The 2011 off the Pacific coast of Tohoku Earthquake (M9.0) occurred at 14:36, March 11, 2011. This main shock and series of aftershock gave destructive damage to large area from Aomori Pref. to Shizuoka Pref. in Japan. The most sensational damage was given by Tsunami at the coastal area from Aomori Pref. to Chiba Pref. while many landslides occurred and gave damages at Fukushima, Tochigi, and Ibaraki Pref.. This paper reports the results of field survey of landslides occurred at Shirakawa, Fukushima Pref. and Nasukarasuyama, Tochigi Pref.. In this area, the surface of hillside is covered with pyroclastic deposits from Mt.Nasu, so that many of the landslides occurred at the layer of pyroclastic deposits. Slip surfaces of Landslides observed at this survey were located within the pumice or loam layer. These landslides were characterized by long distance of landslide mass movement. The long distance movement of landslide mass is supposed to be due to generation of excess pore water pressure at the slip surface, although rainfall amount at January to March is relatively small. The mechanism of the generation of excess pore water should be examined.

Key words�FThe 2011 off the Pacific coast of Tohoku Earthquake, landslide, pumice tuff, excess pore water pressure