BackgroundThe Sabatini Volcanic Complex has no clearly delineated volcanic structure, but is a distribution of volcanic vents (Conticelli et al., 1997). The Sacrofano center in the eastern part of the complex and the Bacciano center in the west were active from 0.5 to 0.09 Ma (De Rita et al., 1983). Other smaller volcanic systems are Morlupo, Vigna di Valle, Trevignano, and Baccano (Conticelli et al., 1997). The Sacrofano and Bacciano centers dominate the five phases of the complex's eruptive history. The first two phases involved intense explosive activity at Sacrofano and Molupa (0.6-0.4 Ma), resulting in tuffs, ashes, and pyroclastic flows during the pre-Sacrofano Caldera stage. During the third phase, hydromagmatic eruptions formed the Sacrofano Caldera and minor lava flows occurred in the post-caldera stage. In the western sector, a stratovolcano and the Bracciano Caldera developed, along with fissure eruptions that produced flood lavas greater than 100 km3, air-fall tuffs, and surge deposits. Activity at small eruptive vents on the rims of the collapsed Bracciano and Sacrofano Calderas dominated the fourth phase, resulting in pyroclastics at Bracciano and parasitic cinder cones and lava flows at Sacrofano. Hyrdomagmatic activity localized between the two calderas, which produced tuff rings, cones, and maars, dominated the final phase (Conticelli et al., 1997).
Smithsonian / GVP volcano information
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