Implications of the temperature dependence of a shallow alteration layer for phreatic eruption: Insights from the electrical resistivity structure beneath Zao Volcano, NE Japan

Masahiro Ichiki

Presentation information

[E] Oral

S (Solid Earth Sciences ) » S-VC Volcanology

[S-VC40] S-VC40 [E] Volcanic eruption dynamics and mechanisms: controlling physical and chemical processes (Keiko Matsumoto)

Wed. May 27, 2026 9:00 AM - 10:30 AM International Conference Room (IC) (International Conference Hall, Makuhari Messe)

Chairperson:Matsumoto Keiko(Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology), Muramatsu Dan(Institute of Seismology and Volcanology, Faculty of Science, Hokkaido University), Tsunematsu Kae(Yamagata University)

10:00 AM - 10:15 AM

[SVC40-05] Implications of the temperature dependence of a shallow alteration layer for phreatic eruption: Insights from the electrical resistivity structure beneath Zao Volcano, NE Japan

*Masahiro Ichiki¹, Wataru Kanda², Toshiki Kaida¹, Masashi Ushioda^2,3, Kaori Seki^2,4, Yasuo Ogawa^1,2, Satoshi Miura¹, Mare Yamamoto¹, Yuichi Morita^5,6, Makoto Uyeshima⁵ (1. Graduate School of Science, Tohoku University, 2. Institute of Integrated Research, Institute of Science Tokyo, 3. Department of Civil Engineering, Shikoku Reseach Institute Inc., 4. Meteorological Research Institute, Japan Meteorological Agency, 5. Earthquake Research Institute, The University of Tokyo, 6. Center for Volcano Research Promotion, National Research Institute for Earth Science and Disaster Resilience)

Keywords:phreatic eruption, electrical resistivity, smectite, impermeable layer, hydrothermal fluids, Zao volcano