Numazawa volcano

shield volcano, caldera 1100 m / 3,609 ft
Honshu, Japan, 37.45°N / 139.58°E
Current status: normal or dormant (1 out of 5)

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.

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

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Fri, 18 Jun 2021 (GMT) (1 earthquake)
Jun 19, 2021 03:54:23.23 (18 Jun 2021 18:54:23 GMT)
2.9

8.9 km
34 km (21 mi)
Higashikambara-gun, 23 km southeast of Niitsu, Niigata Shi, Japan
Thu, 10 Jun 2021 (GMT) (1 earthquake)
Jun 10, 2021 18:13:28.17 (10 Jun 2021 09:13:28 GMT)
2.5

152 km
35 km (22 mi)
Yama-gun, 10.1 km southeast of Kitakata, Fukushima, Japan
Wed, 9 Jun 2021 (GMT) (1 earthquake)
Jun 09, 2021 13:36:48.22 (9 Jun 2021 04:36:48 GMT)
2.8

7.8 km
44 km (27 mi)
Kitakata-shi, 11 km northeast of Kitakata, Fukushima, Japan

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.


See also: Sentinel hub | Landsat 8
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