Abstract
<p>New velocity and attenuation images of the geological structures below Mt. Vesuvius have been obtained using the programming facilities as well as the enhanced graphical power of Mathematica<span><sup>8TM</sup></span>. The velocity and attenuation space distributions, already calculated inverting respectively P-wave travel times and amplitude spectra of local VT quakes, are first optimally interpolated and then graphically represented in a new Mathematica<span><sup>8TM</sup></span> code notebook (a powerful computational document with more facilities than a simple code) developed by the present authors. The notebook aims at interactively and friendly representing 3D volume distributions of velocity and attenuation parameters. The user can easily obtain vertical sections (N-S, E-W, NE-SW and NW-SE oriented) and define color scales to represent velocity or attenuation variations or prefer iso-surface plots to represent the pattern of peculiar geological structures. The use of dynamic graphical representation, allowing the sliding of any (horizontal and/or vertical) slice through the volume under study, gives an unusual and powerful vision of any small velocity or attenuation anomaly. The (open source) code, coupled with the friendly use of internal routines of Mathematica, allows to adapt the graphical representation to any user necessity. The method appears to be particularly adapt to represent attenuation images, where the space variations of the parameters are strong with respect to their average. The 3-D plots of the interpolated velocity and attenuation fields enhance the image of Mt. Vesuvius structure, evidencing low-velocity associated with high attenuation anomalies which appeared unfocused in the plots reported by Scarpa et al. [2002] and De Siena et al. [2009].</p>
Highlights
The interpretation of seismic tomography images is based on the visual association of earth volumes marked by a peculiar space distributions of velocity, attenuation or scattering with a characteristic compatible rock lithology
Our main goal is to facilitate the revision of the geological interpretation based on the joint tomography results described in the two papers above; we developed a new Mathematica8TM notebook, i.e. a powerful computational documents with more facilities than a simple code, aimed at an easy and personalized visualization of the 3D velocity and attenuation patterns
In the present note we will describe the structure of SeeVes and we will show an application producing new tomography images of Mt
Summary
1. Introduction The interpretation of seismic tomography images is based on the visual association of earth volumes marked by a peculiar space distributions of velocity, attenuation or scattering with a characteristic compatible rock lithology. In the case of Mt. Vesuvius, a correct interpretation of the results from seismic tomography (in attenuation and velocity) may be crucially influenced by the visual representation of the results, being the geological structure of this volcano highly heterogeneous, with drastic lateral or vertical changes of lithology in small distance ranges [Scarpa et al 2002, De Siena et al 2009].
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