Shinmoedake eruption sends ash plume to 7 km above sea level, Japan
Shinmoedake volcano, part of the Kirishimayama complex in Japan, erupted on August 27, 2025, producing an ash plume rising to 7 km (23 000 feet) a.s.l., which drifted south at 19 km/h (12 mph).
Shinmoedake eruption on August 27, 2025. Credit: KTS, Rita Bauer
Volcanic ash from Shinmoedake, a peak within the Kirishimayama volcanic group in Kyushu, Japan, rose to 7 000 m (23 000 ft) above sea level following eruption at 19:53 UTC on August 27, according to the Tokyo Volcanic Ash Advisory Center (VAAC).
The ash plume rose to 7 km (23 000 feet) above sea level and drifted southward at 19 km/h (12 mph). This marks the highest observed ash column since July 3, when a plume rose to approximately 5 km (16 400 feet).
As of August 28, no disruptions to commercial aviation have been reported, although previous eruptions in this volcanic complex have caused temporary flight cancellations at Kagoshima Airport.
The Japan Meteorological Agency maintains a 3 km (1.8 miles) exclusion zone around the Shinmoedake crater due to ongoing eruptive activity and the potential for ballistic ejecta and localized ashfall.
Shinmoedake, part of a complex of stratovolcanoes collectively referred to as Kirishimayama, has shown persistent activity throughout August 2025, with ash emissions and sulfur dioxide (SO2) output averaging 1 000 tons per day. Plumes were regularly observed rising up to 500 m (1 640 feet) above the crater rim.
Kirishimayama’s eruptive history includes explosive events, pyroclastic flows, and lava dome formation. In 2018, an explosive eruption of Shinmoedake generated ash plumes up to 7.6 km (25 000 feet) above sea level.
The volcano is situated between Kagoshima and Miyazaki prefectures, with the city of Miyazaki, located 35 km (22 miles) east, among the areas potentially affected by ashfall depending on wind direction and eruption dynamics.
I'm a dedicated researcher, journalist, and editor at The Watchers. With over 20 years of experience in the media industry, I specialize in hard science news, focusing on extreme weather, seismic and volcanic activity, space weather, and astronomy, including near-Earth objects and planetary defense strategies. You can reach me at teo /at/ watchers.news.
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