1,721,539 research outputs found
Archaeological indicators of sea level change and land movements in recent millennia: examples from the Mediterranean
No full textRecent results indicate for the central Mediterranean significant variations of the relative sea level change in 2000 years, suggesting that the observed signal can be addressed to eustatism and global isostatic adjustment. The average modern eustatic sea level rise at 1-2 mm year recorded by tide gauges, has not been always constant since the roman time, but likely started 100-150 years ago.
Here we show an overview on the late Holocene sea level change and vertical rate of land movements in the Mediterranean, as shown by archaeological markers, geological, geomorphologic and biological data.PublishedRimini3.3. Geodinamica e struttura dell'interno della Terraope
Archaeological indicators of sea level change and land movements in recent millennia: examples from the Mediterranean
No full textRecent results indicate for the central Mediterranean significant variations of the relative sea level change in 2000 years, suggesting that the observed signal can be addressed to eustatism and global isostatic adjustment. The average modern eustatic sea level rise at 1-2 mm year recorded by tide gauges, has not been always constant since the roman time, but likely started 100-150 years ago.
Here we show an overview on the late Holocene sea level change and vertical rate of land movements in the Mediterranean, as shown by archaeological markers, geological, geomorphologic and biological data.PublishedRimini3.3. Geodinamica e struttura dell'interno della Terraope
Sea level changes and vertical land movements in the Mediterranean
No full textTo estimate Mediterranean sea-level changes is mandatory to understand the past records and analyze these results with current instrumental observations collected along the coastlines which provide data on the vertical relative motions between sea and land.PublishedSofia, Bulgaria3.3. Geodinamica e struttura dell'interno della Terraope
Sea level changes and vertical land movements in the Mediterranean
No full textTo estimate Mediterranean sea-level changes is mandatory to understand the past records and analyze these results with current instrumental observations collected along the coastlines which provide data on the vertical relative motions between sea and land.PublishedSofia, Bulgaria3.3. Geodinamica e struttura dell'interno della Terraope
The marine digital terrain model of the Panarea caldera (Aeolian Islands, Southern Italy)
No full textA Marine Digital Elevation Model (MDEM) of the still active volcanic area of Panarea caldera is presented in this paper. A fast and accurate survey was performed by means of the Differential Global Positioning System (DGPS) geodetic technique coupled with an echo-sounding gear and a real time navigation software. The instrumentation was installed on board of a low draught boat in order to collect data starting from the bathymeter of one meter. Planar positions and depths were obtained with average accuracies of 30 cm and 10 cm respectively providing a 3D map of the seafloor useful for geomorphological, geophysical and volcanic hazard applications.JCR Journalope
Coastal retreat and marine flooding scenario for 2100: A case study along the coast of Maddalena peninsula (southeastern Sicily)
No full textANZIDEI M., SCICCHITANO G., TARASCIO S., DE GUIDI G., MONACO C., BARRECA G., MAZZA G., SERPELLONI E. & VECCHIO A., Coastal retreat and marine flooding scenario for 2100: a case study along the coast of Maddalena Peninsula (southeastern Sicily). (IT ISSN 0391-9838, 2018). The coastal area of southeastern Sicily (Italy) is undergoing weak land subsidence, heavy coastal retreat, land flooding and exposed to severe storms associated with high-waves, also in consequence of the global sea level rise, which is expected to raise even more that 1 m by 2100 AD depending on different estimates. This value will be even larger in subsiding coasts, entailing widespread environmental changes, coastal retreat, marine flooding and loss of land, which will be subtracted to human activities. To understand the impact of rising sea level on the coast of Maddalena Peninsula, near the town of Siracusa, we realized a very high resolution Digital Terrain Model (DTM) through aerial photogrammetric surveys, obtained by Unmanned Aerial Vehicles (UAV) on which we projected the expected coastline for 2100 AD. Here we show a detailed marine flooding scenario for 2100, as generated from: i) high resolution DTM, ii) rate of land subsidence from GPS data and iii) predicted sea level projections from the IPCC AR5 reports (RCP2.6 and RCP8.5). Our analysis estimates a maximum relative sea level rise at 0.20 m and 0.65 m for 2050 AD and 2100 AD, respectively for AR 8.5 scenario. The increased sea levels will cause relevant morphological changes to the investigated coast with a maximum beach retreat of 27 m and a loss of land of 7400 m2, affecting building integrity and people safety
The 2002-2003 Submarine Gas Eruption At Panarea Island (Aeolian Archipelago, Italy): Structure And Volcanology Of The Seafloor And Implications For Hazard Evaluation
No full textAsubmarinegaseruptionstartedinNovember2002offshoreofPanareavolcano(AeolianIslands, Italy). Theintensityofthe
gas emissionandtheconsiderableanomalies of thegeochemical andgeophysical parameters havealarmedthevolcanological
communityandtheItalianCivil ProtectionAgencyonthepossibilitythat thisactivitymayrepresent avolcanicunrest at Panarea
volcano. WeusedahighresolutionMarineDigital TerrainModel(MDTM), with0.5maccuracy, anddetailedunderwatersurveys
byscubadivingtostudytheexhalationcentresandthegeological, morphological andstructural featuresof theseafloor andto
clarifytherelationshipsbetweengasventsdistribution,submarinevolcanologicalstructuresandtherecentdeformationofthisarea.
Theunderwatersurveysrevealedanexhalativefieldcharacterisedby21mainactivegasventsandcratersfrommetrestotensof
metres indiameter, anda pervasive exhalationfromthe seafloor; hundreds of fossil craters associatedwithgas pipes and
hydrothermal alterationarealsopresent ontheseafoor: craters, pipesandconduitsarenot associatedwithjuveniledepositsand
relatetoalongstandinghistoryof gasexhalationanderuptions.
WepresentthefirstgeologicalsketchmapoftheseafloorsurroundingtheexhalativeareaandestablishtheroleofNE-andNW-
trending fractures as them a in pathways for the gas exhalation
The 2002-2003 submarine gas eruption at Panarea (Aeolian Islands, Italy): study of the seafloor and implications for volcanic hazard assessment.
No full textIntense submarine gaseous exhalation, which produced a spectacular submarine fumarolic field, has started since November 2002 in the Panarea volcanic complex, which includes Dattilo, Panarelli, Lisca Bianca, Bottaro and Lisca Nera islets (Aeolian Islands, Italy). The gas eruption at Panarea occurred in coincidence with the parossistic volcanic eruption at Stromboli island, located just few tens of kilometres to the north, and the Mt Etna eruption. This contemporaneity imposes to carefully consider the volcanological implications of such phenomenon, as Panarea is currently considered an extinct volcano.Submarine volcanic activity in the Aeolian area has been known since Roman times, and several historians reported exhalation episodes and submarine eruptions, also in coincidence with eruptions at Mt Etna and Stromboli.Recent volcanological, structural, geochemical and geodetical surveys on Panarea island have identified a positive gravimetric anomaly, the presence of tectonic discontinuities and several centres of geothermal fluid emission, illustrating the presence of an active geothermal system beneath the volcano.We used the Marine Digital Terrain Model (MDTM), purposedly performed to highlight the bathymetry with a 0,5 m precision, detailed surveys by scuba diving prospections and GPS data, to study the exhalation centres and the morphological-structural features of the seafloor with the aim to clarify the relationships between gaseous exhalation, volcanological submarine structures and crustal deformations in this area
Analisi di modelli digitali del terreno dell’isola di Panarea (isole Eolie) estratti con differenti metodologie.
No full textIn questo lavoro vengono integrati e confrontati tre rilievi aero-fotogrammetrici acquisiti nel 1987 e 2003, un rilievo LIDAR effettuato nel 2004 e due rilievi batimetrici RTK multibeam realizzati nel 2002-2004 relativi all’isola di Panarea (Arcipelago delle isole Eolie), e alla porzione sottomarina in prossimità di alcuni degli isolotti di Dattilo, Panarelli, Lisca Nera, Bottaro, Lisca Bianca e Basiluzzo (figura 1); lo scopo è quello di fornire uno strumento di grande utilità per la descrizione morfologica completa dell’area che nel novembre 2002, in concomitanza con le eruzioni dei vulcani Etna e Stromboli, è stata interessata da una rilevante emissione gassosa associata ad un intenso campo di fratturazione, localizzata in un’area di circa 2.3 km2 tra gli isolotti sopra citati.
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