1,721,006 research outputs found
Probabilistic assessment of the earthquake-induced soil liquefaction hazard at national scale: macrozonation of the Italian territory
No full textSeismic soil liquefaction is one of the most relevant phenomena of ground failure that may induce disastrous consequences on structures, infrastructures and the environment. This article presents the first probabilistic zonation for liquefaction hazard at national scale, carried
out with reference to Italy. Macrozonation is the geospatial identification of areas in a national territory that, in case of an earthquake, may be affected by phenomena associated to soil liquefaction by using a probabilistic approach. Zonation of a large territory for earthquake-induced liquefaction hazard seems to be, at least at a first glance, an unachievable goal, since liquefaction occurs at a very local scale. In this study, the strategy for macrozoning consists in combining and processing geospatial predictors, which represent both ground susceptibility to liquefaction and expected seismic loading. A database was built for the Italian territory including the explanatory variables adopted as proxies for soil density, degree of saturation and ground motion intensity. This database represents the starting point for the application of a geospatial methodology based on logistic regression for assessing the liquefaction hazard in Italy. The outcomes are macrozonation charts computed for three return periods (i.e. 475, 975 and 2475 years) with a spatial resolution on the order of 500 m. The mapping was validated by superimposing historical liquefaction and then compared with the coarser charts recently delivered for Europe. Despite their intrinsic limitations, national scale maps of liquefaction hazard may support decision-makers, civil protection agencies, insurance and re-insurance companies to fund zonation projects at regional or even at urban/suburban scale
Tools for rapid seismic response assessment of strategic facilities under GIS environment: applications to Italian seaports and embankment dams
No full textValutazione in Ambiente GIS del Danno Sismico di Strutture Portuali Marittime: il Caso del Porto di Gioia Tauro
No full textDefinition of Seismic Input at the Archeological Site of Marte Ultore Temple in Rome (Italy)
No full textNonlinear broadband simulation of the Mw 6.0 May 29, 2012 Emilia earthquake in Northern Italy
No full textWe present the results of the numerical simulation of the May 29, 2012 Emilia Romagna earthquake in Northern Italy using an approach that computes synthetic seismograms associated to earthquake scenarios by combining broadband synthetic seismograms (0–10 Hz) obtained using the UCSB broadband code with nonlinear ground response analyses carried out using the program NOAH. The comparison with the recorded waveforms allowed validating the predictive capability of the adopted method in the proximity of the epicenter. The main limitation of the study is the inappropriateness of 1D modeling in a region characterized by a steep variation of the roof of the buried bedrock
New Soil Factors for the Italian Building Code (NTC08) Derived from 1D fully Stochastic Ground Response Analyses
No full textSeismic risk assessment of seaports using GIS: the port of Gioia Tauro in Southern Italy
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