Continuous ash emissions from Klyuchevskoy volcano observed at 7 010 m (23 000 feet) a.s.l., Russia

Volcanic ash from Klyuchevskoy volcano in Russia was observed at 7 010 m (23 000 feet) above sea level at 11:20 UTC on October 14, 2025. The advisory was issued by the Tokyo VAAC at 12:00 UTC on October 14, 2025.

The advisory reports that ash was continuously observed in satellite imagery, specifically by Himawari-8, at altitudes up to flight level 230 (approximately 7 010 m or 23 000 feet). The ash cloud was moving southeast at a speed of approximately 37 km/h (23 mph). No Aviation Color Code was stated in this advisory. Forecasts indicated the ash cloud would continue to move and disperse over the next 6 to 12 hours.

According to the Smithsonian / USGS Weekly Volcanic Activity Report for September 24–30, 2025, no eruptive activity or resuspended ash from Klyuchevskoy was detected in late September. Only fumarolic emissions were observed, and the Aviation Color Code was lowered to Green on September 25, 2025.

Klyuchevskoy is a large, symmetrical stratovolcano located on the Kamchatka Peninsula in Russia. It is the highest active volcano in Eurasia, with a summit elevation of 4 754 m (15 597 feet). Primary volcanic hazards include ashfall, pyroclastic flows, and lava flows, which can affect nearby communities such as Klyuchi, located about 30 km (19 miles) northeast. The volcano presents risks to aviation and populations downwind during significant eruptive episodes.