BackgroundThe trachydacitic domes and associated lava flows, which were emplaced following the eruptions of rhyodacitic ignimbrites during the Pliocene, were erupted along regional ENE-WSW-trending faults. The largest of the domes is 1738-m-high Monte Amiata (La Vetta), a compound lava dome with a trachytic lava flow that extends to the east. A massive viscous trachydacitic lava flow, 5 km long and 4 km wide, is part of the basal complex and extends from beneath the southern base of Corno de Bellaria dome. Radiometric dates indicate that the Amiata complex formed during two major eruptive episodes about 300,000 and 200,000 years ago and that ages of the domes and lava flows decrease from the WSW to ENE. No eruptive activity has occurred at Amiata during the Holocene, but thermal activity continues at a producing geothermal field near the town of Bagnore, at the SW end of the dome complex.
Saturnia, Sulfur Springs near volcano Monte Amiata, Toskana, Italy (Photo: WNomad)
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