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Self introduction & contact information

• Name: Kohei Hotta
• Field: Solid earth physics
• Speciality: Physical volcanology, geodesy
• Affiliation: Department of Earth System Science, Faculty of Sustainable Design, University of Toyama
• Position: Assistant Professor
• Address: 3190 Gofuku, Toyama 930-8555, Japan
• Office: A327, School of Science Bldg. 1
• Telephone: +81-76445-6555 (direct number)
• Fax: +81-76445-6549 (General Affairs Division, School of Science)
• E-mail:
• Birthday: July 1, 1987
• Hometown: Kagoshima (born in Kyoto)
• Hobby: Taking photos of landscapes, drawing pictures, and occasionally composing

Current research

• Geodetic sudies on Tateyama volcano
• Seismological studies in and around Tateyama volcano
• Geodetic studies on Sakurajima volcano
• Study on the relationship between the annual variation of GNSS and snow depth
• Study on the effects of the Noto Peninsula Earthquake on Murono mud volcano

Brief curriculum vitae

• April 2003-March 2006: Kagoshima Prefectural Tsurumaru Senior High School
• April 2007-March 2011: Faculty of Science, Kyoto University
• April 2011-March 2013: Division of Earth and Planetary Science, Graduate School of Science, Kyoto University (Master course)
  • Master's thesis: Study of magma accumulation and supply processes based on ground deformation at Sakurajima volcano from 1998 to 2005
• April 2013-March 2016: Division of Earth and Planetary Science, Graduate School of Science, Kyoto University (Doctor course)
  • Doctoral thesis: Style and process of magma intrusion based on combined ground deformation data in and around Sakurajima volcano, southern Kyushu, Japan
• April 2016-March 2018: Program-Specific Researcher, Research Prevention Research Institute, Kyoto University
• April 2018-current: Assistant Professor, Department of Earth System Science, Faculty of Sustainable Design, University of Toyama

Academic affiliations

• February 2013-current: Japan Geoscience Union
• May 2013-current: Volcanological Society of Japan
• September 2018-current: Geodetic Society of Japan
• July 2014-current: American Geophysical Union

Awards

• May 2018: Volcanological Society of Japan Young Scientist Award (No. 26)

Journal papers (peer reviewed)

1. K. Hotta (2025) Ground deformation in and around Jigokudani valley, Tateyama volcano, Japan, during the period of 2021–2022 revealed from combined data of leveling surveys and GNSS observations. Earth, Planets and Space, 77, 47, doi:10.1186/s40623-025-02152-6.
2. K. Hotta, K. Hisashi, H. Sakai, T. Hamano, D. Taki, T. Tanaka (2024) Vertical Displacement of the Murono Mud Volcano, Niigata Prefecture, Japan, Caused by the 2024 Noto Peninsula Earthquake. Journal of the Geodetic Society of Japan, 70, 166-172, doi:10.11366/sokuchi.70.166 (in Japanese with English abstract).
3. K. Hotta, H. Takahashi, Y. Honda, T. Kenmochi (2023) Re-uplift of Jigokudani, Tateyama Volcano, Revealed from Leveling Survey―September 2020‒September 2021―. Bulletin of Volcanological Society of Japan, 68(2), 83-89, doi:10.18940/kazan.68.2_83 (in Japanese with English Abstract).
4. K. Hotta, S. Kusumoto, H. Takahashi, Y.S. Hayakawa (2022) Deformation source revealed from leveling survey in Jigokudani valley, Tateyama volcano, Japan. Earth, Planets and Space, 74, 32, doi:10.1186/s40623-022-01593-7.
5. K. Hotta, M. Iguchi (2021) Tilt and strain change during the explosion at Minami dake, Sakurajima, on November 13, 2017. Earth, Planets and Space, 73, 70, doi:10.1186/s40623-021-01392-6.
6. K. Hotta (2019) Study on Magma Accumulation and Migration Based on Combined Ground Deformation Data in and around Sakurajima Volcano. Bulletin of Volcanological Society of Japan, 64(3), 175-182, doi:10.18940/kazan.64.3_175 (in Japanese).
7. K. Hotta, M. Iguchi, T. Ohkura, M. Hendrasto, H. Gunawan, U. Rosadi, E. Kriswati (2019) Magma intrusion and effusion at Sinabung volcano, Indonesia, from 2013 to 2016, as revealed by continuous GPS observation. Journal of Volcanology and Geothermal Research, 382, 173-183, doi:10.1016/j.jvolgeores.2017.12.015.
8. K. Hotta, M. Iguchi, T. Ohkura, M. Hendrasto, H. Gunawan, U. Rosadi, E. Kriswati (2018) Method for estimating the end of the deflation initiated in 2014 at Sinabung volcano, Indonesia, under the assumption that the magma behaves as a Bingham fluid. Earth, Planets and Space, 70, 107, doi:10.1186/s40623-018-0884-7.
9. N. Aisyah, M. Iguchi, Subandriyo, A. Budisantoso, K. Hotta, S. Sumarti (2018) Combination of a pressure source and block movement for ground deformation analysis at Merapi volcano prior to the eruptions in 2006 and 2010. Journal of Volcanology and Geothermal Research, doi:10.1016/j.jvolgeores.2018.05.001.
10. K. Hotta, M. Iguchi (2017) Ground deformation source model at Kuchinoerabu-jima volcano during 2006–2014 as revealed by campaign GPS observation. Earth, Planets and Space, 69, 173, doi:10.1186/s40623-017-0763-7.
11. K. Hotta, M. Iguchi, T. Tameguri (2016) Rapid dike intrusion into Sakurajima volcano on August 15, 2015, as detected by multi-parameter ground deformation observations. Earth, Planets and Space, 68, 68, doi:10.1186/s40623-016-0450-0.
12. K. Hotta, M. Iguchi, T. Ohkura, K. Yamamoto (2016) Multiple-pressure-source model for ground inflation during the period of high explosivity at Sakurajima volcano, Japan ‒ Combination analysis of continuous GNSS, tilt and strain data ‒. Journal of Volcanology and Geothermal Research, 310, 12-25, doi:10.1016/j.jvolgeores.2015.11.017.

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