17:15 〜 18:30 [HTT08-P02] A survey for the larger block distribution on the block slopes around the summit area of Mount Tateshina, central Japan: an application of combined on-site measurements with UAV-SfM method providing clues as to the understanding of block slope development *菊池 基1、吉田 英嗣1、小花和 宏之2 (1.明治大学、2.東京大学)