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ANALYSIS OF VERTICAL CRUST DEFORMATION BY USING IMPROVED LEAST-SQUARE COLLOCATION

A suitable interpolation of geodetic measurements is relied on in calculation and analysis of recent crustal movements. Least squares collocation (LSC) is applied to formulate a continuous velocity fields as a common interpolation method. But LSC requires some priori assumptions about the velocity fields.Therefore we present a improved method that can be used for interpolation of inhomogeneous velocity,in which the traditional least squares collocation and the gradient function are combined to extract the trend term of deformation. The method has been tested in two examples. One example is a synthetic data that simulate the geodetic measurements over the area where exists a fault, the other is the vertical deformation rate around Beijing. From the results, stable interpolation can be made in inhomogeneous velocity field, in the same time, the buried fault can well be found.