Relations for local magnitude at seismic station Berggiesshübel

Summary New calibrating functions for the local magnitude M_L based on the maximum ratio of amplitude and period of the S_g - wave, the short-period surface wave and the duration of the whole seismogram and its part starting with the arrival of the S_g -wave recorded by the short-period vertical seismograph at Berggiesshübel (BRG) have been derived. The consistency of these magnitudes was tested for weak earthquakes and industrial blasts in the magnitude range of 1.7–3.5 and epicentral distances up to 80 km. Their differences were 0.2 of a magnitude unit at most, with the exception of the surface wave magnitudes which were systematic by about 0.9 of a magnitude unit greater. The calibrating function for the S_g - wave was compared with the functions for M_L(POT) and M_L(TRI) which were derived by other authors for several Central European seismic stations, including BRG.