Inner structure of the Puy de D?me volcano: cross-comparison of geophysical models (ERT, gravimetry, muon imaging)

摘要

Muon imaging of volcanoes and of geological structures in general isactively being developed by several groups in the world. It has the potential toprovide 3-D density distributions with an accuracy of a few percent. At thisstage of development, comparisons with established geophysical methods areuseful to validate the method. An experiment has been carried out in 2011and 2012 on a large trachytic dome, the Puy de D?me volcano, to performsuch a comparison of muon imaging with gravimetric tomography and 2-Delectrical resistivity tomography. Here, we present the preliminary resultsfor the last two methods.North–south and east–west resistivity profiles allow us to model theresistivity distribution down to the base of the dome. The modelling of theBouguer anomaly provides models for the density distribution within the domethat are directly comparable with the results from the muon imaging. Ourultimate goal is to derive a model of the dome using the jointinterpretation of all sets of data.