The 90th(Spring of fiscal 1994) SEGJ Conference was held in Tokyo during May 25-27, and a total of 120 papers were reported. As for bore hole survey, presented were behavior of a subsurface fracture reopening by crosshole triaxial seismic measurement and sonic log, analysis of fractures along a borehole axis at a geothermal well, etc. As to seismic tomography, reports were made on fracture characterization in volcanic regions - technology development on seismic tomography, seismic traveltime tomography in anisotropic media, etc. Concerning hypocenter/survey systems, the following were reported: ability of a new seismic source `Seismic Shotpipe,` development of a new type receiving system for seismic prospecting in shallow layer, etc. In addition, a lot of papers were presented on ground vibration, tsunami disasters, temperature/reservoir, resistivity survey theory, electric/electromagnetic survey case study, MT method case study, archaeological prospecting/GPR, reflection method data processing, etc.