"Tromen is a 3978-m-high Argentinian stratovolcano that lies at the northern end of an elongated volcanic massif. The summit of Tromen is cut by two overlapping 3.5-km-wide calderas. The Pleistocene Volcán Cerro Negro del Tromen, with a 5-km-wide caldera, lies immediately north of Tromen, and lava flows from Tromen have partially overtopped the northern caldera rim. At the SSW end of this N-S-trending chain is Cerro Tilhue, of Pleistocene-Holocene age. Post-caldera vents at Tromen were constructed inside both calderas and on the flanks of the NE-most caldera. The youngest lava flows at Tromen originated from flank vents and descended the north and NE sides of the andesitic-to-rhyolitic volcanic complex. Holocene vents are also located in the Cerro Michico area on the lower NE flank. Historical eruptions of Tromen were reported in the mid-18th century and in 1822. Von Wolff (1929) attributed purported eruptions of Pomahuida in 1820, 1823, 1827, 1828 as being from Tromen, but these are not confirmed."  -Smithsonian Volcano Archive
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