| 北京平原区黄庄—高丽营断裂(房山—涞水段)第四纪活动特征的浅层综合探测证据 |
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| 引用本文：周永恒,杨肖肖,丰成君,张鹏,孟静,谭成轩,邓亚虹,宋焱勋,王继明.2021.北京平原区黄庄—高丽营断裂(房山—涞水段)第四纪活动特征的浅层综合探测证据[J].地球学报,42(5):677-689. |
| DOI：10.3975/cagsb.2020.012502 |
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| 基金项目:国家自然科学基金面上项目(编号: 41772275);中国地质调查局地质调查项目(编号: DD20190317) |
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| 中文摘要:黄庄—高丽营断裂是北京平原区主要的隐伏活动断裂之一, 其第四纪活动性对北京及邻区的城市规划、建设具有重要的意义。针对该隐伏断裂的复杂特征, 本文通过可控源音频大地电磁测深(CSAMT)、浅层人工地震、高密度电阻率法等地球物理探测技术, 结合联合钻孔剖面方法, 揭示了黄庄—高丽营断裂房山—涞水段的第四纪活动性及主要特征, 探测结果与综合分析表明: (1)该断裂走向NE, 倾向SE, 倾角为60°~70°, 具典型的正断活动特征。(2)推断黄庄—高丽营断裂(房山—涞水段)上断点埋深约10 m, 上更新统欧庄组底界错距约16 m, 可能为晚更新世早期活动断裂, 并可能是1658年涞水6级地震的发震构造, 并对浅地表地裂缝地质灾害具有一定的控制作用。因此, 对黄庄—高丽营断裂房山—涞水段的几何学与运动学的综合探测结果可为该地区重大工程建设的区域地壳稳定性评价及防灾减灾等提供关键地质依据。(3)综合物探结果可知, CSAMT法对隐伏活动断裂的初期探测有重要意义, 在第四系松散沉积层内浅层地震勘探剖面揭示的断裂特征不如其在坚硬岩石地层内揭示的断裂特征明显, 但通过多种物探方法的综合探测, 能够做到优势互补, 增加隐伏活动断裂探测的确定性。 |
| 中文关键词:北京平原 黄庄—高丽营断裂 隐伏活动断裂 活断层探测 钻孔联合剖面 |
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| Evidence of Shallow Synthetic Exploration of Quaternary Activity Characteristics along Fangshan–Laishui Section of Huangzhuang–Gaoliying Fault in Beijing Plain |
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| Abstract:Huangzhuang–Gaoliying fault is one of important buried active faults in Beijing plain area. It is of great significance to study the activity of the fault for urban planning and construction in Beijing and its surrounding areas. As the condition of the buried active fault is complex, the authors used many methods, such as the controlled source audio-frequency magnetotelluric survey (CSAMT), shallow seismic reflection, high density resistivity and drilling exploration. The Quaternary activity and main characteristics of Fangshan Laishui section of Huangzhuang Gaoliying fault were revealed. The detection results and comprehensive analysis show the following features: (1) The fault zone is a typical NE-striking and SE-dipping normal fault with the apparent dip angle being 60° to 70°. (2) The buried depth of upper breakpoint of the fault may be only 10 m, and the bottom interface of the late Pleistocene Ouzhuang Formation is dislocated by about 16 m by the fault. It is inferred that the fault is an active fault of the late Pleistocene period. The fault may be the seismogenic structure of the 1658 Laishui MS 6 earthquake, and may play a certain role in controlling the development of geological hazards of ground fissures on the shallow surface. Therefore, the comprehensive exploration results of geometry and kinematics of Fangshan–Laishui section along Huangzhuang–Gaoliying fault can provide the key geological basis for regional crustal stability evaluation and disaster prevention and mitigation of major engineering construction in this area. (3) The synthetic geophysical exploration results show that CSAMT method is of great significance for the early detection of buried active faults. The fault characteristics revealed by shallow seismic exploration profile in Quaternary loose sedimentary layer is not as obvious as those revealed in hard rock strata. However, through the synthetic detection of multiple geophysical exploration methods, the advantages can be complemented and the certainty of detection of buried active faults can be increased. |
| keywords:Beijing plain Huangzhuang—Gaoliying fault buried active fault active faults exploration borehole joint section |
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