| 浅层人工地震和地质雷达在城市活动断层探测中的联合应用?以鹤壁市汤东断裂为例 |
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| 引用本文： | 彭白,苏鹏,鲁人齐,蔡明刚,郝重涛,刘冠伸.浅层人工地震和地质雷达在城市活动断层探测中的联合应用?以鹤壁市汤东断裂为例[J].震灾防御技术,2022,17(2):269-277. |
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| 作者姓名： | 彭白 苏鹏 鲁人齐 蔡明刚 郝重涛 刘冠伸 |
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| 作者单位： | 1.中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029 |
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| 基金项目： | 中央公益性科研院所基本科研业务专项（IGCEA1902）；山西太原大陆裂谷动力学国家野外科学观测研究站研究课题（NORSTY20-03）；国家自然科学基金项目（42174075） |
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| 摘 要： | 浅层人工地震勘探是探查城市隐伏活动断层最有效的手段之一，然而受近地表探测盲区和探测分辨率的限制，该方法难以获取活动断层超浅层上断点的准确埋深位置。地质雷达探测方法在一定程度上可弥补浅层人工地震勘探的不足。为探索浅层人工地震勘探和地质雷达探测的联合应用效果，分析其在城市隐伏活动断层探测中的应用潜力，选取河南省鹤壁市汤东断裂西支为研究对象，并在冯屯村和前交卸村分别开展联合探测，获取高信噪比的浅层人工地震反射剖面和地质雷达剖面。浅层人工地震勘探揭示的冯屯村处汤东断裂西支上断点埋深为60～70 m，地质雷达探测揭示的上断点埋深约为2.5 m，结合平均沉积速率推测汤东断裂西支在冯屯村的最新活动时代约为25 ka。浅层人工地震勘探揭示的前交卸村处汤东断裂西支上断点埋深为50～60 m，地质雷达探测揭示出汤东断裂西支在前交卸村处未造成近地表约10 m以内的地层断错。研究结果表明，在城市隐伏活动断层探测中，采用浅层人工地震勘探和地质雷达探测相结合的方法，不但可有效确定活动断层的位置，且可进一步约束活动断层上断点的准确埋深，有利于指导后期地震地质勘探中的探槽和钻孔布设。
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| 关 键 词： | 浅层人工地震勘探 地质雷达探测 城市隐伏活动断层 汤东断裂西支 上断点埋深 |
| 收稿时间： | 2022-01-27 |
Combined with Shallow Seismic Exploration and Ground Penetration Radar in Urban Active Fault Detection?An Example from the Tangdong Fault in Hebi,China |
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| Peng Bai,Su Peng,Lu Renqi,Cai Minggang,Hao Chongtao,Liu Guanshen.Combined with Shallow Seismic Exploration and Ground Penetration Radar in Urban Active Fault Detection?An Example from the Tangdong Fault in Hebi,China[J].Technology for Earthquake Disaster Prevention,2022,17(2):269-277. |
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| Authors: | Peng Bai Su Peng Lu Renqi Cai Minggang Hao Chongtao Liu Guanshen |
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| Affiliation: | 1.State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China2.Shanxi Taiyuan Continental Rift Dynamics National Observation and Research Station, Taiyuan 030025, China |
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| Abstract: | Shallow artificial seismic exploration is one of the most effective techniques to determine buried active faults in urban areas. However, due to its limitations of blind domains at near-surface and detection resolutions, this technique is hard to accurately determine the position (e.g., burial depth) of the upper breakpoint of a buried active fault in ultra-shallow layers. The Ground Penetration Radar (GPR) can make up for these limitations to some extent. To explore the technique combined with the shallow seismic exploration and the GPR, and analyze the application potential in buried active fault detection in urban areas, we carried out joint detection of the west branch of the Tangdong Fault in the Fengtun village and the Qianjiaoxie village, respectively, in Hebi, Henan Province. We obtained high-resolution shallow seismic reflection and GPR images in both sites. In the Fengtun village, the burial depth of the upper breakpoint of the targeted fault is constrained to 60～70 m by the shallow seismic exploration and about 2.5 m by the GPR. Combined with the regional average deposition rate, we infer that the last rupture event of the fault in the Fengtun village occurred at 25 ka. In the Qianjiaoxie village, the shallow seismic exploration reveals that the burial depth of the upper breakpoint of this fault is 50～60 m, and the GPR finds that the upper breakpoint is below ～10 m. This study indicates that the combination of the shallow seismic exploration and the GPR can not only determine fault locations but also constrain accurate positions of upper breakpoint of buried active faults in urban areas, which is very helpful for deciding trenching and drilling sites. |
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| Keywords: | Shallow artificial seismic exploration Ground Penetration Radar detection Buried active fault in urban areas The west branch of the Tangdong fault Buried depth of upper breakpoint |
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