Analysis on 3D crustal deformation of Qinghai-Tibet Plateau and its surrounding areas based on block model

doi:10.11947/j.AGCS.2022.20220123

Abstract

Abstract: 2020 height measurement of Mount Qomolangma has obtained rich GNSS monitoring data of Qinghai-Tibet Plateau and its surrounding areas. This paper collected the long-term observation data of GNSS from CMONOC and Nepal CORS network, got the 3D velocity field of GNSS for more than 20 years, and used GRACE model to eliminate the influence of non-tectonic load deformation and improve the accuracy of vertical velocity field. Then, it studied the characteristics of crustal movement and tectonic deformation of the Qinghai-Tibet Plateau from many aspects such as crustal movement, block movement and strain, block relative movement through the block model. The results show that the crustal deformation of the Qinghai-Tibet Plateau has obvious zoning characteristics. The north-south contraction is mainly manifested in the Lasa block, the east-west extension is mainly manifested in the Bayankala block, and the Qiangtang block has no obvious horizontal compression, but the crustal uplift rate is the largest, and the horizontal area tends to expand. The results of this paper can support the crustal thickening theory of the Qinghai-Tibet Plateau.

Key words: Qinghai-Tibet Plateau, GNSS, block model, tectonic deformation, vertical deformation

CLC Number:

P227

DANG Yamin, YANG Qiang, WANG Wei, LIANG Yuke. Analysis on 3D crustal deformation of Qinghai-Tibet Plateau and its surrounding areas based on block model[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(7): 1192-1205.

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