the strain rate tensor

Estimated from GPS observations velocities of GPS-stations were used to obtain 2D-model velocities and strain rate field in the Eastern Europe. The study of the velocities field in the region was done in a few steps. The first one consists of the development of the finite element approach on the geosphere based on bicubic spline functions and least squares collocation method for the interpolation scattered GPS-data to the regular nodes. The second one represents the inversion of velocities from GPS-observations to the strain rate tensor.

   Estimated from GPS observations velocities of GPS stations were used to obtain 2D model velocities and strain rate field in the Greece, the Turkey and Iran area. As a result, the study of the velocities field was done in the following steps. The first one consists of the development of the finite element approach on the geosphere based on bicubic spline functions for the interpolation scattered GPS data to the regular nodes because observations have irregular distribution. The second one represents the inversion of velocities from GPS observations to the strain rate tensor.