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地质力学学报:2021,27(2):267-279
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上海罗店-周浦隐伏断裂第四纪活动性综合探测与研究
(1.同济大学海洋地质国家重点实验室, 上海 200092;2.上海市地矿工程勘察院, 上海 200072)
Quaternary activity of the Luodian-Zhoupu buried fault in the Shanghai region: Integrated exploration and research
(1.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;2.Shanghai Institute of Geological Engineering Exploration, Shanghai 200072, China)
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投稿时间:2020-10-30    修订日期:2021-01-15
中文摘要: 罗店-周浦断裂是纵贯上海市中心城区重要的北西向隐伏活动断裂,其第四纪活动性对城市地质安全至关重要。通过高精度重力勘探、浅层地震勘探及可控源大地音频电磁测深勘探等地球物理方法,结合钻探联井剖面及光释光年代学测定,对罗店-周浦断裂在区域内的展布特征及第四纪活动性进行了探测与研究。结果表明,该断裂在上海市南部区域仍具有较好的延展性,断裂行迹在重力剖面、可控源音频大地电磁测深剖面及浅层人工地震剖面上都有较好的反映。重力面积测量结果显示该断裂在上海市南部呈现为一组近平行断层行迹;浅层人工地震勘探与钻孔地层联合剖面揭露断层最浅上断点埋深相似(约为200 m),可控源大地音频电磁测深反映断裂深部特征明显。物探剖面及钻孔联合剖面综合显示,断裂并未明显错断上覆中更新统上部地层,结合光释光年代学标定,认为该断裂最新活动时代为早更新世。罗店-周浦断裂与区内历史地震事件关系密切,目前区域地应力环境为北西向压应力状态,该断裂易于发生张扭性活动,其活动性特征及地震危险性特征需要持续关注。
Abstract:The Luodian-Zhoupu fault is an important NW-trending buried active fault that runs through the downtown area of Shanghai City. Its Quaternary activity significantly affects the urban geological safety. We applied a set of integrated geophysical methods to carry out high-precision gravity, shallow seismic and controlled source audio magneto telluric (CSAMT) explorations in the study area, and studied the distribution pattern and activity level of the Luodian-Zhoupu fault, combining with joint borehole profile and optically stimulated luminescence chronology. The exploration results reveal good ductility of the fault in southern Shanghai, and the fault trace is well reflected in the profiles of gravity, CSAMT and shallow artificial seismicity. Gravity area measurements show that the fault appears as a group of nearly parallel fault tracks in southern Shanghai. The buried depths of the shallowest breakpoints researched by the shallow seismic exploration and joint borehole profile method are in good agreement (~200 m). TCSAMT profile displays obvious deep fault features. The research outcomes from the profiles with geophysical exploration and joint borehole indicate no obvious trace of the fault breaking into the overlying Middle Pleistocene, and it is believed that the latest active age of the fault is the Early Pleistocene referring to the result of optically stimulated luminescence dating. Since the Luodian-Zhoupu fault is closely related to regional historical seismic events, and the regional stress state is currently NW-compressive, with the fault prone to tensile and torsional activities, its activity and seismic risk characteristics require continuous attention.
文章编号:     中图分类号:P534.63    文献标志码:
基金项目:上海市财政资金项目(002021080001)
引用文本:
张浩,施刚,巫虹,等,2021.上海罗店-周浦隐伏断裂第四纪活动性综合探测与研究[J].地质力学学报,27(2):267-279.DOI:10.12090/j.issn.1006-6616.2021.27.02.025
ZHANG Hao,SHI Gang,WU Hong,et al,2021.Quaternary activity of the Luodian-Zhoupu buried fault in the Shanghai region: Integrated exploration and research[J].Journal of Geomechanics,27(2):267-279.DOI:10.12090/j.issn.1006-6616.2021.27.02.025

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