Seismic hazard assessment at Mt. Vesuvius: Maximum expected magnitude

Cubellis, E.; Luongo, G.; Marturano, A.

doi:10.1016/j.jvolgeores.2007.03.003

Cited by 24 publications

(12 citation statements)

References 37 publications

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“…The volcanic activity in the area dates back to about 400,000 years ago [Brocchini et al 2001, Cubellis et al 2007], although Mt. Vesuvius volcano was formed about 25,000 years ago, about 8000 years before the collapse of the Somma caldera [Delibrias et al 1979].…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal distribution of vertical ground movements at Mt. Vesuvius in the period 1973-2009

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Bottiglieri²,

Godano³

et al. 2013

Annals of Geophysics

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<p>Since the early ’70s vertical ground movements at Mount Vesuvius area have been investigated and monitored by the Osservatorio Vesuviano (Isti-tuto Nazionale di Geofisica Vulcanologia - Osservatorio Vesuviano since 2001). This monitoring began with the installation of a high-precision leveling line in the region at medium-high elevations on the volcano. The deformation pattern and expected strain field assessment methods in the volcanic structure induced by inner sources has demanded in subsequent years the expansion of the leveling network up to cover the whole volcanic area, enclosing part of leveling lines of other institutions. As a result of this expansion, the Mt. Vesuvius Area Leveling Network (VALN) has today reached a length of about 270 km and consists of 359 benchmarks. It is configured in 21 circuits and is connected, westward, to the Campi Flegrei leveling network and, northward, to the Campania Plain leveling network. The data collected have been carefully re-analyzed for random and systematic errors and for error propagation along the leveling lines to identify the areas affected by significant ground movements. For each survey, the data were rigorously adjusted and vertical ground movements were evaluated by differentiating the heights calculated by the various measurements conducted by the Osservatorio Vesuviano from 1973 to 2009.</p>

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal distribution of vertical ground movements at Mt. Vesuvius in the period 1973-2009

Pingue

Bottiglieri²,

Godano³

et al. 2013

Annals of Geophysics

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“…U. Tammaro et al: Somma-Vesuvius volcano, topography and structural heterogeneities Pezzo et al, 2004;De Natale et al, 2004;Galluzzo et al, 2004;Cubellis et al, 2007).…”

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confidence: 99%

Topography and structural heterogeneities in surface ground deformation: a simulation test for Somma-Vesuvius volcano

et al. 2021

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Abstract. We simulate the deformation of Somma-Vesuvius volcano due to some overpressure sources by means of a finite element 3D code. The main goal of these simulations is to investigate the influence of topography and structural heterogeneity on ground deformation. In our model the sources of deformation are embedded in an elastic linear isotropic medium and located at various depths. Geometry (shape and lateral extension) of the sources is mainly constrained by the results coming from recent seismic tomography studies. The structural heterogeneity has been modelled in terms of dynamic elastic parameters (Young's modulus) retrieved from previous seismic tomography and gravity studies. A high-resolution digital terrain model is used for the topography of the volcano subaerial edifice. Evidences from our results suggest that real topography and structural heterogeneities are key factors governing the ground deformation, which often turns being one of the most relevant problems in volcano monitoring. A large deviation from the axially symmetrical model of the displacement field is the main result of our modelling. Such an asymmetry is routinely unaccounted for when Mogi's simplistic modelling in a homogeneous medium with simplified topography is used. Our study clearly demonstrate that a better knowledge of deformation patterns can significantly help in the location of monitoring sensors as well as in the design of an efficient geodetic network.

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“…This may be associated to various factors such as the anomalous thermal state of the crust, the high fracturing of the medium, the reduction in potential seismogenetic volume and the action of concentrated local stress (Abe 1979;Yokoyama 2001;Cubellis and Marturano 2002;Zobin 2003;McNutt 2005;Azzaro et al 2006;Cubellis et al 2004Cubellis et al , 2007. At the same time, significant volcanic earthquakes of moderate magnitude may occur and produce serious damage.…”

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confidence: 99%

The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions

2009

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This article presents the results of a detailed study of the effects of the 1883 earthquake, which occurred at the island of Ischia (Gulf of Naples) and produced the total destruction of buildings in the epicentral area (Casamicciola town). Despite the moderate magnitude, this event was characterised by very high intensities (I max = XI degree MCS) mainly due to the shallow depth of the source. The study of the earthquake shows that the intensities, which decreased rapidly with distance, were affected by source directivity, according to the causative fault geometry and tectonic structures, while local amplification of damage was observed where soft soils outcrop. The attenuation of seismic intensity with distance was evaluated using the well-known relation of intensity versus epicentral distance (Blake's method). The diverse gradients of attenuation, observed in different directions, were ascribed to the various geological features of the shallow crust of the island. In order to evaluate the role of geology in the damage level, we computed different attenuation models for stiff and soft soils outcropping on the island. A systematic local amplification of about 1 MCS degree associated to the presence of reworked tuffs was obtained. This study also shows the influence of geological conditions on the evaluation of macroseismic data and supplies useful elements to derive a predictive map of potential site effects.

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Seismic hazard assessment at Mt. Vesuvius: Maximum expected magnitude

Cited by 24 publications

References 37 publications

Spatial and temporal distribution of vertical ground movements at Mt. Vesuvius in the period 1973-2009

Spatial and temporal distribution of vertical ground movements at Mt. Vesuvius in the period 1973-2009

Topography and structural heterogeneities in surface ground deformation: a simulation test for Somma-Vesuvius volcano

The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions

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