Advanced magnetic visualization of Mt. Vesuvius shallow plumbing system by probability tomography

P Mauriello P Mauriello,T Iuliano T Iuliano,D Patella D Patella

doi:10.4401/ag-3505

Abstract

We show the results of the application of a new magnetic probability tomography imaging method to the aeromagnetic dataset collected by AGIP on Mt. Vesuvius in 1978. A magnetic dipole occurrence probability function is defined in such a way as to contain all information about the whole class of equivalent sources compatible with the original survey dataset. An advanced 3D visual system is also applied for the first time to visualise the spacial pattern of the magnetic dipole occurrence probability function. It is shown that in the case of Vesuvius, the shallow plumbing system is characterised by a high probability of occurrence of a dipole at 2 km of depth b.s.l., nearly directed along the present main earths magnetic field. This leads to hypothesize that the top terminal portion of the volcanic apparatus is completely filled with magnetised volcanic material.

Highlights

Probability tomography was first introduced to image self-potential anomaly sources (Patella, 1997a,b) and extended to analyse geoelectrical (Mauriello et al, 1998; Mauriello and Patella, 1999a), natural electromagnetic induction (Mauriello and Patella, 1999b, 2000), gravity (Mauriello and Patella, 2001a,b) and magnetic data (Mauriello and Patella, 2001c)
Probability tomography has been already applied to the analysis of self-potential, geoelectrical, gravity and magnetic data sets collected in the volcanic area of Mt
Using the principles of the probability tomography (Patella, 1997a,b), at first the total power Ru, associated with the component Bu(r) of B(r) along a generic direction identified by the unit vector u, is defined as

Summary

Introduction

Probability tomography has been already applied to the analysis of self-potential, geoelectrical, gravity and magnetic data sets collected in the volcanic area of Mt. Vesuvius (Naples, Italy) (Di Maio et al, 1998; Patella and Mauriello, 1999; Iuliano et al, 2001). The purpose of this paper is to repropose the to-mographic imaging of the magnetic sources beneath Mt. Vesuvius, using a new formulation of the magnetic probability tomography theory (Mauriello and Patella, 2001c) coupled with a 3D object-oriented Advanced Visual System (AVS). The new magnetic probability tomography imaging method and the most important aspects of a 3D AVS visual development tool are described.

The 3D magnetic occurrence probability function

Findings

Advanced data visualization