A very dense white to light-gray ash cloud from Dukono was reported on 23 June by a commercial aircraft pilot. The cloud was rising ~600-1,500 m above the summit . . . . VSI notes that Dukono is very active, with small eruptions from the main crater almost every day. The height of the eruption column averages 300-600 m above the crater rim. No significant changes in activity have occurred in June or July.

Geological Summary. Reports from this remote volcano in northernmost Halmahera are rare, but Dukono has been one of Indonesia's most active volcanoes. More-or-less continuous explosive eruptions, sometimes accompanied by lava flows, have occurred since 1933. During a major eruption in 1550 CE, a lava flow filled in the strait between Halmahera and the N-flank Gunung Mamuya cone. This complex volcano presents a broad, low profile with multiple summit peaks and overlapping craters. Malupang Wariang, 1 km SW of the summit crater complex, contains a 700 x 570 m crater that has also been active during historical time.

Information Contacts: ICAO; W. Tjetjep, VSI.