Abstract
Magnetic susceptibility measurements of the drilled cores and the tunnel wall which consists of Neogene sedimentary rocks were made at the Rokkasyo village, Simokita Peninsula, Japan. Tuff, Sandstone, Mudstone of the Neogene Takahoko formation distributing in this area are slightly deformed and displaced by the submarine sliding before consolidation. The Takahoko formation has neither key layers nor geological distinctions for the strata correlation, but it has a pattern characterized by the magnetic susceptibility. The geological structure, the geological discontinuity and the oxidation front in the Takahoko formation can be distinguished through the magnetic susceptibility measurements.
