Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
Date (from‐to) : 2015/06 -2016/03
Author : Iguchi Masato, KANDA Wataru, MORI Toshiya, GESHI Nobuo, TANAKA Hiroshi, SEKIYA Naoya, KURI Miwa, SAKAMOTO Mayumi, HASHIMOTO Manabu, NAKAO Shigeru, Ohminato Takao, MAKI Norio, ICHIKO Taro, YAMADA Takashi, JITOZONO Takashi, TANADA Toshikazu, TAMEGURI Takeshi, NAKAMICHI Haruhisa, SUZUKI Yujoro, TAKARADA Shinji, MIKI Daisuke, NAKADA Setsuya, KOBAYASHI Tetsuo, YAMAMOTO Keigo, SHINOHARA Hiroshi, NOGAMI Kenji, OZAWA Taku, MIWA Takahiro, NAGAI Masashi, KOYAMA Takao, OHKURA Takahiro
Discharge rate of volcanic gas, ground inflation, seismicity and geothermal activity successively increased prior to the eruption on May 29, 2015. Degassing and crystallization of magma proceeded at a shallow part beneath the crater. Explosion earthquake of 2014 eruption was larger than 2015 eruption, however eruption volume and intensity of eruption in 2015 was larger. Evacuation experience in 2014 eruption took an important role for evacuation planning and evacuation operation in 2015 eruption. No phenomena to show increase in volcanic activity were detected by instruments installed after the eruption in this project. Evaluation of activity by this project is useful to reduction of restricted zone and decision making for returning.