%A Andrzej Kijko %A Bernard Drzezla %A Stankiewicz Tadeusz %J Acta Geophysica Polonica %T BIMODAL character of the distribution of extreme seismic events in Polish mines %X A comprehensive analysis of the empirical bimodal distribution of extreme seismic events in Polish mines is presented. Two mathematical models describing a bimodal distribution of seismic energy, formulation of two hypotheses explaining the observed bimodality and future infestations for verification of these hypotheses are consider. %N 2 %P 157-166 %V XXXV %D 1987 %I Polish Academy of Science %L epos1543