Volcanic ash emissions from Klyuchevskoy volcano reach 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 17:20 UTC on October 15, 2025. The advisory was issued by the Tokyo VAAC at 18:00 UTC on October 15, 2025.

Satellite imagery from Himawari-8 confirmed ash emissions reaching up to flight level 230, equivalent to approximately 7 000 m (23 000 feet) above sea level. The ash cloud was observed moving southwest at a speed of approximately 28 km/h (17 mph). Some portions of the ash cloud were obscured by meteorological clouds. No Aviation Color Code was stated in this advisory.

The Smithsonian / USGS Weekly Volcanic Activity Report for late September 2025 noted that wind was no longer resuspending previously deposited ash on Klyuchevskoy’s north flank; only fumarolic emissions were observed at that time. The Aviation Color Code was lowered to Green on September 25, 2025.

Klyuchevskoy is a large stratovolcano located on the Kamchatka Peninsula in Russia. It is known for frequent eruptive activity producing ash plumes, pyroclastic flows, and lava flows. The nearest settlement, Klyuchi, is located about 30 km (19 miles) northeast of the volcano and can be affected by ashfall during significant eruptions. Ongoing hazards include ashfall, potential lahars, and pyroclastic flows, posing risks to aviation and nearby communities.