Publication Date:
2021-07-14
Description:
This paper describes the model implementation
and presents results of a probabilistic seismic hazard assess-
ment (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 computa-
tion, 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 surfi-
cial topography in the hazard calculation, which influences
source-to-site distances. Hazard calculations have been car-
ried 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). Re-
sults 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 engineer-
ing 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 mo-
tion 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 re-
duction.
Description:
Published
Description:
1999–2015
Description:
5T. Modelli di pericolosità sismica e da maremoto
Description:
JCR Journal
Keywords:
Mt. Etna, Seismic Hazard, GMPE
;
04.06. Seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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