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Panarea
"The mostly submerged Panarea volcanic complex lies about halfway between Stromboli and Lipari in the eastern part of the Aeolian Islands. The 421-m-high island of Panarea, the smallest in the Aeolian Archipelago, lies on the western side of a shallow platform whose shelf margin is at about 130 m depth. A series of small islands breach the surface to form the Central Reefs, the rim of a crater 2 km east of Panarea whose shallow submerged floor contains Roman ruins. The submerged Secca dei Pesci lava dome lies at the SE end of the platform, and the rhyolitic Basiluzzo lava dome rises 165 m above the surface at the NE end, along a ridge trending towards Stromboli volcano. The Panarea complex was constructed in two main stages; initial effusive activity that produced lava domes, and an explosive stage. The youngest subaerial airfall-tephra deposits of the Panarea complex are dated at about 20,000 years ago; a <10,000 BP date on a lava flow is uncertain. Vigorous hydrothermal activity has continued at fumarolic fields at several locations on the submerged platform, and submarine hydrothermal explosions have occurred in historical time."  -Smithsonian Volcano Archive
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