Ash plume from Klyuchevskoy volcano reaches 7 000 m (23 000 feet) a.s.l., Russia

Volcanic ash from Klyuchevskoy volcano in Russia was observed at an altitude of 7 000 m (23 000 feet) above sea level at 21:00 UTC on October 12, 2025. The advisory was issued by the Tokyo VAAC at 21:25 UTC.

According to the VAAC advisory, the ash cloud originated from an eruption reported at 19:00 UTC on October 12, 2025, and extended toward the southeast. Ash was observed in the range from the surface up to flight level 230, or approximately 7 000 m (23 000 feet). The ash cloud was reported to be moving southwest at 37 km/h (23 mph). No Aviation Color Code was stated in this advisory. The information source was Himawari-8 satellite imagery.

According to the Smithsonian / USGS Weekly Volcanic Activity Report, during the week of September 24–30, 2025, only fumarolic activity was observed at Klyuchevskoy, and the Aviation Color Code was lowered to Green on September 25, 2025. No eruptive activity was reported during that period.

Klyuchevskoy is a stratovolcano located on the Kamchatka Peninsula in Russia. Known for its frequent explosive eruptions, hazards include ashfall, lava flows, pyroclastic flows, and lahars. The nearby settlement of Klyuchi is about 30 km (19 miles) northeast of the volcano and is at potential risk during significant eruptive episodes.