JOURNAL OF THE BALKAN GEOPHYSICAL SOCIETY, Vol. 2, No 1, February 1999, p. 3-14, 8 figs.

A study of shallow crustal structure in the Mygdonia Basin (N. Greece)

based on the dispersion curves of Rayleigh waves

E.E. Karagianni *, D.G. Panagiotopoulos*, C.B. Papazachos**, and P.W. Burton***

* Geophysical Laboratory, University of Thessaloniki, Thessaloniki, Greece, GR- 54006.

** Institute of Engineering Seismology and Earthquake Engineering, Georg.Scholis 46, P.O. Box 53, GR-55102 Finikas, Thessaloniki, Greece.

*** University of East Anglia, School of Environmental Sciences, Norwich NR4 7TJ, U.K.

(Received 17 September 1998; accepted 20 October 1998 )

Abstract : A big shot experiment was carried out in the Mygdonia basin during the project "EUROSEISTEST VOLVI-THESSALONIKI, a European test site for Engineering Seismology, Earthquake and Seismology". This experiment was realised by using an explosion of 75 kg of explosives placed at 20 m depth. The aim of the explosion was to investigate the geometry and the VS profile across the valley, between the villages Profitis and Stivos which are laid between the lakes Koronia (Lagada) and Volvi in Northern Greece. The records of Rayleigh waves as they were generated by the big shot and recorded on the vertical components of the portable stations which were installed in Mygdonia basin, were analysed in order to obtain the group velocity dispersion curves corresponding to propagation paths between the shot point and the recording stations. Furthermore, these dispersion curves were inverted to determine the shear wave velocity models along the propagation paths by using linear approach.

Key Words: Shallow Crustal Structure, Dispersion Curves, Rayleigh Waves, Mygdonia Basin