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Numazawa volcano

shield volcano, caldera 1100 m / 3,609 ft
Honshu, Japan, 37.45°N / 139.58°E
Current status: dormant (1 out of 5)
Numazawa volcano books
Typical eruption style: highly explosive
Numazawa volcano eruptions: ca. 2980 BC (large central vent eruption with caldera collapse)
TimeMag. / DepthDistanceLocation
Thu, 29 Jun
Thu, 29 Jun 11:53 UTCM 3.2 / 9 km21 kmWESTERN FUKUSHIMA PREF
Fri, 9 Jun
Fri, 9 Jun 18:54 UTCM 2.6 / 12 km18 kmWESTERN FUKUSHIMA PREF
Fri, 9 Jun 18:36 UTCM 2.6 / 10.3 km18 kmWESTERN FUKUSHIMA PREF
Numazawa volcano has a small 1.5 x 2 km wide caldera which formed during a major eruption about 4600 years BP, producing large quantities of dacitic-to-rhyolitic pumice fall and flow deposits. The caldera is filled by a lake.

Background:

Numazawa volcano is dominantly dacitic to rhyolitic, and has a long history of very explosive eruptions. There evidence of an older Pliocene caldera.

Important stratigraphic deposits include:
- the rhyolitic Shibahara pyroclastic-fall deposit 110,00 years before present (BP)
- the dacitic Mukuresawa lava dome 71,000 years BP,
- the dacitic plinian Mizunuma eruption about 45,000 y BP
- the Sozan lava dome at 43,000 y BP
- the So-zan lava dome at about 20,000 y BP,
- the Numazawako pumice flow and plinian eruption about 4600 y BP.


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