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Viedma volcanoViedma is a volcano underneath the Patagonian Icefield NW of Viedma Lake in southern Argentinia. Its existence was confirmed during the eruption in 1988. ONly parts of the volcano rise above the glaciers.
Background:from Smithsonian / GVP volcano information:
The Volcán Viedma eruptive center is a subglacial dacitic volcano beneath the Patagonian Icecap west of the spectacular granitic spires of the Cerro Torre, Cerro Fitz Roy area.
Only part of the older edifice rises above the surface of the icecap. 4 large craters or calderas between 1.5 and 4 km in diameter are located along a N-S line.
The 1988 eruption generated deposits of ash and pumice on the Patagonian
glacier and produced a mud-flow that reached the Viedma Lake