| 综合物探方法在广西罗城县活动断裂鉴定中的应用 |
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| 引用本文： | 吴教兵,黎峻良,江兰,陆俊宏,潘黎黎,韦王秋.综合物探方法在广西罗城县活动断裂鉴定中的应用[J].物探与化探,2021(2):346-354. |
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| 作者姓名： | 吴教兵 黎峻良 江兰 陆俊宏 潘黎黎 韦王秋 |
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| 作者单位： | 广西壮族自治区地震局;深圳市龙岗地质勘查局;广东省珠海工程勘察院 |
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| 基金项目： | 广西科学研究与技术开发计划项目(桂科AB17195022,桂科AB18126040)。 |
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| 摘 要： | 城市活动断层探测在城市发展建设过程中和保障人民生命财产安全方面起到重要作用。本文以鉴定罗城断裂和上天桥—寺门断裂活动性为目的,在地震地质调查确定其断裂的几何学、运动学和年代学的基础上,选择第四系覆盖断裂最有可能活动的地段,重点采用高密度电法和地震映像方法来探测断裂在隐伏地段的具体位置,通过排钻验证,以及揭露其断裂与第四纪覆盖层之间的错断关系,来确定其断裂最新活动年代。结果表明,高密度电法和地震映像综合物探方法准确探测到了罗城断裂和上天桥—寺门断裂在隐伏地段的位置,且钻孔岩心中断裂面、断裂擦痕、断裂碎裂岩和构造角砾岩等发育,但断裂未错断第四系覆盖层,从而确定其断裂活动年代为早更新世。根据相关规范要求,罗城断裂和上天桥—寺门断裂全新世以来不活动,罗城县的建设规划可不采取避让措施,该鉴定结果为今后罗城县的工程建设提供了安全保障。
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| 关 键 词： | 活动断裂 地震地质调查 高密度电法 地震映像 排钻 |
The application of comprehensive geophysical method to the identification of active faults in Luocheng County,Guangxi |
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| WU Jiao-Bing,LI Jun-Liang,JIANG Lan,LU Jun-Hong,PAN Li-Li,WEI Wang-Qiu.The application of comprehensive geophysical method to the identification of active faults in Luocheng County,Guangxi[J].Geophysical and Geochemical Exploration,2021(2):346-354. |
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| Authors: | WU Jiao-Bing LI Jun-Liang JIANG Lan LU Jun-Hong PAN Li-Li WEI Wang-Qiu |
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| Institution: | (Earthquake Administration of the Guangxi Zhuang Autonomous Region,Nanning 530022,China;Shenzhen Longgang Geological Exploration Bureau,Shenzhen 518100,China;Zhuhai Engineering Exploration Institute of Guangdong,Zhuhai 519002,China) |
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| Abstract: | Urban active fault detection plays an important role in the process of urban development and construction and also in ensuring the safety of people's lives and property.In this paper,with the purpose of identifying the activity of Luocheng fault and Shangtianqiao-Simen fault and on the basis of geometry,kinematics and chronology of the fault determined by the seismic geological survey,the authors detected the specific location of the fault that lies at the most likely active segment and is covered by the Quaternary sediments by high-density electrical method and seismic imaging method,which was then verified by drilling arrangement.In addition,the latest active age of the fault was determined through the offset relationship between the fault and the Quaternary overburden.The results show that the location of Luocheng fault and Shangtianqiao-Simen fault in the concealed segment can be accurately detected by the high-density electrical methods and seismic mapping method,and the fault activity age is determined to be the early Pleistocene based on the fact that fracture surface,scratch,cataclasite and structural brecciaa are developed,but the fault does not cut the Quaternary overburden.According to the requirements of relevant specifications,Luocheng fault and Shangtianqiao-Simen fault have not been active since the late Pleistocene,so the construction planning of Luocheng county does not need to take avoidance measures,and the appraisal results provide safety guarantee for the project construction of Luocheng County in the future. |
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| Keywords: | active fault seismic geological survey high density electrical method seismic imaging drilling arrangement |
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