Rilevamento geomagnetico degli apparati vulcanici Vicano e Sabazio

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

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