Ash emissions from Ibu volcano reach 1 800 m (5 900 feet) a.s.l., Indonesia

Volcanic ash from Ibu volcano in Indonesia was observed at 1 800 m (5 900 feet) above sea level at 16:40 UTC on October 30, 2025. The advisory was issued by the Darwin VAAC at 17:00 UTC.

According to the advisory, ash was present between the surface and flight level 060, which is approximately 1 800 m (5 900 feet) above sea level. The ash cloud was reported to be moving northeast at a speed of 28 km/h (17 mph). The current Aviation Color Code is Orange. Due to meteorological cloud cover, the ash cloud was not identifiable on satellite imagery, and its height and movement were determined based on multiple ground reports and model guidance.

Recent activity at Ibu volcano, based on reports for September 24–30, 2025, included frequent eruptions 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 also recorded in nighttime webcam images. The public was advised to stay 2 km away from the active crater and 3.5 km from the north crater wall opening.

Ibu is a stratovolcano located on Halmahera Island, Indonesia. It is known for frequent explosive eruptions producing ashfall and pyroclastic flows. Surrounding communities, including villages within 10 km (6.2 miles), are potentially at risk from ashfall and localized volcanic hazards. The volcano’s ongoing activity poses dangers such as ash emissions, lahars, and lava flows to these nearby populations.