New Energy and Industrial Technology Development Orga n i za t i o n (NEDO) did "Geothermal Development Promotion Survey" in the Hachijojima Island which is a volcanic island with 70km2 located in the Izu-Mariana Island Arc. In that national project, NEDO drilled 8 wells in the field and the maximum temperature of the field was 317OC at 1200111 depth of a well. Of these survey NEDO confirmed the existence of geothermal reservoir,and using a well named HJ-5, NEDO did short time discharge test. The authors calculated borehole temperature and pressure under production the of the well in comparison with the measured data. The authors also calculated productive performance of another well named HJ-8.

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