The occurrence of recent volcanic activity and its location on the Olca-Paruma complex is unclear. An unconfirmed flank eruption occurred in 1865-1867 on Olca; it may have occurred on Volcan Paruma, however. Fumarolic activity has been ongoing for over sixty years, and may have spiked in November 1989 - March 1990 when seismic and fumarolic activity occurred at the volcano. During that instance, strong fumarolic activity was observed on 13November 1989 from Ujina, and seismic activity was reported in mid-March of the subsequent year. This fumarolic activity occurred in coincidence with earthquakes at Iquique on the coast.