001)资助
【分类号】：P315.5
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