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 23:20 UTC on October 13, 2025. The advisory was issued by the Tokyo VAAC at 00:00 UTC on October 14, 2025.

According to the advisory, ash emissions were continuing and were observed between the surface and flight level 230 (approximately 7 000 m or 23 000 feet). The ash was moving east at a speed of 28 km/h (17 mph) and some parts of the ash cloud were obscured by meteorological clouds. No Aviation Color Code was stated in this advisory.

The latest Smithsonian / USGS Weekly Volcanic Activity Report for September 24–30, 2025, indicated that only fumarolic emissions were observed at Klyuchevskoy and that wind had stopped resuspending previously deposited ash. The Aviation Color Code was lowered to Green on September 25, 2025.

Klyuchevskoy is a stratovolcano located on Russia’s Kamchatka Peninsula, standing at 4 754 m (15 597 feet) above sea level. Known hazards include ashfall, pyroclastic flows, and lava flows. The nearest populated centers at risk are the villages of Klyuchi and Kozyrevsk, both located within 30 km (19 miles) of the volcano.