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	How fast is the middle-lower crust flowing in eastern tibet? a constraint from geodetic observations
	Yi, Shuang1; Freymueller, Jeffrey T.2; Sun, Wenke1
刊名	Journal of geophysical research-solid earth
	2016-09-01
卷号	121期号:9页码:6903-6915
关键词	Eastern tibet Deep crust flow Convective removal Grace Gps Moho interface
ISSN号	2169-9313
DOI	10.1002/2016jb013151
通讯作者	Sun, wenke(sunw@ucas.ac.cn)
英文摘要	Various geophysical observations, including seismological and magnetotelluric imaging, have implied that the deep crust beneath eastern tibet may be partially melted and flowing faster than the brittle upper crust. however, it is still unclear how much faster the deep crust is flowing. geodetic observations, which are more sensitive to dynamic changes, provide constraints on the flow rate of the middle and lower crust (mlc). three-dimensional gps velocities show that deformation within the brittle upper crust contributes little (0.020.02mm/yr) to the overall surface uplift (2.70.3mm/yr). therefore, two plausible models for the surface uplift are discussed, which are consistent with the geodetic constraints. in the deep crustal flow model, crustal thickening requires the horizontal flow rate of the mlc to be 330%-710% of the rate of motion of the upper crust, and the deepening of the moho is only up to 35% of that required to maintain isostatic balance; isostasy may not be maintained over the geodetic timescale. in the hybrid model of deep crustal flow and convective lithospheric detachment, the moho is uprising, and only weak or moderate (130%-250%) deep crustal flow is required, which results in moderate present-day crustal thickening beneath eastern tibet. this result improves our understanding of the plateau construction and dynamics and also offers advice for numerical simulations.
WOS关键词	2008 WENCHUAN EARTHQUAKE ; CHINESE CONTINENT ; PLATEAU ; DEFORMATION ; SYSTEM ; UPLIFT ; GRAVITY ; FAULTS ; MARGIN ; MODEL
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000385845700035
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2374817
专题	中国科学院大学
通讯作者	Sun, Wenke
作者单位	1.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing, Peoples R China 2.Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA
推荐引用方式 GB/T 7714	Yi, Shuang,Freymueller, Jeffrey T.,Sun, Wenke. How fast is the middle-lower crust flowing in eastern tibet? a constraint from geodetic observations[J]. Journal of geophysical research-solid earth,2016,121(9):6903-6915.
APA	Yi, Shuang,Freymueller, Jeffrey T.,&Sun, Wenke.(2016).How fast is the middle-lower crust flowing in eastern tibet? a constraint from geodetic observations.Journal of geophysical research-solid earth,121(9),6903-6915.
MLA	Yi, Shuang,et al."How fast is the middle-lower crust flowing in eastern tibet? a constraint from geodetic observations".Journal of geophysical research-solid earth 121.9(2016):6903-6915.

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