The volcano supposedly "collapsed" in the 1877 Iquique earthquake, according to secondhand information in a 1903 report on earthquakes in Chile. Single reports of activity in 1830, 1930, 1937, 1939 and 1950 exist, but the volcano is considered to have no historic eruptions, with fumaroles and seismicity the only ongoing activity. Renewed activity is likely to mostly affect the southern, eastern and western slopes of the volcano. In particular the town of Tacora would be threatened, while pyroclastic fallout could impact more distant towns such as Visviri.
