Affiliation: | (1) Laboratory of Geothermics, Department of Earth Resources Engineering, Kyushu University, Fukuoka 812-8581, Japan;(2) Department of Applied Geophysics, University of Mining & Geology St. Iv. Rilski , Sofia, 1700, Bulgaria;(3) Department of Electromechanical Engineering, University of Burgos, Burgos, 09006, Spain |