The Spherical Wavelet Model and Multiscale Analysis of Characteristics of GPS Velocity Fields in Mainland China
Cheng Pengfe · Acta Geodaetica et Cartographica Sinica · 2015
The GPS measurements of the Crustal Movement Observation Network in China(CMONC)from1999to 2009 were processed,and the velocities of 1068 stations in east and north directions were derived.These velocities were used to establish velocity models in east and north directions within mainland China by using Difference of Gauss(DOG)spherical wavelet.The trend of GPS velocity fields are derived by regional Euler vector method,the residual velocity fields are then used for the spherical wavelet modeling.The scales of wavelets are selected according to distributions of GPS stations.The accuracy of the model is estimated according to the mean square deviation between observations and model,which is ±0.95mm/a for east direction,and±0.97mm/a for north direction in the region with dense stations,while it is±1.32mm/a and±1.30mm/a respectively for east and north directions in the region with sparse stations.The spherical wavelet modeling of the velocity can also show characteristics at different scales.