TY  - JOUR
PY  - 2017//
TI  - When probabilistic seismic hazard climbs volcanoes: the Mt. Etna case, Italy - Part 2: computational implementation and first results
JO  - Natural hazards and earth system sciences
A1  - Peruzza, Laura
A1  - Azzaro, Raffaele
A1  - Gee, Robin
A1  - D'Amico, Salvatore
A1  - Langer, Horst
A1  - Lombardo, Giuseppe
A1  - Pace, Bruno
A1  - Pagani, Marco
A1  - Panzera, Francesco
A1  - Ordaz, Mario
A1  - Suarez, Miguel Leonardo
A1  - Tusa, Giuseppina Tusa
SP  - 1999
EP  - 2015
VL  - 17
IS  - 11
N2  - This paper describes the model implementation and presents results of a probabilistic seismic hazard assessment (PSHA) for the Mt. Etna volcanic region in Sicily, Italy, considering local volcano-tectonic earthquakes. Working in a volcanic region presents new challenges not typically faced in standard PSHA, which are broadly due to the nature of the local volcano-tectonic earthquakes, the cone shape of the volcano and the attenuation properties of seismic waves in the volcanic region. These have been accounted for through the development of a seismic source model that integrates data from different disciplines (historical and instrumental earthquake datasets, tectonic data, etc.; presented in Part 1, by Azzaro et al., 2017) and through the development and software implementation of original tools for the computation, such as a new ground-motion prediction equation and magnitude-scaling relationship specifically derived for this volcanic area, and the capability to account for the surficial topography in the hazard calculation, which influences source-to-site distances. Hazard calculations have been carried out after updating the most recent releases of two widely used PSHA software packages (CRISIS, as in Ordaz et al., 2013; the OpenQuake engine, as in Pagani et al., 2014). <br><br>RESULTS are computed for short- to mid-term exposure times (10 % probability of exceedance in 5 and 30 years, Poisson and time dependent) and spectral amplitudes of engineering interest. A preliminary exploration of the impact of site-specific response is also presented for the densely inhabited Etna's eastern flank, and the change in expected ground motion is finally commented on. These results do not account for M  >  6 regional seismogenic sources which control the hazard at long return periods. However, by focusing on the impact of M  <  6 local volcano-tectonic earthquakes, which dominate the hazard at the short- to mid-term exposure times considered in this study, we present a different viewpoint that, in our opinion, is relevant for retrofitting the existing buildings and for driving impending interventions of risk reduction.<p />  <p>Language: en</p>
LA  - en
SN  - 1561-8633
UR  - http://dx.doi.org/10.5194/nhess-17-1999-2017
ID  - ref1
ER  -