Analysing the areal distribution of earthquakes produced in the Carpathian Basin the conclusion can be drawn that only certain parts can be considered active along fracture lines, namely those parts which separate individually moving blocks. Generally accepted working theory states that if one fracture line ever generated an M-magnitude earthquake then at any point of the same line a similar or larger tremor may happen again. However, this principle is not supported by domestic experiences. In accordance with focal depths analysis we are going to verify that earthquakes were produced within more or less consolidated layers inside subsiding basins. Our analysis is aimed to explain the possible origin of earthquakes within small depth range and to point out the practical benefit of these investigations. We present also an analysis on the possible origin of „basin tremors” not taken so far into consideration and we offer a plausible explanation. Uncertainties of focal depth (hypocenter) determinations will also be given and we define relations between the focal depth (h), the magnitude (M), and the epicentral intensity (Io). The result will be presented in tables and comparison will be given between the focal depth data determined by us and by others. Finally viewpoints will be presented to help the recognition of earthquake foci and to set earthquake hazard determination on a real basis.
Bisztricsány E, Csomor D 1958: Acta Geologica, 5, 235--244.
Bune V I, Gracsev A F, Lapusonok I L et al. 1987: Brief explanatory paper for the map demonstrated the Mmax values of the Peoples Republic of Hungary and for the parameters of earthquake focuses of seismically active zones of Pannonian Basin (in Hungarian). Manuscript, Report of Geophysical Institute of Moscow. ERTERV Document Centre. Budapest
Bisztricsány E 1958: Geofizikai Közlemények, 7, 69--96.
Kilényi É, Sefara J 1989: Pre-Tertiary Basement Contour Map of the Carpathian Basin Beneath Austria, Czechoslovakia and Hungary. Carpatho-Balkan region. M=1:2000000, Published by ELGI. Budapest, Kartográfiai Vállalat
Pre-Tertiary Basement Contour Map of the Carpathian Basin Beneath Austria, Czechoslovakia and Hungary. Carpatho-Balkan region. M=1:2000000, ().
Pre-Tertiary Basement Contour Map of the Carpathian Basin Beneath Austria, Czechoslovakia and Hungary. Carpatho-Balkan region. M=1:2000000)| false
Gutdeutsch R, Arič K 1986: Geophysical Aspects of the Crustal Structures of the Eastern Alps Tectonic Block Models Based on the Seismicity in the East Alpine-Carpathian and Pannonian Area
International Seismological Summary, Catalogue of 1939 (ISS) Eds.: The International Union of Geodesy and Geophysics, The British Association Seismological Committee, Under the direction of Prof. Harold Jeffreys, F.R.S., Key observatory, Richmond, Surrey, 1951 refer Jámbor, Szeidovitz Gy. 1995: Preliminary Investigation of the seismic hazard of the areas identified for siting a new NPP. ETV-ERTERV.
Karnik V 1968: Seismicity of the European area. Part 1. Czechoslovak Academy of Sciences