III. 秋田駒ケ岳の噴火活動史 III. A Historical Sketch of the Recorded Eruptions of Akita-Komagatake(III. History of Activity of Akita-Komagatake)
A mixed eruption took place at Medake, biggest central cone of the composite volcano Akita-Komagatake, in 1970-71. This is the first magmatic eruption of the volcano in the historical age. All the former eruptions on record were phreatic explosions. The new lava is andesite, though older lavas of the central cones are basalts.
火山.第２集 16(2-3), 103-106, 1971