气候变化领域集成服务门户(CCPortal): Present-day crustal deformation in the southeastern Tibetan Plateau: Insights from three-dimensional finite-element modeling

CCPortal

DOI	10.1016/j.tecto.2023.229983
	Present-day crustal deformation in the southeastern Tibetan Plateau: Insights from three-dimensional finite-element modeling
	Huang, Yong; Meng, Guojie; Cheng, Xu; Wu, Weiwei; Yang, Yexin
发表日期	2023
ISSN	0040-1951
EISSN	1879-3266
卷号	863
英文摘要	Quantifying the present-day kinematics of southeastern Tibet is important for understanding the tectonic evolution of the Tibetan Plateau. In this study, we established a three-dimensional finite element model to estimate fault slip and strain rates in the southeastern Tibetan Plateau based on Global Navigation Satellite Systems (GNSS) observations. Our model yields an overall good fit to the GNSS velocity field with residuals of 0.83 mm/ yr and 0.85 mm/yr for the east and north components, respectively, comparable to the uncertainties of 0.67 mm/ yr and 0.61 mm/yr. The model-derived strike-slip rates of the Xiaojiang fault, Nanhua-Chuxiong fault, Qujiang fault, central segment of Red River fault, southeastern segment of Red River fault and Dien Bien Phu fault are 13.7 & PLUSMN; 0.7 mm/yr, 1.9 & PLUSMN; 0.6 mm/yr, 3.4 & PLUSMN; 1.1 mm/yr, 1.5 & PLUSMN; 0.5 mm/yr, 1.2 & PLUSMN; 0.4 mm/yr and 1.6 & PLUSMN; 0.4 mm/ yr, respectively, which are consistent with previous geological results, implying that the short-term fault motions estimated from GNSS data can reflect the long-term fault slip in the southeastern Tibetan Plateau. The shear strain rate is localized along the Xiaojiang fault, which agrees with predictions of the tectonic extrusion model (i. e., the lateral extrusion of internally rigid blocks along strike-slip faults). Strain orientations in the western part of southeastern Tibetan Plateau are characterized by clockwise rotation. Comparison of the surface strain rates, crustal stress, and seismic anisotropy reveals general consistency between deformation of the surface and upper crust. The eastern part of southeastern Tibetan Plateau has small residuals, and the present-day crustal deformation can be explained by rigid block motion. However, the western part of the study area has relatively large residuals, implying that other processes, such as gravitational spreading, may influence deformation in the area. We propose a hybrid model that combines rigid block motion with continuum deformation to explain the contemporary crustal deformation of southeastern Tibetan Plateau.
关键词	Southeastern Tibetan Plateau GNSS observations Finite element modeling Fault slip rate Strain rate
英文关键词	RED-RIVER FAULT; SICHUAN-YUNNAN REGION; CENOZOIC TECTONICS; SLIP RATES; CONTINENTAL EXTRUSION; NORTHERN VIETNAM; STRESS EVOLUTION; STRAIN-RATE; CHINA; ZONE
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001058660100001
来源期刊	TECTONOPHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283752
作者单位	China Earthquake Administration; Institute of Earthquake Forecasting, CEA; China Earthquake Administration
推荐引用方式 GB/T 7714	Huang, Yong,Meng, Guojie,Cheng, Xu,et al. Present-day crustal deformation in the southeastern Tibetan Plateau: Insights from three-dimensional finite-element modeling[J],2023,863.
APA	Huang, Yong,Meng, Guojie,Cheng, Xu,Wu, Weiwei,&Yang, Yexin.(2023).Present-day crustal deformation in the southeastern Tibetan Plateau: Insights from three-dimensional finite-element modeling.TECTONOPHYSICS,863.
MLA	Huang, Yong,et al."Present-day crustal deformation in the southeastern Tibetan Plateau: Insights from three-dimensional finite-element modeling".TECTONOPHYSICS 863(2023).