Volcanic structure of the southern sector of Mt. Etna after the 2001 and 2002 eruptions defined by magnetotelluric measurements

Manzella, Adele; Zaja, A.

doi:10.1007/s00445-006-0054-9

Cited by 8 publications

(6 citation statements)

References 29 publications

(52 reference statements)

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“…The lack of MT data in the VdB prevents us from assessing whether a possible extension of this structure corresponds to the eastern margin of the S Rift, but we note that the dike is located above the high-velocity, high-density body that we mentioned previously (see section 1). This feature is reinforced by previous MT investigations [Mauriello et al, 2000;Manzella and Zaja, 2006], which have noted relatively high resistivity values in profiles crossing this zone.…”

Section: Interpretation Of the Mt Profilessupporting

confidence: 78%

“…Subsurface structural images of Etna have been derived from the arrival times of compressional waves [ De Luca et al , 1997; Villaseñor et al , 1998; Laigle et al , 2000; Aloisi et al , 2002; Chiarabba et al , 2004; Patanè et al , 2002, 2006], from the attenuation of seismic waves [ De Gori et al , 2005; Martínez‐Arévalo et al , 2005], and from gravity data [ Schiavone and Loddo , 2007]. To date, only two magnetotelluric (MT) surveys of the area have been published [ Mauriello et al , 2000; Manzella and Zaja , 2006]. …”

Section: Introductionmentioning

confidence: 99%

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Flank instability structure of Mt. Etna inferred by a magnetotelluric survey

et al. 2012

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[1] This paper presents a magnetotelluric (MT) survey of the unstable eastern flank of Mt. Etna. We take thirty soundings along two profiles oriented in the N-S and NW-SE directions, and from these data recover two 2D resistivity models of the subsurface. Both models reveal three major layers in a resistive-conductive-resistive sequence, the deepest extending to 14 km bsl. The shallow layer corresponds to the volcanic cover, and the intermediate conductive layer corresponds to underlying sediments segmented by faults. These two electrical units are cut by E-W-striking faults. The third layer (basement) is interpreted as mainly pertinent to the Apennine-Maghrebian Chain associated with SW-NE-striking regional faults. The detailed shapes of the resistivity profiles clearly show that the NE Rift is shallow-rooted (0-1 km bsl), thus presumably fed by lateral dikes from the central volcano conduit. The NW-SE profile suggests by a series of listric faults reaching up to 3 km bsl, then becoming almost horizontal. Toward the SE, the resistive basement dramatically dips (from 3 km to 10 km bsl), in correspondence with the Timpe Fault System. Several high-conductivity zones close to the main faults suggest the presence of hydrothermal activity and fluid circulation that could enhance flank instability. Our results provide new findings about the geometry of the unstable Etna flank and its relation to faults and subsurface structures.

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Section: Interpretation Of the Mt Profilessupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Flank instability structure of Mt. Etna inferred by a magnetotelluric survey

et al. 2012

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“…Magnetotelluric surveys have been used to image volcanic edifices and processes inside them, such as in New Zealand [e.g., Ogawa et al, 1999;Heise et al, 2008;Ingham et al, 2009], North America [e.g., Wannamaker et al, 1991;Hill et al, 2009], Japan [e.g., Ogawa et al, 2001;Nurhasan et al, 2006;Aizawa et al, 2014], Iceland [e.g., Oskooi et al, 2005;Árnason et al, 2010;Spichak et al, 2013], and Italy [e.g., Di Maio et al, 1997;Volpi et al, 2003;Manzella and Zaja, 2006;Siniscalchi et al, 2012].…”

Section: Magnetotelluric Surveysmentioning

confidence: 99%

Vertical collapse origin of Las Cañadas caldera (Tenerife, Canary Islands) revealed by 3‐D magnetotelluric inversion

Piña-Varas

Ledo

Queralt

et al. 2015

Geophysical Research Letters

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Tenerife island geology is one of the most complexes of the Canaries archipelago. This complexity is evidenced by the existing controversy regarding the lateral or vertical collapse origin of the Las Cañadas caldera. The resistivity structure of the Las Cañadas caldera has been determined by the 3-D inversion of 188 broadband magnetotelluric data. The resistivity distribution obtained in the final model shows clear evidences of the presence of a vertical structure under the Teide, associated to the buried northern wall of the caldera. Additionally, the characteristics of the main resistivity structure, a ring-shaped low-resistivity body (<10 Ω m) interpreted as a hydrothermal clay alteration cap, would point out the presence of a handwall for the Icod Valley lateral landslide located under the Teide, but not in the southern caldera wall (current wall). All these support the vertical collapse hypothesis to explain the origin of the Las Cañadas caldera.

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“…Magnetotelluric data give valuable information regarding the presence of fluids, partial melt or conducting anomalies at shallow levels of the crust and deeper levels of the crust and upper mantle, and also provide first order structure and physico‐chemical state (temperature, fluids, melts) of the subsurface. The MT and AMT methods have been used successfully to study various volcanoes, such as the Hawaiian archipelago [ Bartel and Jacobson , 1987], the island of Tenerife (Canary Islands) by Pous et al [2002] and Coppo et al [2008], to monitor active volcanoes [e.g., Manzella and Zaja , 2006; Ogawa et al , 1998; Matsushima et al , 2001; Aizawa et al , 2009], and also in the Aleutians as part of a environmental and hydrological study [ Unsworth et al , 2007].…”

Section: Amt Experiments On the Island Of La Palmamentioning

confidence: 99%

Internal structure of the western flank of the Cumbre Vieja volcano, La Palma, Canary Islands, from land magnetotelluric imaging

García¹,

Jones²

2010

J. Geophys. Res.

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Large‐scale mass wasting is a natural part of the evolution of volcanic islands, where deformation and indications of flank instability, such as large‐scale faulting and seismic and aseismic slip are common. The Cumbre Vieja volcano on the island of La Palma (Canary Islands) provides an ideal setting to address fundamental questions about the structure, evolution and stability of island volcanoes. The island of La Palma is still in a shield‐building stage, and it has been postulated that the western side of the island lies over a pre‐existing zone of weakness that can nucleate ruptures. We undertook an audiomagnetotelluric (AMT) survey over the proposed unstable western flank to try to image structures that may be associated with the zone of weakness. The magnetotelluric method (MT) is a geophysical technique used to map the presence of fluids or image important structural contrasts. The goals of this study were (1) to delineate the unstable flank, (2) to map the structures underneath and (3) to determine the presence and geometry of fluids. The results show a 1 km thick top resistive layer overlaying an area of reduced resistivity (enhanced conductivity), interpreted as a layer consisting of an alteration zone and also fluids. Our results confirm previous studies that suggested the existence of a western flank lying over collapse debris material and hyaloclastites, and also they allow us to map part of the subaerial southern extent of the Cumbre Nueva units that lie beneath the more recent Cumbre Vieja rocks. In addition, dimensionality analysis maps the rotation of the dike emplacement off ridge, along the western flank in an en echelon fashion.

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Volcanic structure of the southern sector of Mt. Etna after the 2001 and 2002 eruptions defined by magnetotelluric measurements

Cited by 8 publications

References 29 publications

Flank instability structure of Mt. Etna inferred by a magnetotelluric survey

Flank instability structure of Mt. Etna inferred by a magnetotelluric survey

Vertical collapse origin of Las Cañadas caldera (Tenerife, Canary Islands) revealed by 3‐D magnetotelluric inversion

Internal structure of the western flank of the Cumbre Vieja volcano, La Palma, Canary Islands, from land magnetotelluric imaging

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