Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

S (Solid Earth Sciences) » S-VC Volcanology

[S-VC43] Volcanic and igneous activities, and these long-term forecasting

Sun. May 20, 2018 1:45 PM - 3:15 PM A05 (Tokyo Bay Makuhari Hall)

convener:Teruki Oikawa(GSJ, National Institute of Advanced Industrial Science and Technology), Takeshi Hasegawa(Department of Earth Sciences, College of Science, Ibaraki University), Daisuke MIURA(一般財団法人 電力中央研究所 地球工学研究所 地圏科学領域, 共同), Nobuo Geshi(Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology), Chairperson:Geshi Nobuo(GSJ/AIST), Oikawa Teruki

1:45 PM - 2:00 PM

[SVC43-11] Holocene eruption history of Norikura Volcano, central Japan.

*Teruki Oikawa1, Shun Nakano1, Kenichi Arai2, Keisuke Nakamura2, Koji Fujita2, Shino Naruke2, Kishimoto Hiroshi2, Tatsuro Chiba2, Shohei Nanri3 (1.GSJ, National Institute of Advanced Industrial Science and Technology , 2.Asia Air Survey Co., Ltd., 3.Faculty of Urban Environmental Sciences, Tokyo Metropolitan University)

Keywords:volcanic eruption, tephra, active volcano, phreatic eruption, magmatic eruption, Hida Mountain Range

Norikura volcano is an active volcano located at the southern part of the North Japan Alps (Hida Mountain Range). We re-constructed of the volcanic history of the volcano in Holocene, based on the tephra stratigraphy and AMS radiocarbon dating. This survey was conducted by the Norikura Dake Volcanoic Disaster Prevention Council.
As a result, we distinguished two magmatic tephra eruptions and ten phreatic eruptions in Holocene. The tow magmatic tephra layers consist of scoria fall deposit with pyroclastic deposit and ash fall deposits, respectively. The latest eruption in the volcano is a phreatic eruption ca. 500 years ago. All the eruptions occurred from the craters around the Kengamine Peak.
The eruption frequency of the last 7,300 years is ca. 800 years / times, which is lower than the neighboring Yakedake volcano (ca. 300-100 years/times).