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by means of geomagnetic data. This work is shown not only as a real test to check the validity of the inversion
algorithm, but also to add information about the structure of the volcanic complex. First, we outline briefly the
theory of geomagnetic data inversion and we introduce the approach adopted. Then we show the 3D model of the
Amiata volcano built from the inversion, and we compare it with the available geological information. The most
important consideration regards the surface distribution of the magnetization that is in good agreement with rock
samples from this area. Moreover, the recovered model orientation recall the extension of the lava flows, and as a
last proof of validity, the source appears to be contained inside of the topographic contour level. The credibility of
the inversion procedure drives the interpretation even for the deepest part of the volcano. The geomagnetic signal
appears suppressed at a depth of about 2 km, but the most striking consequence is that sub-vertical structures are
found even in different positions from the conduits shown in the geologic sections. The results are thus in good
agreement with the information obtained from other data, but showing features that had not been identified, stressing
the informative power of the geomagnetic signal when a meaningful inversion algorithm is used.
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