GPS AND TERRESTRIAL MEASUREMENTS FOR DETECTING CRUSTAL MOVEMENTS IN A SEISMIC AREA

In 1995 new measurements of a trigonometric network installed in 1979 in the seismically active area of Lake Volvi in northern Greece near Thessaloniki were performed with the use of GPS technology. This network was measured in five successive triangulation surveys between 1979 and 1983 and in two m...

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Bibliographic Details
Published in:Empire Survey Review 1998-07, Vol.34 (269), p.447-454
Main Authors: Asteriadis, G, Schwan, H
Format: Article
Language:English
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Summary:In 1995 new measurements of a trigonometric network installed in 1979 in the seismically active area of Lake Volvi in northern Greece near Thessaloniki were performed with the use of GPS technology. This network was measured in five successive triangulation surveys between 1979 and 1983 and in two more surveys in 1989 and 1990. All the observational data from 1979 to 1990 was transformed to the same reference system as that of the last survey, the WGS84, the reference system of GPS. Analysing this data, we have drawn conclusions about the velocity field defined by the displacement vectors of the network stations. The most noticeable feature of this velocity field is an expanding trend in the north-south direction, amounting to about 3 mm/year, from the centre to the outer limit of the area.
ISSN:0039-6265
0267-1034
1752-2706
DOI:10.1179/sre.1998.34.269.447