Activity at Socompa commenced with the extrusion of andesites, which were followed later by dacites. Several Plinian eruptions have occurred on Socompa. Several dates have been obtained on Socompa rocks, including 2,000,000 ± 1,000,000, 1,300,000 ± 500,000, 800,000 ± 300,000 and less than 500,000 years ago. After the sector collapse 7,200 years ago, activity continued filling the collapse scar. The explosion craters on the summit are the youngest volcanic landforms on Socompa, there are no dates available for the lava domes and flows within the collapse scar. The youngest eruption was dated to have occurred 5,250 years before present.