Ash emissions from Klyuchevskoy volcano reach 7 010 m (23 000 feet) a.s.l., Russia

Volcanic ash from Klyuchevskoy volcano in Russia was observed at an altitude of 7 010 m (23 000 feet) above sea level at 23:20 UTC on October 12, 2025. This advisory was issued by the Tokyo VAAC at 00:00 UTC on October 13, 2025.

According to the advisory, ash cloud emissions are continuing. The volcanic ash cloud was observed between the surface and flight level 230, which corresponds to approximately 7 010 m (23 000 feet). The ash was moving towards the southwest at a speed of around 37 km/h (23 mph). No Aviation Color Code was stated in this advisory. Forecasts indicate that the ash cloud could ascend to 7 320 m (24 000 feet) within the next 18 hours.

According to the Smithsonian/USGS Weekly Volcanic Activity Report for the period of September 24–30, 2025, wind was no longer resuspending ash previously deposited on the north flank of Klyuchevskoy. Only fumarolic emissions were observed, and the Aviation Color Code was lowered to Green on September 25, 2025.

Klyuchevskoy is a stratovolcano located in Russia’s Kamchatka Peninsula. The volcano is known for frequent explosive eruptions producing ash plumes, lava flows, and pyroclastic flows. Hazards from its eruptions include ashfall, pyroclastic flows, and lava effusion. The nearest settlement is Klyuchi, located approximately 30 km (19 miles) to the north-northeast, and local populations and air traffic may be at risk during periods of heightened activity.