Ash cloud from Ibu volcano observed at 1 830 m (6 000 feet) a.s.l., Indonesia

Volcanic ash from Ibu in Indonesia was observed at 1 830 m (6 000 feet) above sea level at 11:30 UTC on October 22, 2025. The advisory was issued by the Darwin VAAC at 11:50 UTC that same day.

The ash cloud was reported at surface to flight level 060 (approximately 1 830 m or 6 000 feet). The direction of ash movement was toward the northeast at a speed of 19 km/h (12 mph). The presence and altitude of volcanic ash were determined by ground reports and model guidance, as the ash cloud was not identifiable on satellite imagery due to darkness. 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, drifting in various directions. The Alert Level remained at 2, and 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 in Indonesia. Typical hazards include ashfall and pyroclastic flows, with nearby rural settlements at risk within a radius of several kilometers. Vigorous eruptive activity can disrupt air traffic and impact communities depending on wind direction and ash dispersal.