Late Quaternary Slip along Yangguan Fault at Northeastern Section of Altyn Tagh Fault and Implications for Seismic Risk

被引：0
|
作者：
Shao Y. [1 ,2 ]
Zou X. [1 ]
Yuan D. [3 ]
Yao Y. [1 ,2 ]
Liu X. [1 ,2 ]
机构：
[1] Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou
[2] Lanzhou National Geophysical Observatory, Lanzhou
[3] School of Earth Sciences, Lanzhou University, Lanzhou
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 02期
关键词：
Altyn Tagh Fault; Dunhuang; Paleoseismology; Seismic prevention and disaster mitigation; Seismology; Yangguan Fault;
D O I：
10.3799/dqkx.2020.082
中图分类号：
学科分类号：
摘要：
The Yangguan Fault is located on northwestern section of the Altyn Tagh Fault, which is a large strike slip fault and seismotectonic in Northeast Tibet Plateau, which poses potential seismic hazard to city development and culture relics in Dunhuang area. In this study it focuses on characterizing activity of the Yangguan Fault, using high resolution satellite imagery to map faults in space. At two study sites, it made detailed investigation by methods of difference GPS, aerial photogrammetry with unmanned aerial vehicle, paleoseismical trench and Optically Stimulated Luminescence dating. The preliminary results are that the Yangguan Fault is a thrust fault trending NEE with high dipping angle; its latest event likely occurred between 43.5 ka and 12.1 ka. The results imply that the eastern section of the Yangguan Fault ruptured at least during Late Pleistocene. It is proposed that the eastern section rupture will cause an earthquake of Mw 6.6, shaking the nearby area strongly, and the seismic intensity in the Dunhuang downtown will be more than Ⅵ, reaching up to Ⅸ at Yangguan relic site. Therefore, the Yangguan Fault is an important seismic fault in West Hexi Corridor. This study provides critical data for seismic prevention and disaster mitigation for city development and culture relic protection in Dunhuang area. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：683 / 696
页数：13
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