Abstract
Geochemical studies of volcanic activities of Volcano Ooshima, Izu during the period from March to May, 1951, are reported briefly. Max. temperature of fresh lava is 1120°C, flowing velocity on the slopes of 3035°is about 4 m/sec, and there is no remarkable rotation of ejecta in the air.Many kinds of bluish green copper compounds, yellowish brown iron compounds, white gypsum and etc are found. Bluish sublimates show the weak radioactivity and radon content of volcanic gas is about 13 mache. Volcanic gases contain remarkable chlorine compounds and frel hydrogen. Relation between magnetic substances and juvenile substances is discussed.
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