Employment of a Permanent Monitoring GPS Network at the Seismic Area of Volvi, Greece

P. D. Savvaidis and I. M. Ifadis

Abstract:	In 1978, severe earthquakes damaged an extensive area of Northern Greece including the city of Thessaloniki. The main shocks came from the seismic zone of Volvi, NE of Thessaloniki. A control network for the determination of ground displacements was established in the area the same year and was repeatedly measured with classical geodetic methods until 1990. In 1994, a GPS network was also established and measured. The GPS network was extended and re-measured in 1997. In 1999, a Continuous Geodetic Reference Station started to operate at the facilities of the Laboratory of Geodesy, Department of Civil Engineering, Aristotle University of Thessaloniki. In order to continuously observe the dynamic behaviour of the area connected to seismic phenomena, a selection of sites for the installation of permanent monitoring GPS receivers was made, along with the initialisation of a wide-area computer network for data transfer. In this way, computation and adjustment of GPS measured vectors can be performed every day, or in even smaller time periods. The whole procedure results into a quick determination of possible movements of the control GPS stations, thus frequently updating our knowledge of the ground deformations in the area.
Published in:	Proceedings of the IAIN World Congress and the 56th Annual Meeting of The Institute of Navigation (2000) June 26 - 28, 2000 The Catamaran Resort Hotel San Diego, CA
Pages:	639 - 643
Cite this article:	Savvaidis, P. D., Ifadis, I. M., "Employment of a Permanent Monitoring GPS Network at the Seismic Area of Volvi, Greece," Proceedings of the IAIN World Congress and the 56th Annual Meeting of The Institute of Navigation (2000), San Diego, CA, June 2000, pp. 639-643.
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