Thermal response tests with U-tube ground heat exchanger of 50 m long were conducted to evaluate apparent thermal conductivity in 23 locations of Aomori Prefecture. The apparent thermal conductivities were ranged from 1.12 to 2.94 W/(mK). The highest apparent thermal conductivity was evaluated in the location consisted of gravel layer. The lowest value was in the location consisted of alternation of mudstone and sandstone. In addition, the apparent thermal conductivities were ranged from 1.50 to 2.08 W/(mK) in the alluvial plain deposits of Aseishi river.
