JOGMEC, or Japan Oil, Gas and Metals National Corporation, will investigate 1,050 square kilometers of two areas in Tohoku up from the sky to find potential sites for geothermal power plant.
A measurement equipment "Electromagnetic Loop" suspended by helicopter enables to investigate electric composition under the ground, that helps to find hot water and steam 500 meters at maximum down in earth.
http://www.itmedia.co.jp/smartjapan/articles/1506/12/news040.html
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