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

Volcanic ash from Ibu volcano in Indonesia was observed up to 1 830 m (6 000 feet) above sea level at 22:10 UTC on November 3, 2025. The advisory was issued by the Darwin VAAC at 22:30 UTC on the same day.

According to the advisory, a discrete volcanic ash cloud had earlier been observed at flight level 060 (approximately 1 830 m or 6 000 feet), with the last observation noted at 06:40 UTC. Subsequent data from Himawari-8 and the Indonesian Center for Volcanology and Geological Hazard Mitigation (CVGHM) did not indicate further ash emissions. The current Aviation Color Code is Orange. No ash cloud was detected in satellite imagery at the time of the advisory, and no forecast ash clouds were issued. The advisory was terminated due to lack of ongoing reports.

Recent reports from the Smithsonian / USGS Weekly Volcanic Activity Report indicate that eruptive activity at Ibu continued during late September 2025. Dense gray or white-and-gray ash plumes were observed rising 300–700 m (980–2 300 feet) above the summit and drifting in multiple directions, with occasional incandescence reported at the summit.

Ibu is a stratovolcano located on the island of Halmahera in eastern Indonesia. The volcano frequently produces ash plumes and has a history of moderate explosive eruptions. Known hazards include ashfall and localized lava flows. Nearby villages, including the settlement of Ibu, are situated within 10 km (6.2 miles) of the volcano and may be at risk during periods of heightened activity.