by R. MAAZ1 and G. PURCARU2
1 Central Earth Physics Institute, Burgweg, Jena, Germany
2 Mining Research Institute Seismotectonical Research Group Bucharest
Some problems of the frequency-magnitude distributions are analyzed and the possibilities of extrapolation of these relations in the range of small and great magnitudes are considered from the point of view of earthquake prediction. One of these distributions, the lognormal magnitude distribution is studied in detail. Also the confidence intervals of the coefficients of the corresponding frequency – magnitude relation and some discussions are given.