Viedma has erupted during the Holocene; a tephra found in Lago Cardiel and dated 3,345 - 3,010 years before present may have originated at Viedma, although Aguilera and Lautaro are also candidate source volcanoes. Due to the absence of traces of volcanism at Viedma Nunatak the Global Volcanism Program removed its entry for Viedma in 2019.