Abstract
The absolute displacement velocity (displacement compares with the center of the Earth Centered Earth Fixed Coordinate System) at points in the geodetic network measured by GNSS shows the dis- placement of the Earth’s crust. Due to the characteristics of geological tectonic activities, they have many unusual and non-linear components. This articale introduces the theoretical basis of the Wavelet Transform method for estimating the spatial velocity field characteristic for Northern Vietnam from GNSS data in period from 2012 to 2015. Horizontal velocity field has value and direc-tion compatible with ones of Eurasian Plate. Based on vertical velocity field there is any comment on upward and downward motion in studied area. The estimated downward velocities are too large (up to -2cm/yr) in North-east and in North and downward (in mountainous region) and upward movements (in South-eastern hollow) here are not really adequate.
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