Abstract

In the present work, we update magnitude estimates of the instrumental catalogue of 99,780 Italian earthquakes that occurred during 1981–2002. The catalog contains a large data set of P- and S-arrival times and accurate earthquake locations. We derive duration magnitude estimates from linear regression between local magnitude calculated from Mediterranean Very Broadband Seismographic Network (MedNet) and the corresponding seismic-signal durations at the national network Rete Sismica Nazionale Centralizzata (rsnc). We introduce a station correction factor Scj because of most of the stations located in southern Italy show large residuals that appear to be of regional importance. The relation obtained:  
formula
Log M0ML and MWML relations are also computed in the range of 3.5–5.8 from regional centroid moment tensor estimation of medium-strong Italian earthquakes, by linear regressions. We obtained best least-square fits for:  
formula
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