Numazawa
About Numazawa
Numazawa is a small, 2-km-wide dominantly dacitic-to-rhyolitic caldera constructed within an older Pliocene caldera. Eruptions of the 110,00 years before present (BP) rhyolitic Shibahara pyroclastic-fall deposit and the 71,000 BP rhyolitic Mukuresawa lava dome were followed by the dacitic Plinian Mizunuma eruption about 45,000 BP, emplacement of the Sozan lava dome at about 40-43 ka and the Maeyama lava dome at about 24,000 cal BP. The Numazawako pumice flow and Plinian eruption about 4,600 years BP resulted in formation of the 1.5 x 2 km Numazawako caldera, now largely filled by a caldera lake.
Eruption reports
Reports from GDACS and NASA EONET linked to this volcano.
No eruption reports in our records yet. New reports appear here automatically.
Earthquakes nearby, 30 days
Within about 50 km. Swarms of small quakes can sometimes accompany volcanic unrest.
No earthquakes recorded nearby in the last 30 days.