气候变化领域集成服务门户(CCPortal): Post-Earthquake Fold Growth Imaged in the Qaidam Basin, China, With Interferometric Synthetic Aperture Radar

CCPortal

DOI	10.1029/2020JB021241
	Post-Earthquake Fold Growth Imaged in the Qaidam Basin, China, With Interferometric Synthetic Aperture Radar
	Daout S.; Parsons B.; Walker R.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Questions regarding the development of folds and their interactions with the seismic faults within thrust systems remain unanswered. However, estimating fault slip and earthquake hazards using surface observations and kinematic models of folding requires an understanding of how the shortening is accommodated during the different phases of the earthquake cycle. Here, we construct 16-years of interferometric synthetic aperture radar time series across the North Qaidam thrust system (NE Tibet), where three Mw 6.3 earthquakes occurred along basement faults underlying shortened folded sediments. The analysis reveals spatio-temporal changes of post-earthquake surface displacement rates and patterns, which continue more than 10 years after the seismic events. The decomposition of the Sentinel-1 ascending and descending line of sight velocities into vertical and shortening post-earthquake components indicates that long-term transient uplift and shortening is in agreement with the deformation that might be expected from kinematic models of folding. Long-term uplift coincides spatially with young anticlines observed in the geomorphology, with steep gradients in the forelimbs, gentle gradients in the back-limbs, an absence of subsidence in the footwalls, and higher gradients along interpreted bedding planes. Long-term shortening is also different from the surface displacements expected for typical time-varying creep on a narrow dislocation interface and shows rates higher than the average convergence across the whole region. These findings provide evidence for anelastic fold buckling during the post-earthquake phase and highlight the contribution of distributed aseismic deformation to the growth of topography. © 2021. The Authors.
英文关键词	aseismic slip; buckling; fold growth; InSAR time series; post-seismic; Qaidam basin
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187324
作者单位	Department of Earth Sciences, COMET, University of Oxford, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Daout S.,Parsons B.,Walker R.. Post-Earthquake Fold Growth Imaged in the Qaidam Basin, China, With Interferometric Synthetic Aperture Radar[J],2021,126(3).
APA	Daout S.,Parsons B.,&Walker R..(2021).Post-Earthquake Fold Growth Imaged in the Qaidam Basin, China, With Interferometric Synthetic Aperture Radar.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Daout S.,et al."Post-Earthquake Fold Growth Imaged in the Qaidam Basin, China, With Interferometric Synthetic Aperture Radar".Journal of Geophysical Research: Solid Earth 126.3(2021).