Numerical Heat-conduction Modeling to Understand the Genesis of the Observed Geothermal Gradient in Ulleung Island using Experimentally Determined Thermal Properties of the Rocks

울릉도 산출 암석의 열물성 자료를 이용한 울릉도 지열 성인에 대한 열전도 수치모델링 연구

  • Received : 2016.07.04
  • Accepted : 2016.07.20
  • Published : 2016.08.31


We have numerically modeled thermal evolution of Ulleung Island after an emplacement of magma chamber. The disk-shape magma chamber is assumed to locate at 2.9 km beneath the island and has a diameter and a thickness of 10 km and 300 (or 600) m, respectively. The geothermal gradients evaluated from the numerical modeling coincide well with the range of the geotherms (${\sim}95^{\circ}C/km$) observed from the well logging. Although there are limitations in the application of the numerical results directly to the interpretation of the observed geotherms, we believe that an existence of a hot magma chamber in molten or in solidified state is the most plausible explanation for the observed geotherms.


Ulleung Island;Geotherm;Thermal properties;Magma chamber;Numerical modeling


Supported by : 한국에너지기술평가원


  1. Simute, S., Steptoe, H., Cobden, L., Gokhberg, A., Fichtner, A., 2016, Full-waveform inversion of Japanese Islands region. Journal of Geophysical Research, Solid Earth, 121, doi:10.1002/2016JB012802.
  2. T.J. Lee, Y.H. Song, 2013, Enhanced Geothermal System Case Study: The Soultz Project. Tunnel & Underground Space Vol. 23, No. 6, 561-571.
  3. 김기범, 이기동, 2008, 울릉도의 화산층서와 단층에 대한 연구. 지질공학회지, 18, 321-330.
  4. 홍훈기, 윤건신, 전재수, 김영식, 정성욱, 송윤호, 2014, 울릉도 심부 지열자원 부존 가능성 검토, Proceedings of KSEG 2014 Spring Conference, 419-423.
  5. Arai, F., Oba, T., Kitazato, H., Horibe, Y. and Machida, H., 1981, Late Quaternary tephrochronology and paleooceanography of the sediments of the Japan Sea. Quaternary Research, 20, 209-230.
  6. Crank, J., 1975, The mathematics of diffusion, Clarendon Press, Oxford.
  7. Davies, G. F., 2011, Mantle Convection for Geologist, Cambridge University Press.
  8. Energy Statistics in Iceland 2015, 2015, ed. Baldur Petursson, National Energy Authority, Ministry of Industries and Innovation, Government Offices of Iceland.
  9. KEPRI/KIGAM/Nexgeo./Heesong Geotek/KETEP, 2016, Final report of Assessment of deep geothermal resources for geothermal power generation in Ulleung Island (in Korean).
  10. Kim, Y., Lee, S.-M., Matsubayashi, O., 2010, New heat flow measurements in the Ulleung Basin, East Sea(Sea of Japan): relationship to local BSR depth, and implications for regional heat flow distribution. Geo-Marine Letters, 30, 595-603.
  11. Korea Electric Power Research Institute, 2015, Final report of deep and high-temperature drilling 1st project (in Korean).
  12. Korea Electric Power Research Institute, 2016, Final report of deep and high-temperature drilling 2nd project (in Korean).
  13. Philpotts, A.R., 1980, Principles of igneous and metamorphic petrology, Prentice Hall.