期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 567, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.epsl.2021.117001
关键词
Sentinel-1; Xianshuihe fault; creep; rate-and-state frictional properties
资金
- Second Tibetan Scientific Expedition and Research Program (STEP) [2019QZKK0901]
- National Natural Science Foundation of China [41874020]
- National Key Research and Development Program of China [2019YFC1509205]
- Guangdong Province Introduced Innovative R&D Team of Geological Processes and National Disasters around the South China Sea [2016ZT06N331]
- Deep Earth Exploration and Resource Environment [2017ZT07Z006]
The Xianshuihe fault is tectonically active with widespread shallow creep. The tectonic loading rate and locking depth along the fault are estimated using fault-parallel velocities. Variability in shallow aseismic slip rates is observed along different segments of the fault.
The Xianshuihe fault is one of the most tectonically active faults in the eastern Tibetan plateau. Understanding its slip behaviour and frictional properties is essential for determining the seismic potential. We use Sentinel-1A/B data from ascending and descending tracks to estimate the deformation field and retrieve three-dimensional velocities during the period of 2014-2019. We find that shallow creep is widely distributed along the entire Xianshuihe fault. Elastic dislocation modelling based on fault-parallel velocities reveals that the tectonic loading rate along the Xianshuihe fault is in the range of 8.8-17.9 mm/yr with a locking depth of 7.6-18.5 km. The shallow aseismic slip rate ranges from 3.3-7.8 mm/yr on the Daofu and Qianning segments, to 16.3-19.8 mm/yr on the western Kangding segment; the high aseismic slip rate on the western Kangding segment is likely due to postseismic relaxation of the 2014 Kangding M-w 5.6 and 5.9 earthquakes. The seismic moment accumulated on the Qianning segment since the last major event is equivalent to a M-w 6.6 earthquake. Analysis of the evolution of aseismic slip in the framework of rate-and-state friction shows that the Kangding segment has a much smaller (a-b) (0.0030) than the Daofu segment, (a-b) = 0.0162. The difference is potentially controlled by different rock types between the Kangding segment (granite) and other segments of the Xianshuihe fault (quartz-rich sandstone). (C) 2021 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据