Abstract:
The article discussed a method for joint processing of GPS and classical triangulation measurements to estimate the crustal movements in Central Western Bulgaria region. It was examined the possibility of combining GPS with angular measurements of the first class triangulation network in Bulgaria during the period 1923 – 1930 year. As a result of the processing of GPS and angular measurements are derived horizontal velocities of 15 points. The obtained results indicate the possibility of using the angular measurement of first class triangulation points, together with the GPS, to obtain estimates of the horizontal crustal movements.