Volcanic ash from Ibu volcano observed at 2 400 m (7 900 feet) a.s.l., Indonesia

Volcanic ash from Ibu volcano in Indonesia was observed at 2 400 m (7 900 feet) above sea level at 22:00 UTC on October 25, 2025. The advisory was issued by the Darwin VAAC at 22:20 UTC on October 25, 2025.

Ash clouds were reported between the surface and flight level 080, corresponding to 2 400 m (7 900 feet). Meteorological clouds prevented satellite identification of the ash, but intermittent discrete eruptions were expected based on ground observations and model guidance. The predicted ash movement was toward the southeast at approximately 9 km/h (5.6 mph). The current Aviation Color Code is Orange.

According to the latest Weekly Volcanic Activity Report, the eruption at Ibu volcano continued during September 24 to 30, 2025. Dense gray or white-and-gray ash plumes rose 300-700 m (980-2 300 feet) above the summit and drifted in various directions. Incandescence at the summit was occasionally visible at night. The Alert Level remained at 2, and the public was advised to stay 2 km (1.2 miles) 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 in Indonesia. Its primary hazards are ashfall, pyroclastic flows, and lava domes. The region is sparsely populated, but some villages and communities are located within 10 km (6.2 miles) of the volcano, making local populations vulnerable to volcanic hazards.