Vertical deformation caused by glacial isostatic adjustment in Canada based on GAMIT/GLOBK and GPS measurements

doi:10.13474/j.cnki.11-2246.2021.0138

Abstract

Abstract: Based on the GAMIT/GLOBK software, this paper processes the original GPS observation data, with a time span of 2000—2018, from 31 IGS stations in Canada, and obtains the time series of the station vertical velocities under the ITRF2014 reference frame. With jumps corrected and outliers eliminated, this paper removes contributions from elastic deformations caused by the recent melting of glaciers, and estimates the uplift rate of GPS stations caused by glacial isostatic adjustment (GIA) from the GPS time series. The differences between the results and the previous results are within 2 mm/a, and the difference between the results and the predicted value of the ICE6G series GIA model is within 3 mm/a, which verify the correctness and reliability of the results. This study has laid a solid foundation for constraining and improving the GIA model by using observation data from global GPS stations.

Key words: glacial isostatic adjustment, crustal vertical movement, GAMIT/GLOBK, GPS time series

CLC Number:

P228

ZHANG Hanwei, CHEN Wei, LI Jiancheng. Vertical deformation caused by glacial isostatic adjustment in Canada based on GAMIT/GLOBK and GPS measurements[J]. Bulletin of Surveying and Mapping, 2021, 0(5): 38-42.

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