Volcanic ash from Ibu volcano observed at 2 100 m (6 900 feet) a.s.l., Indonesia

Volcanic ash from Ibu volcano in Indonesia was observed at 2 100 m (6 900 feet) above sea level at 18:20 UTC on October 13, 2025. The advisory was issued by the Darwin VAAC at 18:50 UTC on the same day.

The ash cloud was reported between the surface and flight level 70, corresponding to approximately 2 100 m (6 900 feet). The ash was moving northeast at a speed of roughly 9 km/h (5.6 mph), based on model guidance. The ash was not discernible on satellite imagery due to meteorological cloud cover and darkness, but ground reports indicated intermittent eruptions. The current Aviation Color Code is Orange.

According to the Smithsonian / USGS Weekly Volcanic Activity Report for September 24–30, 2025, the eruption at Ibu continued 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 visible on several nights. The Alert Level remained at 2, and the public was advised to stay 2 km away from the active crater and 3.5 km away from the northern crater wall opening.

Ibu is a stratovolcano located on Halmahera Island, Indonesia. The volcano is known for frequent eruptions, producing ash plumes and occasional lava flows. Hazards include ashfall, pyroclastic flows, and lava bombs, which pose risks to local populations, especially within a few kilometers of the crater. The nearest settlements are small villages; larger towns such as Jailolo and Tobelo are tens of kilometers away but could be affected by significant ashfall events.