[S-VC30] Volcanic and igneous activities, and these long-term forecasting

[SVC30-P02] Distribution area of volcanic bombs from the 1988-1989 eruption of Tokachidake volcano using a drone

Yuga Washizu¹, Kou Wakamatsu¹, *Eiichi Sato¹ (1.Hokkaido University of Education at Asahikawa)

Keywords:Tokachidake, volcanic bomb, drone

Tokachidake is an active volcano located in central Hokkaido, and three magmatic eruptions have occurred in the last 100 years (1926, 1962, and 1988-89). The most recent eruption, the 1988-89 eruption, originated from the 62-II crater formed by the 1962 eruption, and occurred 23 times from December 16, 1988 to March 5, 1989 (Katsui et al., 1990). Of the 23 eruptions, volcanic bombs were ejected widely in four cases (December 25, 1988, January 8, January 20, and February 8, 1989), and the ejected volcanic bombs mainly fell into the Ground Crater northeast of the 62-II crater (Katsui et al., 1990). Yamagishi (1991) showed the distribution and surface morphology of a total of 29 volcanic bombs inside the Ground Crater through a ground survey. However, the survey area was limited, and the distribution of volcanic bombs in the Ground Crater could not be clarified. In this study, we used a drone to clarify the detailed distribution of the volcanic bombs inside the Ground Crater, and examined the direction in which the volcanic bombs were released based on the relationship between the size of the volcanic bombs and the distance from the 62-II crater.