The coda wave amplitude is used to calibrate the moment-magnitude scale of
the Vrancea (Romania) intermediate depth earthquakes. The proportionality b
etween seismic moment and coda wave amplitude is supposed to infer a relati
on connecting the magnitude, the coda amplitude and the corresponding time
in coda (measured from the origin time). The data set consists of waveforms
recorded by the Romanian telemetered network at several seismic stations,
such as Muntele Rosu (MLR), Vrancioaia (VRI), Carcaliu (CFR) and Topalu (TL
B). Our results are in good agreement with the moment-magnitude scale for V
rancea subcrustal events. The independence of the two approaches allows for
the verification of the local magnitude scale for the Vrancea subcrustal e
arthquakes. Average relations among coda amplitude, magnitude M-L and coda
duration are obtained for the above-mentioned stations.