On 19 June, CVGHM reported that during 30 May-12 June, seismicity from Dukono decreased and white plumes at altitudes of 1.4-1.8 km (4,600-5,900 ft) a.s.l. were spotted when clouds did not inhibit observations The Alert Level was decreased to 2 (on a scale of 1-4) on 13 June. Residents and visitors were not permitted within 2 km of the summit.

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.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)