Publication Date:
2017-04-04
Description:
A probabilistic seismic hazard analysis (PSHA) was carried out for the SE sector of Sicily, an area characterized by highest levels of seismic hazard in Italy and high exposure, both in terms of cultural heritage and of critical industrial facilities. Compared to the Italian reference PSH map (MPS04), this study is based on most updated information about regional seismic sources and ground-motion attenuation. Epistemic uncertainties associated with the input elements of the computational model were taken into account following a logic-tree approach. Special care was devoted to define the regional source zones model by considering four alternative models, which share the zones defining the boundary conditions of the study area but differ in the seismotectonic characterization of SE Sicily. Seismic hazard was assessed in terms of PGA, PGV, acceleration and displacement elastic response spectra on rock for four return periods (30, 50, 475, 975 years). A disaggregation analysis was then performed for some sites of interest. Results confirm the very high hazard of the area, with expected values of PGA (at 10% probability of exceedance in 50 years) slightly higher than the reference MPS04 map. Strong differences emerge instead between the acceleration response spectra of this study and the reference ones, for the longest return periods.
Description:
Published
Description:
19-36
Description:
4.1. Metodologie sismologiche per l'ingegneria sismica
Description:
4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
Description:
JCR Journal
Description:
open
Keywords:
Probabilistic seismic hazard assessment
;
SE Sicily
;
04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
;
04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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