Acta Geodaetica et Geophysica Hungarica 34. (1999)

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ACTA GEODAETICA ET GEOPHYSICA HUNGARICA A Quarterly Journal of the Hungarian Academy of Sciences Acta Geodaetica et Geophysica Hungarica (AGG) publishes original reports and reviews on geodesy and geophysics in English. AGG is published in yearly volumes of four issues by AKADÉMIAI KIADÓ H-1117 Budapest, Prielle K. u. 4 Manuscripts and editorial correspondence should be addressed to AGG Editorial Office Geodetical and Geophysical Research Institute H-9401 Sopron, P. O. Box 5 Phone: (36-99) 314-290 Fax: (36-99) 313-267 E-mail: Internet: Subscription information Orders should be addressed to AKADÉMIAI KIADÓ H-1519 Budapest, P. O. Box 245 © Akadémiai Kiadó, Budapest 1999 ADVISORY BOARD M BURSA, Praha (astronomical geodesy), C DENIS, Liège (geodynamics), A EBEL, Köln (upper atmosphere), S-E HJELT, Oulu (electromagnetic induction), H LÜHR, Braunschweig (space physics), D NAGY, Ottawa (geodesy), G F PANZA, Trieste (seismology), H SÜNKEL, Graz (geodesy), U VILLANTE, L'Aquila (geomagnetism), L P VINNIK, Moscow (seismology), J ZSCHAU, Potsdam (solid Earth physics) Printed in Hungary PXP, Budapest