For the study of a landslide that occurred at Hachimantai Sumikawa, Akita Prefecture, an airborne electromagnetic survey is conducted for the examination of the relationship between the spot of landslide and solfataric clay (bluish gray clay). The location is a cap block type structure with a Neogene green tuff overlain by accumulated lava flow, where hot water is very active. The system used in this study is capable of measurement across a very wide frequency range, and measurements are made simultaneously at five frequencies of 220Hz, 1100Hz, 5500Hz, 27,500Hz, and 137,500Hz, these frequencies meaning depth levels 5m-70m explored. It is found that the spot of landslide matches a region where resistivity is so low as to be not higher than 10ohm/m. It is also found, in the resistivity cross section analysis for the middle part of the spot of landslide, that the mass of soil that moved on the upper part of the spot is relatively high in resistivity while the part below the slide surface is low in resistivity. There is agreement between the results reported above and the results of on-site investigations. 4 refs., 6 figs.