# Mount Ontake eruption commemorations in Nagano

> Live situation record from CLSTR: https://clstr.news/situations/mount-ontake-eruption-commemorations-in-nagano
> Updated: 2026-09-27T08:12:52.000Z. Sources: 4. Developments: 2.

Nagano Prefecture observes annual commemorations related to the 2014 Mount Ontake eruption. The prefecture designates the period from August 26 to September 27 as ‘Shinshu Volcanic Disaster Prevention Month’ to promote awareness and honor the 58 people killed and five missing during the disaster.

On September 27, a memorial ceremony was held in Otaki village, attended by approximately 60 residents and bereaved families. During the event, participants held a moment of silence at 11:52 a.m. to mark the exact time of the eruption. The director-general of the Japan Meteorological Agency attended the ceremony, pledging continued efforts to provide accurate information following a Supreme Court dismissal of a lawsuit filed by families regarding alert level protocols.

## Timeline

### 2026-09-27: Mount Ontake eruption memorial held in Nagano

A memorial ceremony was held in Nagano Prefecture to mark the 12th anniversary of the Mount Ontake eruption, which killed 58 people and left five missing in 2014.

2 sources. https://clstr.news/cluster/mount-ontake-eruption-memorial-held-in-nagano

### 2026-09-26: Nagano Prefecture observes Shinshu Volcanic Disaster Prevention Day

Nagano Prefecture observes ‘Shinshu Volcanic Disaster Prevention Day’ on September 27 to commemorate the 2014 Mount Ontake eruption and promote safety awareness in Japan’s volcanic regions.

2 sources. https://clstr.news/cluster/nagano-prefecture-observes-shinshu-volcanic-disaster-prevention-day

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Cite as: Mount Ontake eruption commemorations in Nagano. CLSTR, https://clstr.news/situations/mount-ontake-eruption-commemorations-in-nagano