1. Out-flow of Lava and Explosion of Cinder on the Eruption of Akita-Komagatake(V. Features of the Activity of the 1970-71 Eruption of Akita-Komagatake)

Abstract

A number of lava flow and of volcanic bombs were thrown out from Akita Komagatake when it had been erupting from 1970 to 1971. The volcanic activity was appeared to be proceeded in two different ways and the variations in the dimensions of the lava flows, together with the heights of the cinder cones, was observed. The dimension of lava flow was 1300m² in September 19, 4300m² in October 14, 7000m² in November 18, 80000m² in December 12, 82000m² in January 20. The heights of cinder cone was 5m in September 23, 47m in November 3 and 58m in November 19. The top of the vent was 1035℃ yet in September 24.