Holocene Slip Rate and Earthquake Hazard of the North-Edge Fault of the Yanqi Basin, Southeastern Tian Shan, China

被引：0
|
作者：
Huang W.-L. [1 ,2 ]
Yang X.-P. [2 ]
Li S.-Q. [3 ]
Yang H.-B. [2 ]
机构：
[1] College of Geological Engineering and Surveying of Chang'an University, Key Laboratory of Western China Mineral Resources and Geological Engineering, Xi'an
[2] Key Laboratory of Active Tectonics and Volcano, The Institute of Geology, China Earthquake Administration, Beijing
[3] Hebei Earthquake Agency, China Earthquake Administration, Shijiazhuang
来源：
Dizhen Dizhi | 2018年 / 40卷 / 01期
关键词：
Active fault; Cosmogenic nuclide dating; Holocene; Tian Shan; Yanqi Bain;
D O I：
10.3969/j.issn.0253-4967.2018.01.014
中图分类号：
学科分类号：
摘要：
The Tian Shan Mountains is an active orogen in the continent. Previous studies on its tectonic deformation focus on the expanding fronts to basins on either side, while little work has been done on its interiors. This work studied the north-edge fault of the Yanqi Basin on the southeastern flank of Tian Shan. Typical offset landforms, and lineaments of scarps on the eastern segment of this fault were used to constrain the vertical displacement and shortening rates. Geological and geomorphic mapping in conjunction with high-resolution GPS differential measurement reveals that the vertical offsets can be divided into three groups of 1.9m, 2.4m and 3.0m, and the coseismic vertical offset was estimated as 0.5~0.6m. In situ10Be terrestrial cosmogenic nuclide dating of three big boulders capping the regional geomorphic surface that preserved 3.0m vertical offset suggests that the surfaces were exposed at ~5ka. Meanwhile, the lacustrine sediments from Bosten Lake within the Yanqi Basin suggest climate change during cooling-warming transitions was also at ~5ka. The climate, therefore, controlled creation and abandonment of geomorphic surfaces in southern piedmont of Tian Shan. Combining the exposure ages and vertical offsets, we inferred that the east section of the north-edge fault in the Yanqi Basin has a dip slip rate 0.6~0.7mm/a, ~0.5mm/a of vertical slip and ~0.4mm/a of shortening since 5ka. Based on calculation of earthquake moment, we estimated that this fault is capable of generating M7.5 earthquakes in the future. This study provides new data for further understanding tectonic deformation of Tian Shan and is useful in seismic hazard assessment of this area. © 2018, Editorial Office of Seismology and Geology. All right reserved.
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页码：186 / 203
页数：17
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