GNGTS 2022 - Atti del 40° Convegno Nazionale

GNGTS 2022 Sessione 2.1 217 HOMOGENIZATION OF MAGNITUDES OF THE ISC ONLINE BULLETIN B. Lolli 1 , D. Randazzo 1 , G. Vannucci 1 , P. Gasperini 2,1 1 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Italy 2 Dipartimento di Fisica e Astronomia, Università di Bologna, Italy We implemented an automatic procedure to download the hypocentral data of the online bulletin of the International Seismological Centre (ISC) so that to produce in near real- time a catalog of the Euromediterranean instrumental seismicity to be used for forecasting experiments and other statistical analyses. For the interval covered by the reviewed bulletin, we adopt the ISC locations and convert Ms and mb magnitudes computed by ISC to Mw using empirical relations and merge the so obtained proxies with real Mw provided by global and Euromediterranean moment tensor catalogs. For the most recent time intervals for which the revised bulletin is not available, we adopt the preferred (prime) location provided by the bulletin and convert to Mw the Ms and mb provided by some agencies and merge them with real Mw taken from online moment tensor catalogs. For magnitude conversions we use curvilinear relations defined in previous literature and the Chi-Square regression method that takes into account the uncertainties of both the dependent and independent variables.