• 责任者：Cao Jianling (Key Laboratory of Earthquake Prediction ; CEA ; Beijing 100036 ; China) ; Wang Hui
• 刊名：Earthquake
• 出版年：2013
• 卷期：33(4)
• 关键词：下地壳 ; lower crust ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.55-63
• 图表：6 illus., 1 table, 30 refs.
• 分类号：0400
• issnNo：ISSN1000-3274
• isbnNo：CN11-1893/P

     The idea of ductile flow beneath the Tibetan Plateau is widely accepted.However,there is a dispute on the way and speed of the lower crustal flow.Surface motion has direct measurements such as GPS,and mantle movement has indirect methods such as Swave splitting.As to the lower crustal movement,there is no direct observation,so that numerical analysis is very important.In this paper,we constructed a 3-D spherical viscoelastic finite element model of the Tibetan Plateau to simulate the crustal flow pattern.By fitting GPS data and comparing different models,we considered that the eastward flow of the ductile lower crust in the Tibetan Plateau has been resisted by the Sichuan Basin,a channel exists in the south-eastern corner of the plateau,and similar channels of substances do not exist on the northeast corner of the plateau.The lower crust moves several milimeter faster than the upper crust,the corresponding viscosity of the lower crust was between 1018～1019 Pa• s.