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The Analysis Of The West Qinling's Current Crustal Movement And Deformation

Posted on:2011-05-22Degree:MasterType:Thesis
Country:ChinaCandidate:S L QinFull Text:PDF
GTID:2120360308460767Subject:Geodesy and Surveying Engineering
Abstract/Summary:PDF Full Text Request
The west Qinling orogenic belt located in the hinterland of china is the westward extension of the Qinling orogenic belt, and is an important part of the central orogenic belt of China. The West Qinling orogenic belt is the vast area surrounded by the Qaidam block, Qinghai NanShan fault-tumenguan faul, Baoji-Chengdu railway line and Maqin-Lueyang fault. It is special section of the convergence of the ancient Asian tectonic domain, Tethyan tectonic domain and the Pacific coast tectonic domain, and is also the conversion zone of the east and west, south and north of crustal structure, crustal thickness and geophysical field changes. Therefore, to research the current movement of the West Qinling is very important for us understanding the structure and motion law.In this paper, used the near 150 GPS observation dates of the network engineering in 2001 and 2007and processed through the GAMIT/GLOBK software we get the regional displacement field indicating that the current West Qinling block is move to east slowly. The level movement show the trend of NEE-EW-SE from west to east and the overall clockwise rotation.Processed the level data of the west Qinling's monitoring network since the 70's, we can get the vertical rate diagram compared to the Baoji and Lanzhou respectively. Compared the Lanzhou, the West Qinling show upward trend, the uplift rate is about 2~4mm/a, the largest uplift is in the surrounding region of Liupanshan up to 4mm/a. Compared Baoji, Hanzhong is rise, the uplift rate is about 1.5~2.5mm/a. Hanzhong-wangziguan-Minxian segment increased marginally, about 0.5mm/a. Minxian-Hezuo segment show uplift trend, Hezuo-Lanzhou show subsidence trend, the rate is -1.2mm/a. Near the Lanzhou is sinking. This is the same trend of the geologic structure by and large.
Keywords/Search Tags:West Qinling orogenic belt, tectonic movement, horizontal deformation, vertical deformation
PDF Full Text Request
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