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Japan’s Shinmoedake Volcano Spews Ash Plume 3km Into the Sky

Japan’s Shinmoedake volcano erupts, sending ash 3km high, prompting safety alerts and warnings of falling rocks and pyroclastic flows.

Published By: Swastik Sharma
Last Updated: August 10, 2025 20:24:56 IST

A fierce volcanic eruption hit Japan’s Kirishima mountain range Shinmoedake volcano early today, producing a colossal ash plume over three kilometres high above the crater. The occurrence, which happened without preceding large-scale seismic alerts, has seen urgent safety notices issued by the Japan Meteorological Agency (JMA).

Regions Expected to see Ashfall

The JMA predicts moderate ashfall in Miyazaki Prefecture’s Kobayashi and Takaharu and Kagoshima Prefecture’s Kirishima. North Volcano Observatory has warned residents in the affected areas to take measures to guard against respiratory irritation and impaired visibility due to suspended volcanic ash.

Officials have warned that small volcanic rocks may fall within some 14 kilometres northeast of the crater. People and tourists within the area where the rocks may fall have been instructed to stay alert and limit outdoor exposure, especially in open places where debris may hurt them.

Alert Level Raised to Three

The eruption warning level for Shinmoedake has been placed at Level 3 on the five-level scale of Japan Meteorological Agency. This prevents people from entering the slopes of the volcano and tells residents to remain vigilant against major volcanic rocks being thrown out up to three kilometres from the crater.

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Furthermore, the JMA advised that there is a possibility of pyroclastic flows lava-like currents of hot gas and rock material within two kilometres of the crater. Pyroclastic flows are extremely hazardous as they travel at high speeds, are extremely hot, and have great destructive power. 

Precautionary Actions for Residents

Local authorities have recommended residents to use masks and protective goggles when outdoors, keep windows shut to keep ash out of homes, and drive carefully as roads may be slippery owing to ash buildup. Emergency services remain on standby should there be any further activity or escalation.

The Shinmoedake volcano, which had its last major eruptive activity in recent years, is closely watched by the JMA for possible signs of heightened seismic or volcanic activity. Authorities have said the ongoing eruption carries localized threats but that it is still worthwhile for people living in the wider area to remain aware through official notices and announcements.

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The JMA has called on the public not to travel near the volcano and to heed all evacuation or safety orders from local governments.

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