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the earth's field has been made in the region of lakes Vico and Bracciano,
i. e., in the areas interested by the Vican and Sabatian volcanic structures,
in view of a more detailed study of the magmatic masses that have alimented
Interpretations of the results have led to following conclusion: a) a
discontinuity exists between tlie magmatic mass that has alimented the Vican and Sabatian volcanism and the magmatic masses responsible for the volcanism
in the area of lake Bolsena and of the Colli Albani; b) this magmatic
mass may be assimilated to a rougly ellipsoidal body with the central point
at approximately 7 to 10 km depth and the upper level very near to surface,
and with lateral dimensions of the order of about 12-15 km, presenting
upward protuberances that correspond to the crater of the Vico lake and
to the area on the northwest of the Bracciano lake basin; c) there exist
a lateral apophysis, connected with the main mass, which interests the craters
of I'olline, Martignano, Baccano, and Sacrofano; it consists of a kind of
plate of minor thickness, extending eastward at a depth of about 1-2 km,
and roughly 5 km large.
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