1. Geshi, N., Kobayashi, T., 2007, Geological map of Kuchinoerabujima volcano, Geological Survey of Japan, AIST.
2. Hakone Tourist Agency, Hakone-town, 2016, First Volcano Hot Spring Tourism Summit 2016 in Hakone, https://www.hakone.or.jp/2720?gana=event
3. Hayakawa,Y., 2003, Immediately publish recorded Usu 2000 eruption and risk management on the Internet home page, Bulletin of Gunma University Faculty of Education, Natural Sciences Edition, 51,pp.87-101.
4. Hiroi, O., H. Nakamori, N. Kawabata, Y. Goto, 1992, Prediction and coverage of the volcano eruption: A case study of the1986 Izu-Oshima eruption and the 1991 Unzen eruption, Institute of Socio- Information and Communication Studies, University of Tokyo, p. 153.
5. Japan Meteorological Agency, 2014b, Improvement of volcanic information for mountaineers, http://www.jma.go.jp/jma/press/1410/10a/20141010_kazan_tozansya_joho.html