Volcanic ash from Marapi volcano reported up to 4 300 m (14 100 feet) a.s.l., Indonesia

Volcanic ash from Marapi in Indonesia was reported up to 4 300 m (14 100 feet) above sea level at 15:54 UTC on October 9, 2025. The Darwin VAAC issued the advisory at 22:20 UTC on the same day.

According to the advisory, volcanic ash was reported from ground observations up to flight level 140, corresponding to about 4 300 m (14 100 feet) above sea level. However, no ash cloud was identifiable on Himawari-9 satellite imagery at 22:00 UTC due to meteorological cloud cover. The advisory noted that the ash was expected to have dissipated, with no further reports of new or ongoing eruption. The current Aviation Color Code is Orange.

The Smithsonian/USGS Weekly Volcanic Activity Report for September 24-30, 2025, stated that Marapi volcano continued to show eruptive activity during that time, including observed ash plumes rising up to 1 000 m (3 300 feet) above the summit on September 26. The volcano remained at Alert Level 2, with the public warned to stay 3 km (1.9 miles) away from the active crater.

Marapi is a stratovolcano located in western Sumatra, Indonesia. It is one of the most active volcanoes in Sumatra and is known for ash-producing eruptions, lava domes, and pyroclastic flows. Hazards include ashfall, pyroclastic flows, and lahars. The nearby city of Bukittinggi and smaller settlements may be at risk during larger eruptive events, especially within 10 km (6.2 miles) of the volcano.