Seungsoon Choi

Education 

• Ph.D. (February 2023) in Earth and Environmental Sciences, Seoul National University, South Korea (advisor: Prof. Haemyeong Jung)

• B.S. (2015) in Earth and Environmental Sciences, Chungbuk National University, South Korea

Employment 

• 2026. 03-present: Assistant Professor,  Department of Earth Science Education, Jeonbuk National University, South Korea

• 2025. 03-2026. 02: Research professor, Institute of Earth·Atmosphere·Astronomy, Yonsei University, South Korea

• 2024. 10-2025. 02: Senior researcher, Research Institute of Basic Sciences, Seoul National University, South Korea

• 2023. 06-2024. 09: Postdoctoral researcher, Research Center of Earth and Environmental Sciences, Korea Basic Science Institute, South Korea

• 2023. 03-05: Postdoctoral researcher, Center for Deep-Surface Coupling of Earth, Seoul National University, South Korea

• 2017-2023: Research Assistant, Dept. Earth and Environmental Sciences, Seoul National University, South Korea

• 2021-2021: Teaching Assistant, Dept. Earth and Environmental Sciences, Seoul National University, South Korea

Research Interest

• Deformation microstructures and mechanisms of minerals and rocks in shear zones and fault zones

• Cataclastic flow and strain localization in experimentally and naturally deformed rocks

• Deformation experiments of lawsonite blueschist at pressures up to 3.0 GPa and temperatures up to 600 °C using a Griggs apparatus (a triaxial piston-cylinder instrument) 

• Seismic velocity and anisotropy of deformed minerals and rocks in subduction zones 

• Microstructural, geochemical, and geochronological records of deformation and recrystallization in zircon and calcite 

• Lawsonite blueschist, epidote blueschist, eclogite, granulite, anorthosite, and other rocks in subduction zones and fault zones

• Electron Backscatter Diffraction, Transmission Electron Microscopy, Raman Spectroscopy, Electron Probe Micro Analyzer, and synchrotron-based X-ray micro-tomography

Awards

• Seonam Prize from the Petrological Society of Korea (2025)

• The First Prize in the Geological Photography Contest in Geological Society of Korea fall meeting (2023)

• The First Prize in the Geological Photography Contest in Geological Society of Korea fall meeting (2022)

• 2020-2021 Best Cover Award Winner from Minerals (2022)

• Outstanding Presentation Award from the Petrological Society of Korea (2021)

Publications

• Choi, S., Kim, T., Jung, H. (2026) Microstructural evidence for ductile deformation of Neoproterozoic stromatolites in Socheong Island, Korea. Journal of Structural Geology (under review)

• Cheong, A.C.S., Choi, S., Yi, K., Lee, S., Jung, H., Jang, J. (2026) Crystallographically coherent metasomatic transformation of zircon in a mid-crustal shear zone. Scientific Reports (under review)

• Choi, S., Cheon, Y., Jung, S., Park, M. (2026) Localized deformation and microstructures of a fault-zone calcite vein: A case study from the northern Yangsan Fault, SE Korea. Korean Journal of Mineralogy and Petrology (in press) 

• Choi, S., Kim, J., Jung, H. (2025) Seismic properties of lawsonite blueschist in cold subduction zones. Tectonophysics, 919, 231028. https://doi.org/10.1016/j.tecto.2025.231028

• Choi, S., Jung, H., Y., Jung, S. (2025) Crystal preferred orientation of lawsonite and glaucophane in lawsonite blueschist deformed in general shear. Journal of Structural Geology, 105464. https://doi.org/10.1016/j.jsg.2025.105464 

• Choi, S., Cheon, Y., Kim, C-M., Jung, H., Park, M. (2024) Deformation microstructures of fault rocks from the northern Yangsan Fault, SE Korea: implications for coseismic and aseismic behavior. Geosciences Journal, 1-14. https://doi.org/10.1007/s12303-024-0014-4 

• Choi, S., Park, Y., Han, S., Jung, S., Fabbri, O., Jung, H. (2024) Deformation microstructures of blueschists in Alpine Corsica, France, and implications for seismic anisotropy and the low-velocity layer in subducting oceanic crust.  Tectonophysics, 877, 230297. https://doi.org/10.1016/j.tecto.2024.230297 

• Choi, S., Yi, K., Jung, H., Cheong, A.C.S. (2024) Microstructural and microchemical analysis of zircon in a syenite lithic fragment from Ulleung Island volcano, South Korea. Journal of Analytical Science and Technology, 15(1), 13. https://doi.org/10.1186/s40543-024-00426-4 

• Choi, S., Fabbri, O., Topuz, G., Okay, A.I., Jung, H. (2021) Twin Induced Reduction of Seismic Anisotropy in Lawsonite Blueschist. Minerals, 11, 399. https://doi.org/10.3390/min11040399

• Cao, Y., Du, J., Park, M., Jung, S., Park, Y., Kim, D., Choi, S., Jung, H., Austrheim, H. (2020) Metastability and non dislocation‐based deformation mechanisms of the Flem eclogite in the Western Gneiss Region, Norway. Journal of Geophysical Research: Solid Earth, 125, e2020JB019375. https://doi.org/10.1029/2020JB019375

Recent Abstracts

• Choi, S., Cheon, Y., Kim, C.-M., Jung, H., and Park, M. (2025) Microstructural insights into the coseismic and aseismic behavior of fault rocks in the northern Yangsan Fault, SE Korea, EGU General Assembly 2025, Vienna, 27 Apr-2 May, Austria. https://doi.org/10.5194/egusphere-egu25-15187.

• Choi, S., Yong, P., Han, S., Jung, S., O. Fabbri, and H. Jung. (2024) Deformation microstructures and seismic properties of blueschists in Alpine Corsica, France: insights into subducting oceanic crust dynamics, A.G.U., Washington, D.C., Dec 9-13, U.S.A. 

• Choi, S., Yong, P., Han, S., Jung, S., O. Fabbri, and H. Jung. (2024) Deformation microstructures of blueschists in Alpine Corsica, France, and implications for seismic properties in subducting oceanic crust, International Geological Congress, Busan, Aug 25-31, South Korea. 

• Choi, S and H. Jung. (2024) Crystal Preferred Orientation of Lawsonite and Glaucophane in Lawsonite Blueschist Deformed Under Simple Shear, Gordon Research Conference, Lewiston, Aug 4-9, U.S.A. 

• Choi, S and H. Jung. (2022) Experimental Study on the Crystal Preferred Orientation (CPO) of Minerals in Lawsonite Blueschist and Implications for Seismic Property in Cold Subduction Zones, A.G.U., Chicago, Dec 12-16, U.S.A. 

• Choi, S., O. Fabbri, G. Topuz, A. I. Okay, and H. Jung. (2021) A study of twin-induced reduction of seismic anisotropy in lawsonite blueschist, A.G.U., New Orleans, Dec 13-17, U.S.A. 

• Choi, S., O. Fabbri, G. Topuz, A. Okay, and H. Jung. (2021) Twin induced attenuation of seismic anisotropy in lawsonite blueschist, E.G.U., Apr 19-30.

• Choi, S and H. Jung. (2019) Experimental Study on the Deformation Microstructures of Lawsonite Blueschist and Implications for Seismic Property, A.G.U., San Francisco, Dec 9-13, U.S.A.

• Choi, S and H. Jung. (2017) Experimental study on the deformation microstructures of lawsonite blueschist and implications for seismic anisotropy, A.G.U., New Orleans, Dec 11-15, U.S.A.

Invited seminar

• April 2025: Pusan National University, Busan, Republic of Korea

           Title: Microstructural Analysis of Crustal Deformation: Continental Fault Zones, Oceanic Crust, and the Record in Zircon

• March 2024: Yonsei University, Seoul, Republic of Korea

 Title: Deformation microstructures of blueschist, zircon, and fault rock using Electron Backscatter Diffraction (EBSD) analysis 

• November 2023: Chungbuk National University, Cheongju, Republic of Korea

 Title: Introduction to deformation microstructures and studies on the application of mylonitic and fault rocks using EBSD 

• November 2023: Seoul National University, Seoul, Republic of Korea

       Title: Africa-Eurasia plate collision and blueschist & eclogite from Corsica Island, France

• August 2023: Korea Basic Science Institute, Cheongju, Republic of Korea

Title: Deformation microstructures of lawsonite blueschist and the study on the application of mylonitic rocks using EBSD

• July 2023: Korea Institute of Geoscience and Mineral Resources, Daejeon, Republic of Korea

Title: Deformation microstructures of lawsonite blueschist and studies on the application of mylonitic and fault rocks using EBSD