The evolution of a well-known seismic area in northern Greece after a large earthquake

AbstractIn 1996 new measurements of a trigonometric network installed in 1979 in the seismically active area of the lake Volvi, in northern Greece near Thessaloniki, were performed with the use of GPS technology. An analysis of the data set of the 1996 measurements gave us the displacement field of the 11 stations of this network. The most dominant feature of this field is an expanding trend in north-south direction. This trend there is in this field since 1979 when the first measurements of this network were done. This means that since 1979 the rocks of this area are subjected to a force tensile in the north-south direction. This is in agreement with the foults geometry of this area, since the known faults there have a general direction from east to west.