Options
Di Gregorio, S.
Loading...
Preferred name
Di Gregorio, S.
5 results
Now showing 1 - 5 of 5
- PublicationOpen AccessThe Catania 1669 lava eruptive crisis: simulation of a new possible eruption(2001-09)
; ; ; ; ; ; ;Crisci, G. M.; Department of Earth Sciences,University of Calabria, Arcavacata ;Di Gregorio, S.; Department of Mathematics,University of Calabria, Arcavacata ;Rongo, R.; Department of Earth Sciences,University of Calabria, Arcavacata, University of Calabria, Arcavacata ;Scarpelli, M.; Department of Earth Sciences,University of Calabria, Arcavacata, University of Calabria, Arcavacata ;Spataro, W.; Department of Mathematics,University of Calabria, Arcavacata, ;Calvari, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; SCIARA (Smart Cellular Interactive Automata for modeling the Rheology of Aetnean lava flows, to be read as “shea’rah”), our first two-dimensional Cellular Automata model for the simulation of lava flows, was tested and validated with success on several lava events like the 1986/87 Etnean eruption and the last phase of the 1991/93 Etnean one. Real and simulated events are satisfying within limits to forecast the surface covered by the lava flow. Moreover, improved versions have been adopted in testing other real lava flows of Mount Etna and of Reunion Island (Indian Ocean). The model has been applied with success in the determination of risk zones in the inhabited areas of Nicolosi, Pedara, S. Alfio and Zafferana (Sicily). The main goal of the present work has been the verification of the effects, in volcanic risk terms, in the Etnean area from Nicolosi to Catania, of a eruptive crisis similar to the event that occurred in 1669, as if the episode would happen nowadays. Catania has been severely interested in some major Etnean events in history, the most famous one being, namely, the 1669 eruption, involving 1 km3 of lava during 130 days. The simulation of lava tubes and the usage of different histories within the experiments have been crucial in the determination of a new risk area for Catania. In fact, simulations carried out without the introduction of lava tubes, never involved the city, proving the fact that lava tubes, played a fundamental role in the 1669 Catania lava crisis.238 168 - PublicationRestrictedSusceptibility assessment of subaerial (and/or) subaqueous debris-flows in archaeological sites, using a cellular model(2015)
; ; ; ; ; ;Lupiano, V.; Università della Calabria ;Avolio, M. V.; Università della Calabria ;Anzidei, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Crisci, G. M.; Università della Calabria ;Di Gregorio, S.; Università della Calabria; ; ; ; ; ; ; ; ; ; ; ;Lollino, G.; Inst. for Geo-hydrological Protection, National Research Council (CNR) ;Giordan, D.; Inst. for Geo-hydrological Protection, National Research Council (CNR ;Monteanu, C.; Faculty of Geology and Geophysics, University of Bucharest ;Christaras, B.; Department of Geology, Aristotle University of Thessaloniki ;Yoshinori, I.; Geo Research Institute ;Margottini, C.; ISPRA-Inst. f. Env. Protection&Research, Geological Survey of Italy; ; ; ; ; This study analyzes landslide susceptibility for archaeological sites in the Albano lake and Nemi lake areas, both in subaerial and in submerged zones by simulations of SCIDDICA-SS2, a Cellular Automata (CA) model for subaerial, subaqueous, both subaerial-subaqueous debris/mud/granular flows. Successful applications of SCIDDICA-ss2 permitted to simulate past events for the Albano lake area. New numerical simulations allowed susceptibility evaluations for gravitational instability related to the abovementioned archaeological sites.144 21 - PublicationRestrictedPredicting the impact of lava flows at Mount Etna, Italy(2010-04-28)
; ; ; ; ; ; ; ; ; ;Crisci, G.; Department of Earth Sciences, University of Calabria, 87036 Rende, Italy ;Avolio, M. V.; Department of Mathematics, University of Calabria, 87036 Rende, Italy ;Behncke, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;D'Ambrosio, D.; Department of Mathematics, University of Calabria, 87036 Rende, Italy ;Di Gregorio, S.; Department of Mathematics, University of Calabria, 87036 Rende, Italy ;Lupiano, V.; Department of Earth Sciences, University of Calabria, 87036 Rende, Italy ;Neri, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Romgo, R.; Department of Earth Sciences, University of Calabria, 87036 Rende, Italy ;Spataro, W.; High Performance Computing Centre, University of Calabria, 87036 Rende, Italy; ; ; ; ; ; ; ; Forecasting the time, nature, and impact of future eruptions is difficult at volcanoes such as Mount Etna, in Italy, where eruptions occur from the summit and on the flanks, affecting areas distant from each other. Nonetheless, the identification and quantification of areas at risk from new eruptions are fundamental for mitigating potential human casualties and material damage. Here, we present new results from the application of a methodology to define flexible high‐resolution lava invasion susceptibility maps based on a reliable computational model for simulating lava flows at Etna and on a validation procedure for assessing the correctness of susceptibility mapping in the study area. Furthermore, specific scenarios can be extracted at any time from the simulation database, for land use and civil defense planning in the long term, to quantify, in real time, the impact of an imminent eruption, and to assess the efficiency of protective measures.834 32 - PublicationRestrictedRevisiting the 1669 Etnean eruptive crisis using a cellular automata model and implications for volcanic hazard in the Catania area(2003)
; ; ; ; ; ; ;Crisci, G. M.; Department of Earth Sciences, University of Calabria, Arcavacata ;Di Gregorio, S.; Department of Mathematics, University of Calabria, Arcavacata ;Rongo, R.; Department of Earth Sciences, University of Calabria, Arcavacata ;Scarpelli, M.; Department of Earth Sciences, University of Calabria, Arcavacata ;Spataro, W.; Department of Mathematics, University of Calabria, Arcavacata ;Calvari, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; Cellular Automata provide an alternative approach to standard numerical methods for modelling some complex natural systems, the behaviour of which can be described in terms of local interactions of their constituent parts. SCIARA is a 2-D Cellular Automata model which simulates lava flows. It was tested on, validated by, and improved on several Etnean lava events such as the 1986^1987 eruption and the first and last phase of the 1991^1993 event. With respect to forecasting the surface covered by the lava flows, the best results were acceptable. The model has been used to determine hazard zones in the inhabited areas of Nicolosi, Pedara, S. Alfio and Zafferana (Sicily, Italy). The main goal of the current work in the Etnean area from Nicolosi to Catania has been the verification of the volcanic hazard effects of an eruptive crisis similar to the event that occurred in 1669. The simulation uses the volcanic data of the 1669 eruption with present-day morphology. Catania has been affected by some historical Etnean events, the most famous one being the 1669 eruption, involving 1 km3 of lava erupted over the course of 120 days. The simulation of ephemeral vents and the use of different histories within the experiments have been crucial in the determination of a new hazard area for Catania. In fact, during the simulation the city was never affected without the introduction of ephemeral vents, proving the fact that lava tubes played a fundamental role in the 1669 Catania lava crisis.148 24 - PublicationOpen AccessDefining high-detail hazard maps by a cellular automata approach: application to Mount Etna (Italy)(2011-12)
; ; ; ; ; ; ; ; ; ;Rongo, R.; Università della Calabria, Dipartimento di Scienze della Terra, Arcavacata di Rende (Cosenza), Italy ;Avolio, M. A.; Università della Calabria, Dipartimento di Matematica, Arcavacata di Rende (Cosenza), Italy ;Behncke, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;D'Ambrosio, D.; Università della Calabria, Dipartimento di Matematica, Arcavacata di Rende (Cosenza), Italy ;Di Gregorio, S.; Università della Calabria, Dipartimento di Matematica, Arcavacata di Rende (Cosenza), Italy ;Lupiano, V.; Università della Calabria, Dipartimento di Scienze della Terra, Arcavacata di Rende (Cosenza), Italy ;Neri, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Spataro, W.; Università della Calabria, Dipartimento di Matematica, Arcavacata di Rende (Cosenza), Italy ;Crisci, G. M.; Università della Calabria, Dipartimento di Scienze della Terra, Arcavacata di Rende (Cosenza), Italy; ; ; ; ; ; ; ; The individuation of areas that are more likely to be affected by new events in volcanic regions is of fundamental relevance for the mitigation of the possible consequences, both in terms of loss of human life and material properties. Here, we describe a methodology for defining flexible high-detail lava-hazard maps and a technique for the validation of the results obtained. The methodology relies on: (i) an accurate analysis of the past behavior of the volcano; (ii) a new version of the SCIARA model for lava-flow simulation (based on the macroscopic cellular automata paradigm); and (iii) high-performance parallel computing for increasing computational efficiency. The new release of the SCIARA model introduces a Bingham-like rheology as part of the minimization algorithm of the differences for the determination of outflows from a generic cell, and an improved approach to lava cooling. The method is here applied to Mount Etna, the most active volcano in Europe, and applications to landuse planning and hazard mitigation are presented.1501 243