Physical properties of clay from landslides in large fracture zones

Clay from the Izumi Group, which had been exposed to landslides arising from large-scale motion of the Median Tectonic Line, was found to contain chlorite in contrast to clays not exposed to landslides. Furthermore, ϕ′ and ϕr values from clay in the fracture zones were found to be 10 degrees lower than those elsewhere in the Izumi Group except in the clay that slid, which instead had values 15 degrees lower.