High precision tilt observation at Mt. Etna Volcano, Italy

Ferro, Angelo; Gambino, Salvatore; Panepinto, Stefano; Falzone, Giuseppe; Laudani, Giuseppe; Ducarme, B.

doi:10.2478/s11600-011-0003-7

Cited by 31 publications

(28 citation statements)

References 32 publications

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“…As mentioned before, the constant 0.6 g/cm 3 is not realistic in many parts of the Earth, especially in ocean areas (Sjöberg and Bagherbandi, 2011). This fact implies that the estimated Moho depths for constant density contrast have large differences in comparison with CRUST2.0 model.…”

Section: R E G I O N a L C O M P A R I S O N O F M O H O D E P T H M mentioning

confidence: 95%

“…As mentioned before, using a realistic density contrast can improve the estimated Moho depth by the VMM model. This idea originates from Sjöberg and Bagherbandi (2011), where we used different density contrasts for land and ocean areas (0.5 g/cm 3 and 0.35 g/cm 3 , respectively). The result agrees better with the seismic CRUST2.0 model.…”

Section: Numerical Studiesmentioning

confidence: 99%

“…Therefore, we select different density contrasts in continental and oceanic areas. These values can be estimated from the density contrast model presented by Sjöberg and Bagherbandi (2011). For example, Figs.…”

Section: R E G I O N a L C O M P A R I S O N O F M O H O D E P T H M mentioning

confidence: 99%

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Comparison of crustal thickness from two gravimetric-isostatic models and CRUST2.0

Bagherbandi

Sjöberg

2011

Stud Geophys Geod

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The Mohorovičić discontinuity is the boundary between the Earth's crust and mantle. Several isostatic hypotheses exist for estimating the crustal thickness and density variation of the Earth's crust from gravity anomalies. The goal of this article is to compare the Airy-Heiskanen and Vening Meinesz-Moritz (VMM) gravimetric models for determining Moho depth, with the seismic Moho (CRUST2.0 or SM) model. Numerical comparisons are performed globally as well as for some geophysically interesting areas, such as Fennoscandia, Persia, Tibet, Canada and Chile. These areas are most complicated areas in view of rough topography (Tibet, Persia and Peru and Chile), post-glacial rebound (Fennoscandia and Canada) and tectonic activities (Persia). The mean Moho depth provided by CRUST2.0 is 22.9  0.1 km. Using a constant Moho density contrast of 0.6 g/cm 3 , the corresponding mean values for Airy-Heiskanen and VVM isostatic models become 25.0  0.04 km and 21.6  0.08 km, respectively. By assuming density contrasts of 0.5 g/cm 2 and 0.35 g/cm 3 for continental and oceanic regions, respectively, the VMM model yields the mean Moho depth 22.6  0.1 km. For this model the global rms difference to CRUST2.0 is 7.2 km, while the corresponding difference between Airy-Heiskanen model and CRUST2.0 is 11 km. Also for regional studies, Moho depths were estimated by selecting different density contrasts. Therefore, one conclusion from the study is that the global compensation by the VMM method significantly improves the agreement with the CRUST2.0 vs. the local compensation model of Airy-Heiskanen. Also, the last model cannot be correct in regions with ocean depth larger than 9 km (e.g., outside Chile), as it may yield negative Moho depths. This problem does not occur with the VMM model. A second conclusion is that a realistic variation of density contrast between continental and oceanic areas yields a better fit of the VMM model to CRUST2.0. The study suggests that the VMM model can primarily be used to densify the CRUST2.0 Moho model in many regions based on separate data by taking advantage of dense gravity data. Finally we have found also that the gravimetric terrain correction affects the determination of the Moho depth by less than 2 km in mean values for test regions, approximately. Hence, for most practical applications of the VMM model the simple Bouguer gravity anomaly is sufficient. M. Bagherbandi and L.E. Sjöberg 642 Stud. Geophys. Geod., 55 (2011) K e y wo r d s : crustal thickness, CRUST2.0 model, inverse isostatic problem, isostatic compensation, Moho depth

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Section: R E G I O N a L C O M P A R I S O N O F M O H O D E P T H M mentioning

confidence: 95%

Section: Numerical Studiesmentioning

confidence: 99%

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Comparison of crustal thickness from two gravimetric-isostatic models and CRUST2.0

Bagherbandi

Sjöberg

2011

Stud Geophys Geod

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“…In recent years the network has been improved with deep stations using advanced high resolution (<5 nanoradians) self-levelling instruments [33].…”

Section: Tilt Networkmentioning

confidence: 99%

Tilt offset associated with local seismicity: the Mt. Etna January 9, 2001 seismic swarm.

Gambino

2016

Open Geosciences

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On the 9 th of January 2001 a seismic swarm on the southeastern flank of Mt. Etna at 3.5 km beside sea level (b.s.l.), caused co-seismic variations on short and long baseline tiltmeters of the Mt. Etna permanent tilt network. Taking account of the geometry and mechanism of the active tectonic structure obtained by seismological studies, the theoretical tilt linked to the faulting source was calculated at multiple different recording stations. It was found that the amount of measured deformation exceeded that which was generated seismically, indicating that much of the deformation along the fault was aseismic. The 9 January 2001 episode represents a shear response to a local stress caused by a volcanic source that acted in the period preceding the 2001 eruption. Tilt data also suggest a marked slip of 70-140 cm along the fault, probably due to the presence of fluids.

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“…Shallow borehole tiltmeters are used to monitor the ground deformation of volcanoes throughout the world since they are able to measure precise tilt variations (Dzurisin 1992(Dzurisin , 2003Ferro et al 2011). These changes range from slow (monthsÁyears) to fast (minutesÁdays), highlighting different processes occurring at volcanoes (Gambino et al 2014).…”

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confidence: 99%

Tilt signals at Mount Melbourne, Antarctica: evidence of a shallow volcanic source

et al. 2016

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High precision tilt observation at Mt. Etna Volcano, Italy

Cited by 31 publications

References 32 publications

Comparison of crustal thickness from two gravimetric-isostatic models and CRUST2.0

Comparison of crustal thickness from two gravimetric-isostatic models and CRUST2.0

Tilt offset associated with local seismicity: the Mt. Etna January 9, 2001 seismic swarm.

Tilt signals at Mount Melbourne, Antarctica: evidence of a shallow volcanic source

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