Adatara is a stratovolcano made up of three cones. These cones are basaltic to andesitic in composition. The summit of Adatara is a lava dome. Adatara has had two historical eruptions. The last eruption of Adatara was in 1990.

September 15, 1997

Four mountain hikers were killed due to falling into a large summit crater on Adatara. The cause of death was the inhalation of H2S gas in the bottom of the crater. Warnings were given to the public for people to stay away from the volcano, as activity in the area has become more frequent over the past few years. This increased activity has led to mud spouting from ponds on the crater floor and an increase in fumarolic activities.