Analysis of seismic hazard in landslide-prone regions: criteria and example for an area of Daunia (southern Italy) |
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Authors: | V Del Gaudio P Pierri G Calcagnile |
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Institution: | 1.Dipartimento di Scienze della Terra e Geoambientali,Università degli Studi di Bari “Aldo Moro”,Bari,Italy;2.Osservatorio Sismologico, Università degli Studi di Bari “Aldo Moro”,Bari,Italy |
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Abstract: | In relation to the assessment of earthquake-induced landslide hazard, this paper discusses general principles and describes
implementation criteria for seismic hazard estimates in landslide-prone regions. These criteria were worked out during the
preparation of a hazard map belonging to the official Italian geological cartography and they are proposed as guidelines for
future compilation of similar maps. In the presented case study, we used a procedure for the assessment of seismic hazard
impact on slope stability adopting Arias intensity Ia as seismic shaking parameter and critical acceleration a
c
as parameter representing slope strength to failures induced by seismic shaking. According to this procedure, after a preliminary
comparison of estimated historical maximum values of Ia with values proposed in literature as landslide-triggering thresholds, a probabilistic approach, based on the Newmark’s model,
is adopted: it allows to estimate the minimum critical acceleration a
c
required for a slope to keep under a prefixed value, the probability of failures induced by seismic shakings expected in
a given time interval. In this way, one can prepare seismic hazard maps where seismic shaking is expressed in an indirect
way through a parameter (the critical acceleration) representing the “strength” that seismic shakings mobilise in slope materials
(strength demand) with a prefixed exceedance probability. This approach was applied to an area of Daunia (Apulia—southern
Italy) affected by frequent landslide phenomena. The obtained results indicate that shakings with a significant slope destabilisation
potential can be expected particularly in the north-western part of the area, which is exposed to the seismic activity of
Apennine tectonic structures. |
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