Volcanic ash emissions from Ibu volcano reach 1 830 m (6 000 feet) a.s.l., Indonesia

Volcanic ash from Ibu volcano in Indonesia was observed at an altitude of 1 830 m (6 000 feet) above sea level at 04:40 UTC on October 31, 2025. The advisory was issued by the Darwin VAAC at 05:00 UTC on the same day.

According to the advisory, the ash cloud was reported between the surface and flight level 060 (approximately 1 830 m or 6 000 feet), with movement towards the northeast at a speed of 18.5 km/h (11.5 mph). Satellite imagery could not confirm the ash due to meteorological clouds, but multiple ground reports indicated intermittent discrete eruptions. The current Aviation Color Code is Orange.

Recent reports from the Global Volcanism Program indicate that Ibu volcano experienced ongoing eruptions from September 24 to September 30, 2025, with dense gray or white-and-gray ash plumes rising 300–700 m above the summit and drifting in multiple directions. Incandescence at the summit was also observed in some nighttime images. The Alert Level remained at 2, and the public was advised to stay 2 km from the active crater and 3.5 km from the north crater wall opening.

Ibu is a stratovolcano located on Halmahera Island, Indonesia. The volcano is characterized by frequent explosive activity, producing ashfall that can affect surrounding villages. Hazards include ashfall, pyroclastic flows, and lava domes. Populated areas at risk include several settlements on northern Halmahera within a few kilometers of the volcano.