期刊
TECTONOPHYSICS
卷 722, 期 -, 页码 11-24出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2017.10.024
关键词
Geomorphic indices; Normal faulting; Segmentation; Weihe Graben; Ordos block
资金
- National Natural Science Foundation of China [41502203]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China
- Natural Science Foundation of Zhejiang Province [LY15D020001]
- Open Fund of Key Laboratory of Submarine Geosciences, SOA [KLSG1601]
- National Science and Technology Major Project [2017ZX05008-001]
- China Geological Survey [12120110400015001, 1212011120099]
The Cenozoic graben systems around the tectonically stable Ordos Block, central China, have been considered as ideal places for investigating active deformation within continental rifts, such as the Weihe Graben at the southern margin with high historical seismicity (e.g., 1556 M similar to 8.5 Huaxian great earthquake). However, previous investigations have mostly focused on the active structures in the eastern and northern parts of this graben. By contrast, in the southwest, tectonic activity along the northern margin of the Qinling Mountains has not been systematically investigated yet. In this study, based on digital elevation models (DEMs), we carried out geo-morphological analysis to evaluate the relative tectonic activity along the whole South Border Fault (SBF). On the basis of field observations, high resolution DEMs acquired by small unmanned aerial vehicles (sUVA) using structure-for-motion techniques, radiocarbon (C-14) age dating, we demonstrate that: 1) Tectonic activity along the SBF changes along strike, being higher in the eastern sector. 2) Seven major segment boundaries have been assigned, where the fault changes its strike and has lower tectonic activity. 3) The fault segment between the cities of Huaxian and Huayin characterized by almost pure normal slip has been active during the Holocene. We suggest that these findings would provide a basis for further investigating on the seismic risk in densely-populated Weihe Graben.
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