DOI: 10.1016/j.epsl.2021.117001
论文题名: Geodetic imaging of shallow creep along the Xianshuihe fault and its frictional properties
作者: Qiao X. ; Zhou Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 567 语种: 英语
中文关键词: creep
; rate-and-state frictional properties
; Sentinel-1
; Xianshuihe fault
英文关键词: Creep
; Earthquakes
; Locks (fasteners)
; Active fault
; Behaviour properties
; Deformation field
; Eastern Tibetan plateau
; Frictional properties
; Rate-and-state frictional property
; Sentinel-1
; Slip behavior
; Slip rates
; Xianshuihe fault
; Friction
; active fault
; creep
; deformation
; fault slip
; fault zone
; friction
; geodesy
; Sentinel
; China
; Qinghai-Xizang Plateau
英文摘要: 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 Mw 5.6 and 5.9 earthquakes. The seismic moment accumulated on the Qianning segment since the last major event is equivalent to a Mw 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). © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165638
Appears in Collections: 气候变化与战略
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作者单位: Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China
Recommended Citation:
Qiao X.,Zhou Y.. Geodetic imaging of shallow creep along the Xianshuihe fault and its frictional properties[J]. Earth and Planetary Science Letters,2021-01-01,567