Mashu, Japan

Caldera · 857 m (2,812 ft) · Hokkaido-Japan

Mashu is a caldera in Japan, 857 m (2,812 ft) high. Its last known eruption: aD 1 to 1499. NOAA records no significant eruption here.

Mashu on the map

Mashu and the volcanoes within 300 km, colored by when each last erupted.

Since 1964
1900 to 1963
1800s
AD 1 to 1799
Before AD 1, or undated

Open the live map with volcanic ash advisories

The volcano

Type: Caldera
Elevation: 857 m (2,812 ft)
Country: Japan
Region: Hokkaido-Japan
Summit: 43.572° N, 144.561° E
Last known eruption: AD 1 to 1499
Holocene activity known from: Radiocarbon
Smithsonian volcano number: 285081

Significant eruptions

NOAA records eruptions that killed, did damage, were very large, or set off a tsunami or earthquake.

None on record.

Around it

The volcanoes within 300 km.

Earthquakes near Mashu Volcanic ash advisories on the live map

Sources

Volcanoes and significant eruptions from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. Volcano numbers are the Smithsonian Institution’s Global Volcanism Program’s.