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

Volcanic ash from Ibu volcano in Indonesia was observed at 1 830 m (6 000 feet) above sea level at 22:30 UTC on November 2, 2025. The advisory was issued by the Darwin VAAC at 23:00 UTC on November 2, 2025.

Ash was reported at the surface up to flight level 60, which corresponds to approximately 1 830 m (6 000 feet). The ash cloud was reported moving east at a speed of 37 km/h (23 mph). The advisory notes that volcanic ash was not identifiable on current satellite imagery due to meteorological cloud cover. The current Aviation Color Code is Orange.

According to the Smithsonian / USGS Weekly Volcanic Activity Report, eruptive activity at Ibu volcano continued during 24–30 September 2025. Dense gray or white-and-gray ash plumes rose 300–700 m (980–2 300 feet) above the summit and drifted in multiple directions. The Alert Level was at 2, and the public was advised to stay 2 km (1.2 miles) away from the active crater and 3.5 km (2.2 miles) from the north crater wall opening.

Ibu is a stratovolcano located on the island of Halmahera, Indonesia. It is characterized by a persistent lava dome within its crater, and regular ash-producing eruptions. Primary hazards include ashfall, pyroclastic flows, and lava dome collapse. Populations near the volcano, particularly in small villages within a few kilometers of the summit, are at risk from these hazards.