Kim, H.C.; Baek, S.K., and Hwang, J.H., 2019. GIS analysis and evaluation on the geothermal reserves of the costal area of Jeju island and Ulleung island, volcanic islands in South Korea. In: Jung, H.-S.; Lee, S.; Ryu, J.-H., and Cui, T. (eds.), Advances in Remote Sensing and Geoscience Information Systems of Coastal Environments. Journal of Coastal Research, Special Issue No. 90, pp. 377-385. Coconut Creek (Florida), ISSN 0749-0208.
South Korea has the greatest growth in greenhouse gas (GHG) emissions among Organization for Economic Cooperation and Development countries. To reduce emissions through voluntary GHG reduction measures, at the 21st Summit of the Conference on Climate Change in France, geothermal energy was selected as a key technology for the achievement of 50 % reduction in national GHG emissions by 2020. To meet this challenge, selection of the most suitable (reasonable and efficient) geothermal energy development site is necessary. The development of economical geothermal power through the efficient execution of the state budget for future geothermal energy development is also necessary. In other countries, geothermal power is being developed using the heat around active volcanoes. In Korea, geothermal abnormalities are related mostly to the geothermal heat produced by the radioactive decay of elements. The research area selected for this study comprised Korea's representative volcanic islands, Jeju Island and Ulleung Island. The geothermal investigation on Jeju Island was assessed through several boreholes, revealing generally lesser heat flow than that of inland of South Korea. On the other hand, a high temperature gradient was found through recent drilling on Ulleung Island. To determine the cause of this high gradient, rock thermal properties and borehole irradiation data from the coastal areas of Jeju and Ulleung islands were compared. It need to be calculated the geothermal reserve and constructed geothermal parameter maps of the volcanic Jeju and Ulleung islands in South Korea for regional analysis and evaluation. As a result, the average thermal conductivity of rocks is 1.69 W/mK (Ulleung) and 1.76 W/mK (Jeju), lower than inland. In the case of geothermal gradient, heat flow, and heat production rate, Ulleung island is average 86.55 °C/km, 127.06 mW/m2, 3.75 µW/m3 and Jeju island is average 24.65 °C/km, 40.13 mW/m2, 0.76 µWm3. It is the value significantly higher Ulleung island than inland, but Jeju island is lower than inland. It seems to be the reason related to the occurrence origin of the volcanic island.