Abstract
This paper summarizes liquefaction-induced damage in the Tohoku region during the Mw 9.0 destructive earthquake that occurred March 11, 2011, focusing on land and geomorphologic conditions of affected areas.Based on this study the following conclusions were reached: liquefaction was observed at a total of 63 cities, towns and villages in all six prefectures in Tohoku regions, whose numbers of 7.5-arc-second grid cells are 561; most of the liquefaction occurred in the areas where the instrumental seismic intensity exceeded 5.0; liquefaction caused damage to road, levees and residential houses, the lifelines as well as farmlands; liquefaction took placed in paddy field and mulberry plantation along the meandering rivers and valleys between terraces and hills during the Meiji and Taisho eras; and liquefaction occurrence rate for each geomorphologic unit within the areas of the instrumental seismic intensity exceeded 5.0 is the highest for natural levee (6.6%) among 22 geomorphologic classification units; the rate for reclaimed land and filled land is fairly low, which correspond to less than 1%, respectively.
