Ash from Ibu volcano reaches 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 10:50 UTC on October 30, 2025. The advisory was issued by the Darwin VAAC at 11:06 UTC on the same day.

The ash cloud was reported at surface to flight level 060 (approximately 1 830 m or 6 000 feet), moving toward the northeast at a speed of approximately 28 km/h (17 mph). Ash was not identifiable on satellite imagery due to meteorological clouds, but ground reports indicated intermittent discrete eruptions were ongoing. The current Aviation Color Code is Orange.

According to the Smithsonian / USGS Weekly Volcanic Activity Report for September 24 – 30, 2025, Ibu volcano continued erupting with dense gray or white-and-gray ash plumes rising 300–700 m above the summit and drifting in multiple directions. Incandescence was visible at the summit in a few nighttime webcam images. The Alert Level for Ibu remained at 2 (on a four-level scale), with an exclusion zone of 2 km (1.2 miles) from the active crater and 3.5 km (2.2 miles) from the north crater wall opening advised.

Ibu volcano is a stratovolcano located on Halmahera Island, Indonesia. It is known for its frequent explosive eruptions that produce ash plumes and occasional pyroclastic flows. The volcano poses risks of ashfall and pyroclastic activity to nearby residents, with the closest significant settlements being small villages within 10 km (6.2 miles) of the crater. The region is sparsely populated, but individuals within exclusion zones remain at increased risk during periods of volcanic activity.