Numazawa

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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)

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Typical eruption style: highly explosive
Numazawa volcano eruptions: ca. 2980 BC (large central vent eruption with caldera collapse)
Last earthquakes nearby:

Time	Mag. / Depth	Distance	Location
Sun, 19 May
Sun, 19 May 14:36 UTC	M 0.3 / 8 km	19 km	福島県会津 (Aizu, Fukushima Pref.)
Sun, 19 May 13:53 UTC	M 0.9 / 7 km	19 km	福島県会津
Sun, 19 May 13:53 UTC	M 0.4 / 9 km	19 km	福島県会津
Sun, 19 May 13:47 UTC	M 0.6 / 8 km	19 km	福島県会津
Sun, 19 May 09:04 UTC	M 0.6 / 7 km	16 km	福島県会津

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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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