ACCEPTED on ANNALS of GEOPHYSICS, 62, 2019; Doi: 10.4401/Ag-8308 ‟AREAPPRAISAL OFTHE 1968 VALLE DEL BELÌCE SEISMIC SEQUENCE
ACCEPTED ON ANNALS OF GEOPHYSICS, 62, 2019; Doi: 10.4401/ag-8308 ‟A REAPPRAISAL OF THE 1968 VALLE DEL BELÌCE SEISMIC SEQUENCE (WESTERN SICILY): A CASE STUDY OF INTENSITY ASSESSMENT WITH CUMULATED DAMAGE EFFECTS„ Raffaele Azzaro1*, Maria Serafina Barbano2, Andrea Tertulliani1, Claudia Pirrotta2 1) Istituto Nazionale di Geofisica e Vulcanologia, Italy 2) Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Italy ‟A REAPPRAISAL OF THE 1968 VALLE DEL BELÌCE SEISMIC SEQUENCE (WESTERN SICILY): A CASE STUDY OF INTENSITY ASSESSMENT WITH CUMULATED DAMAGE EFFECTS„ Raffaele Azzaro1*, Maria Serafina Barbano2, Andrea Tertulliani1, Claudia Pirrotta2 3) Istituto Nazionale di Geofisica e Vulcanologia, Italy 4) Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Italy ABSTRACT In 1968, six earthquakes with magnitude between 5.1 and 6.4 destroyed or heavily damaged several towns in the Valle del Belìce (western Sicily), causing some three hundred fatalities. There have been some critical issues in the intensity assessment however in the macroseismic studies produced over the years , since the MCS scale was used as an estimation of shaking rather than a representation of the damage scenario; in practise, intensity was assigned for each earthquake of the sequence disregarding the effect of the cumulative damage. The case-study of the 2016-17 earthquakes in Central Italy reflected the difficulty in estimating the intensity in localities repeatedly hit by strong shocks, producing macroseismic parameters (epicentre, magnitude) inconsistent with the instrumental ones. As for the 1968 Valle del Belìce sequence, the Parametric Catalogue of Italian Earthquakes CPTI15 reports the macroseismic parameters, owing to the inadequacy of the seismic network operating in Italy in that period.
[Show full text]