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Bulletin of the Seismological Society of America; February 2007; v. 97; no. 1B; p. 128-139; DOI: 10.1785/0120050258
© 2007 Seismological Society of America
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Local and Duration Magnitude Determination for the Italian Earthquake Catalog, 1981–2002

B. Castello1, M. Olivieri1 and G. Selvaggi2

1 Istituto Nazionale di Geofisica e Vulcanologia
Centro Nazionale Terremoti
Via di Vigna Murata, 605
00176 Rome, Italy
 (B.C., M.O.)

2 Istituto Nazionale di Geofisica e Vulcanologia
Centro per la Sismologia e l’Ingegneria Sismica
Via Castello d’Aquino 13
83035 Grottaminarda (AV), Italy
 (G.S.)

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 001

Log M0 – ML and MW – ML 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 002






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