Volcanic ash from Marapi volcano observed at 3 185 m (10 450 feet) a.s.l., Indonesia

Volcanic ash from Marapi in Indonesia was observed at 3 185 m (10 450 feet) above sea level at 04:40 UTC on November 3, 2025. The advisory was issued by the Darwin VAAC at 05:07 UTC on the same day.

Ash was reported at a height of 300 m (980 feet) above the 2 885 m (9 465 feet) summit, reaching a total altitude of approximately 3 185 m (10 450 feet) above sea level. The volcanic ash cloud was moving southeast at a speed of 19 km/h (12 mph). The advisory noted that the ash plume was not identifiable on satellite imagery, and the height was based on ground observations. The Aviation Color Code is Orange. Volcanic ash was expected to dissipate within 3 to 6 hours.

According to the Smithsonian / USGS Weekly Volcanic Activity Report, eruptive activity at Marapi continued during September 24–30, 2025. Eruptive events were recorded, but visual confirmation was sometimes prevented by weather. An event on September 26, 2025, produced a dense white-and-gray ash plume that rose 1 000 m (3 300 feet) above the summit and drifted east. The Alert Level remained at 2, and the public was advised to stay 3 km (1.9 miles) away from the active crater.

Marapi is a stratovolcano located in West Sumatra, Indonesia. Its known hazards include ashfall, pyroclastic flows, and lahars. Nearby populations in the region, including the city of Bukittinggi (approximately 30 km [19 miles] to the east), may be at risk during significant eruptive events. The volcano is one of the most active in Sumatra and poses ongoing risks due to its frequent eruptions.