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 04:40 UTC on November 2, 2025. The advisory was issued by the Darwin VAAC at 05:00 UTC on the same day.

The observed volcanic ash cloud was reported between the surface and 1 830 m (6 000 feet), based on ground observations and model guidance. The ash was moving east at approximately 28 km/h (17 mph). Volcanic ash was not identifiable on satellite imagery due to meteorological clouds. The current Aviation Color Code is Orange.

According to the Smithsonian / USGS Weekly Volcanic Activity Report, activity at Ibu volcano continued through 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 incandescence was visible at the summit in several nighttime webcam images. The public was advised to remain 2 km (1.2 miles) away from the active crater and 3.5 km (2.2 miles) from the north crater wall opening.

Ibu volcano is a stratovolcano located on Halmahera Island, Indonesia. Known hazards include ashfall, pyroclastic flows, and lava emissions, which can impact nearby populated areas. The closest settlements are located within 10 km (6.2 miles) of the volcano, making continued monitoring and adherence to exclusion zones crucial for safety.