| Numazawa | |
|---|---|
 Lake Numazawa | |
| Highest point | |
| Elevation | 2,740 ft (840 m) |
| Listing | Volcanoes in Japan |
| Coordinates | 38°57′40″N 140°47′17″E / 38.961°N 140.788°E / 38.961; 140.788 |
| Geography | |
  NumazawaFukushima Prefecture
| |
| Geology | |
| Mountain type | Shield volcano |
| Last eruption | 3,400 BCE |
Numazawa is a caldera and lake in Ōnuma District of Fukushima Prefecture, Japan. The caldera measures 2 km (1.2 mi) across and the lake that occupies it measures 96 m (315 ft) deep. The volcanic caldera was constructed within the older and larger Uwaigusa caldera which is 4.2 to 4.0 million years old. The volcano first erupted 110,000 years before present (BP) produced pyroclastics. At 71,000 BP, the Mukuresawa lava dome formed, and at 45,000 BP, a Plinian eruption occurred. Two additional lava domes developed in 43,000 BP and 20,000 BP. The caldera-forming Plinian eruption eruption occurred at 4,600 BP. A VEI 5 eruption occurred at 3,400 BP.
See also
References
- Yamamoto, Takahiro (2007). "A rhyolite to dacite sequence of volcanism directly from the heated lower crust: Late Pleistocene to Holocene Numazawa volcano, NE Japan". Journal of Volcanology and Geothermal Research. 167 (1–4): 119–133. doi:10.1016/j.jvolgeores.2007.05.011.
- "Numazawa". Global Volcanism Program. Smithsonian Institution.
| 100 Famous Japanese Mountains | |||||||||
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| Tōhoku region Jōshinetsu region |
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| Chūbu region |
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