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Dukono is a remote volcano on the island of Halmahera. Dukono is one of the world's most active volcanoes and has been in persistent activity since 1933. During a major eruption in 1550, a lava flow filled in the strait between Halmahera and the north-flank cone of Gunung Mamuya. Fatalities were occurred during that eruption, too. Dukono is a complex volcano with a broad, low profile, multiple summit peaks and overlapping craters. Malupang Wariang, 1 km southwest of Dukono's summit crater complex, contains a 700 x 570 m crater that has also been active during historical time.
Dukono is a complex volcano and one of the most active volcanoes in Indonesia in historic time. The first historic eruption was in 1550. The eruption was explosive but also produced lava flows. Deaths and damage were reported but details are not known. Dukono had smaller eruptions in 1719, 1868, and 1901 and it has been erupting continuously from 1933 to the present. The eruptions have been explosive and also produced lava flows and mud flows. The eruptions have caused damage but no deaths.
The volcanologists visited the volcano in 1978 and 1979. On the first visit, bombs as long as 4 m were being thrown as far as 250 m from the vent. An ash cloud rose up to 10 km above the crater and the ash was blown as far away as 15 km. the quiet periods lasting 6-8 hours were reported. On the second visit, explosive ejection of ash was observed.