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

Volcanic ash from Klyuchevskoy volcano in Russia was observed at 7 000 m (23 000 feet) above sea level at 17:20 UTC on October 13, 2025. The advisory was issued by the Tokyo VAAC at 18:00 UTC on the same date.

According to the VAAC advisory, ash emissions were continuing and were observed spreading east at 28 km/h (17 mph). The ash cloud extended from the surface up to 7 000 m (23 000 feet). The forecast indicates the ash cloud may reach up to 7 300 m (24 000 feet) in the following 6 to 18 hours. Some parts of the volcanic ash cloud were obscured by meteorological clouds. No Aviation Color Code was stated in this advisory.

According to the Smithsonian / USGS Weekly Volcanic Activity Report for late September 2025, only fumarolic emissions had been observed recently at Klyuchevskoy, with the Aviation Color Code lowered to Green on September 25, 2025. No ongoing ash emissions were noted for the last reported period prior to this advisory.

Klyuchevskoy is a prominent stratovolcano located on the Kamchatka Peninsula in Russia. It stands 4 754 m (15 597 feet) tall and is among the most active volcanoes in the region. Known hazards from this volcano include ashfall, pyroclastic flows, and lava flows. The nearby settlement of Klyuchi, located approximately 30 km (19 miles) to the northeast, is the closest population center potentially at risk during significant eruptive episodes.