Abstract
<p>This paper is a contribution to the evaluation of ground deformations at Somma-Vesuvius volcano by means GPS measurements from 2001 to 2012. In this study we use a dataset from nine continuous GPS stations of the Neapolitan Volcanoes Continuous GPS network (NeVoCGPS), which covers the Neapolitan volcanic area, and is operated by the Istituto Nazionale di Geofisica e Vulcanologia. The GPS data processing is performed by the Bernese software v. 5.0. The results of the data processing show that the dynamics of the Somma-Vesuvio volcano, between 2001 and 2012, is characterized by a general subsidence, with maximum values on the Gran Cono at BKNO (−11.7 ± 0.65 mm/year) and BKE1 (−4.92 ± 0.36 mm/year) stations. The subsidence decrease from the crater down to the coast and the horizontal displacements are concentrated in Gran Cono area, the youngest part of the volcano. The parameters of the principal strain components indicate that Somma-Vesuvius is affected by a predominant contraction phase, which is concentrated in the areas with the greatest altitudes.</p>
Highlights
The Somma-Vesuvius is a strato-volcano located km east of Naples (Figure 1)
Project has shown the following evidences: a) a highvelocity zone which extends vertically from about 400 m below the crater down to at least 3000 m and a shallow 300-500 m thick low-velocity layer which covers the edifice [Zollo et al 1996a, 1996b]; b) a detailed image of the top of Mesozoic carbonate rocks forming the basement of the volcanic area. [Zollo et al 2002]; c) an extended low-velocity layer at about 8-kilometer depth, interpreted as a sill with magma interspersed in a solid matrix [Auger et al 2001, Capuano et al 2003]
From a ground deformation viewpoint, we show that the dynamics of volcano is characterized by diffuse subsidence and by planimetric movements concentrated only in the high elevation zone of Somma-Vesuvius
Summary
The Somma-Vesuvius is a strato-volcano located km east of Naples (Figure 1). It is about 1,200 meters high and covers a surface area of 165 km2 [Principe et al 1987]. From a ground deformation viewpoint, we show that the dynamics of volcano is characterized by diffuse subsidence and by planimetric movements concentrated only in the high elevation zone of Somma-Vesuvius. To eliminate the global tectonic motion and highlight the volcanic deformation, the planimetric velocities of GPS permanent stations are calculated with respect to a local reference station (ENAV; Figure 1) located on the limestones of Sorrento Peninsula, outside the volcanic area, and with long time span of measurements and constant horizontal velocities.
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