ISIDe, an Italian Seismic Data Base with minimum magnitude of completeness ML 1.8

Abstract

ISIDe, the Italian Seismic Instrumental and parametric DatabasE, includes today more than 17000 earthquakes occurred in Italy and surrounding seas since April 16th 2005, ranging from magnitude ML 0.2 to ML 5.7. All the ML are computed from synthetic Wood-Anderson records obtained from horizontal broad band and very-broad band registrations. The minimum magnitude of completeness is ML 1.9, as computed from the cumulated Gutenberg-Richter distribution. The ML 4.8 event occurred in the Gargano peninsula (southern Italy) on May 29th 2006 is the crustal earthquake of maximum magnitude included in the catalog; it was followed on December 10th 2006 by an ML 4.5 earthquake, about 40 km northeast of the previous event. The largest earthquake of the catalog (ML 5.7) occurred on October 26th 2006 in the southern Tyrrhenian sea at a depth of 220 km. Although ISIDe is spanning only the last three years and half of Italian seismicity, it is unprecedented in Italy for completeness and homogeneity and represents an optimum test data set for small and moderate seismicity pattern model verification. ISIDe is now available at http://iside.rm.ingv.it/.