The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Dukono continued at high levels through 6 May. Daily eruptive events in 2025 were in the 60-394 range, with an average of 227 per day. Gas-and-ash plumes generally rose 200-2,500 m above the summit, though during 27 March-30 April plumes rose as high as 1,400 m above the summit. The plumes drifted E, NW, and W towards populated areas. On 30 April occasional rumbling was followed by a strong boom felt by residents as far as 11 km away. During 1-6 May white-and-gray ash plumes rose 100-1,500 m above the crater rim and drifted in variable directions. Minor ashfall was reported in Mamuya, 11 km N, on 1 May and rumbling was heard during 1-2 May. The Alert Level remained at Level 2 (on a scale of 1-4) and the public was warned to stay 4 km away from the Malupang Warirang Crater.

Geological Summary. The Dukono complex in northern Halmahera is on an edifice with a broad, low profile containing multiple peaks and overlapping craters. Almost 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 Gunung Mamuya cone, 10 km NE. Malupang Wariang, 1 km SW of the summit crater complex, contains a 700 x 570 m crater that has also had reported eruptions.

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