Abstract
In this work we analyze earthquake parameters published in the Seismic Bulletin of the Istituto Nazionale di Geofisica e Vulcanologia (INGV) The analysis and the interpretation of the digital signals, done by specialized employees daily, produce most of the seismological information that comprises INGVs earthquake bulletins. After a brief introduction on the criteria we use to obtain seismic parameters, this paper will review the processing procedures employed over a period of sixteen years from 1988 to September 2003. This study also addresses the issue of the comparison between Magnitude calculated on signal duration (Md) and on amplitude (ML) and the lack of a correct calibration between them . A completeness analysis of the whole bulletin performed using both the Stepp and the Habermann techniques shows the importance of considering changes in the seismicity rate and in the geometry of the seismological network. To conclude this excursus, we calculated the errors of hypocentral locations and the detection capacity of individual seismic stations. This final step stresses the increasing improvement of the INGV seismic network over the past 16 years.
Highlights
During the first five years of the nineties, the Istituto Nazionale di Geofisica was involved in a European project named «EUROBULL»
The aim of the EUROBULL group was to compile a high quality European bulletin to be used both as a reference, to evaluate bulletins produced by international networks, and for scientific purposes
I was directly involved in the software implementation and Giuseppe Smriglio, a very helpful person who was the manager of the Data Centre, let me modify the Italian bulletin procedures adapting them to the European purposes
Summary
During the first five years of the nineties, the Istituto Nazionale di Geofisica (nowadays INGV) was involved in a European project named «EUROBULL». The aim of the EUROBULL group was to compile a high quality European bulletin to be used both as a reference, to evaluate bulletins produced by international networks, and for scientific purposes. I was directly involved in the software implementation and Giuseppe Smriglio, a very helpful person who was the manager of the Data Centre, let me modify the Italian bulletin procedures adapting them to the European purposes. The EUROBULL group produced a series of control routines to test the quality of the new bulletin, so we had the opportunity to apply the same test to the Italian bulletin. This work, that analyzes sixteen years of INGV bulletins, recalls the efforts to improve the network and the quality of the data for which Giuseppe was one of the principal promoters
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