심부 지열자원 부존 가능성 탐지를 위한 제주 중산간 지역의 2차원 MT 탐사
Two-dimensional magnetotelluric surveys for investigating possible deep geothermal regime in the mid-mountain area of Jeju Island
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Two-dimensional magnetotelluric (MT) and audio-frequency MT (AMT) surveys have been carried out at the mid-mountain area of Jeju Island to figure out any possible structures or evidences for remnant deep geothermal energy. Though numerous drillings have been performed in Jeju Island for development of ground water, the wells are mostly located along the coast lines or at low altitude area, but can hardly be found on the mid-mountain area. Good quality of MT and AMT data could be earned by operating far-remote reference in Kyushu Island, Japan, which is approximately 480 km apart. Two-dimensional inversion of MT data for four survey lines surrounding the Halla mountain showed a thick layer having around 10 ohm-m in the depth of a few hundred meters throughout the survey area, which can be considered as the unconsolidated sedimentary layer and the marine originated sedimentary layer. They also showed a conductive anomaly extending to more than 2 km depth at the central part of each survey line, which can possibly be a hydrothermal system or clays related with old volcanic activities during the formation of Mt. Halla.
Abstract
Two-dimensional magnetotelluric (MT) and audio-frequency MT (AMT) surveys have been carried out at the mid-mountain area of Jeju Island to figure out any possible structures or evidences for remnant deep geothermal energy. Though numerous drillings have been performed in Jeju Island for development of ground water, the wells are mostly located along the coast lines or at low altitude area, but can hardly be found on the mid-mountain area. Good quality of MT and AMT data could be earned by operating far-remote reference in Kyushu Island, Japan, which is approximately 480 km apart. Two-dimensional inversion of MT data for four survey lines surrounding the Halla mountain showed a thick layer having around 10 ohm-m in the depth of a few hundred meters throughout the survey area, which can be considered as the unconsolidated sedimentary layer and the marine originated sedimentary layer. They also showed a conductive anomaly extending to more than 2 km depth at the central part of each survey line, which can possibly be a hydrothermal system or clays related with old volcanic activities during the formation of Mt. Halla.
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