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Fusi, Nicoletta
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Fusi, Nicoletta
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- PublicationOpen AccessEvidence of mud diapirism and coral colonies in the ionian sea (central mediterranean) from high resolution chirp sonar survey(2006-03-20)
; ; ; ;Fusi, N.; Dept. of Geological Sciences and Geotechnologies – Milano-Bicocca University ;Savini, A.; Dept. of Geological Sciences and Geotechnologies – Milano-Bicocca University ;Corselli, C.; Dept. of Geological Sciences and Geotechnologies – Milano-Bicocca University; ; A chirp sonar survey in the Ionian Sea investigated the Calabrian margin, the Calabrian accretionary wedge, the Taranto Trench and the Apulian foreland. Shallow tectonics structures have been related to deeper ones, recognised on CROP seismic profiles. The identified echo characters have been compared with those described in the modern literature and have been related to different kinds of sediments, on the basis of core samples. Based on echo character and morphology we have recognised: 1) A widespread presence of mounds, up to 50 m high, occurring on the Apulian plateau as isolated mounds in the deepest zones (1600-800 m) and in groups in the shallower ones (800-600 m); they have been interpreted as coral mounds, according to a recent discovery of living deep water coral colonies in this zone. 2) Some mud diapirs, isolated or in groups of two or three elements, widespread in the whole study area. In analogy of what has been observed on the Mediterranean Ridge, their presence suggests the activity of deep tectonic structures (thrusts and faults) and a reduced thickness (or absence) of Messinian evaporites in this part of the Ionian Sea.246 708 - PublicationOpen AccessStructural settings of the carbonatic "basament" and its relationship with magma uprising in the gulf of Naples (Southern Italy)(1996-05)
; ;Fusi, N.; Dipartimento di Scienze della Terra, Milano, ItalyThe carbonatic "basement" of the Gulf of Naples, a peri-tyrrhenian basin located on the western side of the Southern Apenninic chain, was studied in detail by means of seismic reflection profiles both on the mainland and in the sea. The carbonatic "basement" dips toward the north-west with an angle of 100 and is affected by brittle extensional tectonics. This structural setting is related to the extension of the Tyrrhenian Sea, which caused the development of horst and graben-like structure along the western margin of the Apennines. Some normal faults with a regional relevance were recognised: 1 ) a N 110° trending fault responsible for the sinking of the carbonic "basement" below Mount Somma-Vesuvius; 2) a N 1O° trending fault, along which five sub- marine volcanoes are aligned; 3) a N70° fault, which separates the Gulf of Naples from the Gulf of Salerno. The first two faults, arranged radially with respect to the shallow magmatic chamber of Phlegraean Fields, are interpreted as the main uprising route for magma in this area. The carbonatic "basement"cannot be recognized in seismic profiles in the Phlegraean area; a tectonic feature responsible for this is hypothesised.155 308 - PublicationRestrictedVolcanic spreading of Vesuvius, a new paradigm for interpreting its volcanic activity(2005)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Borgia, A.; European Development and Research Agency ;Tizzani, P.; Istituto Nazionale di Geofisica e Vulcanologica, Osservatorio Vesuviano ;Solaro, G.; Universita` Federico II, Dipartimento di Geofisica e Vulcanologia ;Manzo, M.; Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell'Ambiente ;Casu, F.; Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell'Ambiente ;Luongo, G.; Universita` Federico II, Dipartimento di Geofisica e Vulcanologia ;Pepe, A.; Universita` Federico II, Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni ;Berardino, P.; Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell'Ambiente ;Fornaro, G.; Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell'Ambiente ;Sansosti, E.; Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell'Ambiente ;Ricciardi, G. P.; Istituto Nazionale di Geofisica e Vulcanologica, Osservatorio Vesuviano ;Fusi, N.; Universita Milano-Bicocca, Dipartimento di Scienze Geologiche e Geotecnologie ;Di Donna, G.; Comune di Torre del Greco,Vesuvius Information Office ;Lanari, R.; Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell'Ambiente; ; ; ; ; ; ; ; ; ; ; ; ; We integrate geologic, structural, leveling and Differential SAR Interferometry data to show that Vesuvius began to spread onto its sedimentary substratum about 3,600 years ago. Moreover, we model the detected deformation with a solution of the lubrication approximation of the Navier-Stokes equations to show that spreading may continue for about 7,200 years more. Correlation of volcanic spreading with phases of the eruptive activity suggests that Plinian eruptions, which are thought to pose the major hazard, are less likely to occur in the near future.222 104 - PublicationOpen AccessSlow-to-fast transition of giant creeping rockslides modulated by undrained loading in basal shear zones(2020)
; ; ; ; ; ; ; Giant rockslides are widespread and sensitive to hydrological forcing, especially in climate change scenarios. They creep slowly for centuries and then can fail catastrophically posing major threats to society. However, the mechanisms regulating the slow-to-fast transition toward their catastrophic collapse remain elusive. We couple laboratory experiments on natural rockslide shear zone material and in situ observations to provide a scale-independent demonstration that short-term pore fluid pressure variations originate a full spectrum of creep styles, modulated by slip-induced undrained conditions. Shear zones respond to pore pressure increments by impulsive acceleration and dilatancy, causing spontaneous decel- eration followed by sustained steady-rate creep. Increasing pore pressure results in high creep rates and eventual collapse. Laboratory experiments quantitatively capture the in situ behavior of giant rockslides and lay physically-based foundations to understand the collapse of giant rockslides.66 5