Abstract
The surveys using the high-frequency CSMT system were carried out to make clear the electrical conductivity structures in the landslide area in Izumi and in the test-field of Shirasu banks in Satuma-sendai. Although the survey in Izumi was conducted along a short line in a narrow flat area, relatively good data were obtained because of the short span of electrodes in this system. The 2-D resistivity model indicates that a high-conductive layer possibly highly satisfied with water lies just upon impermeable tuff breccia. Beneath the test-field of Shirasu banks, it is found that the deep layers on March are rather dry than those on January after rainfall test. These results indicate that the high-frequency CSMT method is relatively effective to survey shallow subsurface structures.
