The Atalanti Fault System located in the central part of Greece, and is one of the main tectonic active systems of central Greece. The last reactivation of the system resulted in the major earthquakes of 1894 (M=6.7 and M=7) causing very serious damages to the region.
In September of 2001 a GPS network of eighteen (18) stations was established in the area to detect probable preseismic deformation.

The GPS network has been remeasured during October 2002.

Figure 1: The Atalanti Faulting Zone GPS network

The network was referred to Dionysos (Athens) permanent GPS station, run by Prof. D. Paradeisis - NTUA Higher Geodesy Laboratory, to measure the regional deformation of the Atalanti Faulting Zone. Dionysos GPS station moves to about SSE with a velocity of about 13 mm/year, and . upwards about 0.5 mm/year. The GPS station No 54 located to the city of Atalanti was used as a reference station with fixed co-ordinates to study the local ground deformation.

Figure 2: Horizontal component of ground deformation with respect to Dionysos (Athens) GPS station, for the period Oct. 2001 to Oct. 2002. Figure 2 (600x308 jpg, 27 Kb)	Figure 3: Vertical component of ground deformation with respect to Dionysos (Athens) GPS station, for the period Oct. 2001 to Oct. 2002. Figure 3 (600x311 jpg, 27 Kb)
Figure 4: Horizontal ground deformation with respect to GPS station in the city of Atalanti (No 54) Figure 4 (600x308 jpg, 27 Kb)	Figure 5: Vertical ground deformation with respect to GPS station in the city of Atalanti (No 54) Figure 5 (600x308 jpg, 28 Kb)