Quaternary Activity Study of Major Buried Faults near Xiongan New Area
SHANG Shi-jie;FENG Cheng-jun;TAN Cheng-xuan;QI Bang-shen;ZHANG Peng;MENG Jing;WANG Miao-miao;SUN Ming-qian;WAN Jia-wei;WANG Hui-qing;XIANG Xin-xuan;School of Earth Sciences and Resources, China University of Geosciences (Beijing);Institute of Geomechanics, Chinese Academy of Geological Sciences;Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Natural Resources;Beijing Institute of Geo-exploration Technology;College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing);
The construction of Xiongan New Area is an important measure to adjust and optimize the urban layout and spatial structure of Beijing, Tianjin and Hebei. The study of the activity of main buried faults in Xiongan New Area and its adjacent areas is of great significance for the planning and construction of the new area. Through the comprehensive geophysical exploration of controlled source audio-frequency magnetotelluric sounding, shallow seismic and high-density resistivity, combined with borehole stratigraphic profile records, the geometric distribution characteristics and Quaternary activity characteristics of Baoding–Shijiazhuang and Xushui–Dacheng faults in the periphery of Xiongan New Area are basically clarified. Some conclusions have been reached: 1) Baoding–Shijiazhuang fault is a normal fault with strikes NE–SW and dips SE with dip angle being 45°～75°; 2) Xushui–Dacheng fault is a normal fault which strikes WNW–ESE and dips S with dip angle being 70°; 3) Baoding–Shijiazhuang fault has not been active since Quaternary, Xushui–Dacheng fault has not been active since Late Pleistocene, and Xiongan New Area is in a tectonic stable area as a whole.