The local magnitude M(I), at the seismological station Pruhonice (PRU) was converted into surface wave magnitude M(S) using the formula M(S) = -3.2 + 1.45 M(L) and the seismic wave energy was estimated using the relation log E (Joule) = 1.2 + 2.0 M(r). It was proposed to apply the same conversion formulae at seismological stations Kasperske Hory (KHC) and Berggiesshubel (BRG) where the calibrating functions for local magnitudes were determined for the same set of earthquakes with common reference magnitudes as in the case of the PRU station.