| 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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| 关键词:Beijing plain Huangzhuang—Gaoliying fault buried active fault active faults exploration borehole joint section |
| 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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| Evidence of Shallow Synthetic Exploration of Quaternary Activity Characteristics along Fangshan–Laishui Section of Huangzhuang–Gaoliying Fault in Beijing Plain |
| 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. |
| ZHOU Yong-heng,YANG Xiao-xiao,FENG Cheng-jun,ZHANG Peng,MENG Jing,TAN Cheng-xuan,DENG Ya-hong,SONG Yan-xun,WANG Ji-ming.2021.Evidence of Shallow Synthetic Exploration of Quaternary Activity Characteristics along Fangshan–Laishui Section of Huangzhuang–Gaoliying Fault in Beijing Plain[J].Acta Geoscientica Sinica,42(5):677-689. |
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