Tectonic, volcanic and hydrothermal features of a submarine portion of the Aeolian arc (Tyrrhenian Sea)

Gamberi, Fabiano; Marani, M.; Savelli, C.

doi:10.1016/s0025-3227(97)00020-0

Cited by 68 publications

(61 citation statements)

References 31 publications

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“…Panarea volcano is the emergent portion of a submarine stratovolcano ∼1,600 m high and ∼18 km across (Gabbianelli et al 1993;Gamberi et al 1997;Favalli et al 2005) characterized by a large and ellipsoidal shaped platform, at ∼100 m. The emergent portion of this platform forms Panarea Island (421 ma.s.l.) and the small archipelago with the islets of Basiluzzo, Dattilo, Panarelli, Lisca Bianca, Bottaro, Lisca Nera, and Le Formiche (Fig.…”

Section: Structural and Volcanic Settingmentioning

confidence: 99%

“…The horizontal velocity field, within the 2002-2007 time span, subdivides the Panarea volcano into two different parts, which are separated by a major NE-trending fault system revealed by bathymetric surveys (Gabbianelli et al 1990;Gamberi et al 1997;Anzidei et al 2005). We labeled "Area A" the one corresponding to the NW portion of Panarea Island and "Area B" the one corresponding to the Islets area and the SE portion of Panarea Island (Fig.…”

Section: Velocity and Strain Rate Fieldsmentioning

confidence: 99%

“…4) as composed of a largely submarine volcano extended below sea level for ∼1,100 m and of emerged islands above sea level characterized by the presence of a hydrothermal/geothermal system where volcanic gas sampled in 2002-2003 had an estimated temperature of up to 300°C and a bulk fluid pressure of about 100 bar (Chiodini et al 2006). We also considered the presence of (a) a regional NE-SW fault system as suggested by structural data (Gamberi et al 1997;De Astis et al 2003;Esposito et al 2006;Acocella et al 2008) and constrained by GPS results, and (b) two main vertical fracture systems with NNE and NW trends located west of Bottaro Islet that have been the main pathways for upwelling of hydrothermal fluids (Esposito et al 2006).…”

Section: Modeling Of Gps Datamentioning

confidence: 99%

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Modeling ground deformations of Panarea volcano hydrothermal/geothermal system (Aeolian Islands, Italy) from GPS data

et al. 2010

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Panarea volcano (Aeolian Islands, Italy) was \ud considered extinct until November 3, 2002, when a \ud submarine gas eruption began in the area of the islets of \ud Lisca Bianca, Bottaro, Lisca Nera, Dattilo, and Panarelli, \ud about 2.5 km east of Panarea Island. The gas eruption \ud decreased to a state of low degassing by July 2003. Before \ud 2002, the activity of Panarea volcano was characterized by \ud mild degassing of hydrothermal fluid. The compositions of \ud the 2002 gases and their isotopic signatures suggested that \ud the emissions originated from a hydrothermal/geothermal \ud reservoir fed by magmatic fluids. We investigate crustal \ud deformation of Panarea volcano using the global position- \ud ing system (GPS) velocity field obtained by the combina- \ud tion of continuous and episodic site observations of the \ud Panarea GPS network in the time span 1995–2007. We \ud present a combined model of Okada sources, which \ud explai ns the GPS results acquired in the area from \ud December 2002. The kinematics of Panarea volcano show \ud two distinct active crustal domains characterized by \ud different styles of horizontal deformation, supported also \ud by volcanological and structural evidence. Subsidence on \ud order of several millimeters/year is affecting the entire \ud Panarea volcano, and a shortening of 10−6 year−1 has been estimated in the Islets area. Our model reveals that the \ud degassing intensity and distribution are strongly influenced by \ud geophysical-geochemical changes within the hydrothermal/ \ud geothermal system. These variations may be triggered by \ud changes in the regional stress field as suggested by the \ud geophysical and volcanological events which occurred in \ud 2002 in the Southern Tyrrhenian area

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Section: Structural and Volcanic Settingmentioning

confidence: 99%

Section: Velocity and Strain Rate Fieldsmentioning

confidence: 99%

Section: Modeling Of Gps Datamentioning

confidence: 99%

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Modeling ground deformations of Panarea volcano hydrothermal/geothermal system (Aeolian Islands, Italy) from GPS data

et al. 2010

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“…Its activity evolved in a relatively short time range starting at 149 ± 5 ka and ended before the emplacement of several pyroclastic deposits which are dated between 42 and 13 ka [Calanchi et al, 1999]. The rhyolithic dome of Basiluzzo [Gillot, 1987] is dated 54 ± 8 ka [Calanchi et al, 1999], and its activity was connected with the northeast trending tectonic system [Gabbianelli et al, 1993;Gamberi et al, 1997] (Figure 1). …”

Section: Ecvmentioning

confidence: 99%

Modeling long‐term ground deformation due to the cooling of a magma chamber: Case of Basiluzzo island, Aeolian Islands, Italy

et al. 2003

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[1] We estimate the long-term vertical deformation of Basiluzzo island, located in the volcanic arc of the Aeolian Islands, Italy, by inferring the subsidence of a Roman age submerged wharf dated 2000 ± 50 years ago. We model the crustal deformation that produced this displacement as a cooling magma chamber emplaced during the formation of the island. This is the first attempt to model crustal deformation using the subsidence of a submerged archaeological structure. Nowadays the top of the wharf, which can be considered an unconventional leveling benchmark, is located near Punta Levante, at an average depth of 3.20 ± 0.10 m below actual sea level, and it is still in good conservation. Its present location is due to combined effect of sea level rise and volcanic and tectonic activity that occurred since it was built. Taking into account the architectural features of the wharf and that the mean sea level rise of the Mediterranean sea has been estimated as $0.45 m during the last 2000 years [Flemming and Webb, 1986], we estimate a total subsidence of 3.75 ± 0.10 m, at a rate of about 1.87 mm yr À1 [Anzidei et al., 2002]. We propose a possible mechanism for the long-term subsidence, which occurred on a timescale of thousands of years, by considering the Earth's crust as a Maxwell body. We assume that the magmatic source is located directly beneath Basiluzzo dome and underwent progressive solidification and subsequent volume reduction since its emplacement 50,000 years ago.INDEX TERMS: 8429 Volcanology: Lava rheology and morphology; 8439 Volcanology: Physics and chemistry of magma bodies; 8499 Volcanology: General or miscellaneous; KEYWORDS: volcanism, magma chamber, archaeology Citation: Tallarico, A., M. Dragoni, M. Anzidei, and A. Esposito, Modeling long-term ground deformation due to the cooling of a magma chamber: Case of

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“…Both the Panarea Island and the submerged flat surface are affected by NE-SW to NNE-SSW striking faults along which Fe-mineralizations and sulfide deposits occur (Figs. 1b,c) (GABBIANELLI et al, 1990;GAMBERI et al, 1997). The strike of these faults is the same of the faults affecting the Island of Stromboli and the Stromboli Canyon, a NE-SW striking submarine valley located south of Panarea ( Fig.…”

Section: Introductionmentioning

confidence: 96%

Geochemistry of the Submarine Gaseous Emissions of Panarea (Aeolian Islands, Southern Italy): Magmatic vs. Hydrothermal Origin and Implications for Volcanic Surveillance

Chiodini

Caliro

Caramanna

et al. 2006

Pure appl. geophys.

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The marine sector surrounding Panarea Island (Aeolian Islands, South Italy) is affected by widespread submarine emissions of CO 2 -rich gases and thermal water discharges which have been known since the Roman Age. On November 3 rd , 2002 an anomalous degassing event affected the area, probably in response to a submarine explosion. The concentrations of minor reactive gases (CO, CH 4 and H 2 ) of samples collected in November and December, 2002 show drastic compositional changes when compared to previous samples collected from the same area in the 1980s. In particular the samples collected after the November 3 rd phenomenon display relative increases in H 2 and CO and a strong decrease in the CH 4 contents, while other gas species show no significant change. The interaction of the original gas with seawater explains the variable contents of CO 2 , H 2 S, N 2 , Ar and He which characterize the different samples, but cannot explain the large variations of CO, CH 4 and H 2 which are instead compatible with changes in the redox, temperature and pressure conditions of the system. Two models, both implying an increasing input of magmatic fluids are compatible with the observed variations of minor reactive species. In the first one, the input of magmatic fluids drives the hydrothermal system towards atypical (more oxidizing) redox conditions, slowly pressurizing the system up to a critical state. In the second one, the hydrothermal system is flashed by the rising high-T volcanic fluid, suddenly released by a magmatic body at depth. The two models have different implications for volcanic surveillance and risk assessment: In the first case, the November 3 rd event may represent both the culmination of a relatively slow process which caused the overpressurization of the hydrothermal system and the beginning of a new phase of quiescence. The possible evolution of the second model is unforeseeable because it is mainly related to the thermal, baric and compositional state of the deep magmatic system that is poorly known.

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Tectonic, volcanic and hydrothermal features of a submarine portion of the Aeolian arc (Tyrrhenian Sea)

Cited by 68 publications

References 31 publications

Modeling ground deformations of Panarea volcano hydrothermal/geothermal system (Aeolian Islands, Italy) from GPS data

Modeling ground deformations of Panarea volcano hydrothermal/geothermal system (Aeolian Islands, Italy) from GPS data

Modeling long‐term ground deformation due to the cooling of a magma chamber: Case of Basiluzzo island, Aeolian Islands, Italy

Geochemistry of the Submarine Gaseous Emissions of Panarea (Aeolian Islands, Southern Italy): Magmatic vs. Hydrothermal Origin and Implications for Volcanic Surveillance

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