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

Volcanic ash from Klyuchevskoy in Russia was observed at 7 000 m (23 000 feet) above sea level at 15:30 UTC on October 15, 2025. The advisory was issued by the Tokyo VAAC at 16:05 UTC.

According to the VAAC advisory, the ash cloud was detected from the surface up to 7 000 m (23 000 feet), extending southwest from the volcano. Movement was toward the southwest at 28 km/h (17 mph). Some portions of the ash were obscured by meteorological clouds. The information source was Himawari-8 satellite imagery. No Aviation Color Code was stated in this advisory.

Recent reports from the Smithsonian/USGS Weekly Volcanic Activity Report indicate that wind was no longer resuspending ash previously deposited on the north flank of Klyuchevskoy by the end of September. Only fumarolic emissions were observed during the last reporting period, and the Aviation Color Code was lowered to Green on September 25, 2025.

Klyuchevskoy is a large stratovolcano located on the Kamchatka Peninsula. It is one of the most active volcanoes in Russia, producing hazards such as ashfall, lava flows, and pyroclastic flows. The towns of Klyuchi and Kozyrevsk, both located within 30 km (19 miles) of the volcano, are among the nearest settlements at potential risk from volcanic activity.