Mount Aso keeps crater restriction on 9 October

Mount Aso in Aso, Japan, remains under a Level 2 crater restriction after a 9 October report recorded white plumes above Nakadake.

Mount Aso (Asosan) remains under a crater restriction in Aso, Japan, after the Japan Meteorological Agency continued its Level 2 warning on 9 October 2026. The notice keeps visitors away from an area of about 1 km around Nakadake First Crater while the wider volcanic landscape remains accessible under local rules.

Level 2 crater restriction continues at Mount Aso on 9 October

The agency’s latest report covers activity from 2 to 9 October 2026 and states that the Level 2 crater-vicinity warning continued. White plumes rose as high as 1,000 metres above the crater rim, while volcanic tremor remained small in amplitude. The report also says that sulphur dioxide emissions remained high, meaning that activity was still elevated around Nakadake.

The warning applies to Aso City and Minami-Aso Village. The agency advises people to stay out of dangerous areas and to follow instructions from local authorities. Its 9 October volcanic report identifies the restricted area and the continuing warning. The crater restriction information is maintained by the Aso Volcano Disaster Prevention Council.

Mount Aso’s caldera puts the crater warning in context

Mount Aso is a volcanic complex in central Kyushu, rather than a single freestanding cone. The Aso caldera measures about 25 km from north to south and 18 km from east to west. Five principal peaks form the central cone group, including Nakadake, the active peak associated with the current warning.

The Japanese Environment Ministry describes Nakadake as one of the few active volcanoes where ordinary visitors can view a crater. Its national park information also identifies Kusasenri-ga-hama as a broad volcanic grassland within the complex. The Aso-Kuju National Park profile places the crater, grasslands and surrounding peaks within a landscape shaped by volcanic activity. This makes the 9 October restriction significant for the crater experience, but not a closure of the entire Aso destination.

The caldera is also part of the Aso UNESCO Global Geopark. UNESCO describes a landscape where cultivated land, communities and volcanic terrain occupy the same broad basin. The relationship between the warning and that geography is direct: the exclusion zone is concentrated around the active crater, while the larger caldera contains other landscapes and visitor facilities.

Visiting Mount Aso: what travellers from Western Europe should know

• The current crater restriction was confirmed on 9 October 2026, with Level 2 controls applying around Nakadake First Crater.
• Entry is prohibited within about 1 km of the crater. Visitors should not enter restricted areas and should follow local authority instructions.
• Kusasenri-ga-hama, the surrounding volcanic peaks and the wider Aso-Kuju National Park are separate from the crater exclusion zone, but access can change with volcanic gas and activity.
• The local language is Japanese, and Japan’s currency is the yen.
• Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.

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Frequently asked questions about Mount Aso

What is the current crater restriction at Mount Aso?

A Level 2 warning continued on 9 October 2026, with entry prohibited within about 1 km of Nakadake First Crater.

What happened at Mount Aso on 9 October 2026?

The Japan Meteorological Agency reported that the Level 2 warning continued and recorded white plumes rising up to 1,000 metres above the crater rim.

Where is Mount Aso and how do you get there?

Mount Aso is in central Kyushu, in Kumamoto Prefecture, Japan. It lies within Aso-Kuju National Park and the Aso UNESCO Global Geopark.