TSUNAMI DAMAGE ASSESSMENT ON ROAD STRUCTURES IN THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE

Abstract

 Damage on road structures due to the 2011 off the Pacific coast of Tohoku earthquake and tsunami is assessed based on the data provided by related Regional Development Bureaus, expressway sectors and local government sectors. We define two damage ratios R_L^r, R_N^b as the value of number of road damage points devided by total road length[km] and that of number of bridge damage points devided by total number of bridges subjected to the tsunami. Maximum value of R_L^r is 2.12[point/km] at Otanigawa Ishinomaki City, Miyagi Prefecture and Yagawahama Ishinomaki City, Miyagi Prefecture, and that of R_N^b is 1.0 at Minami-sanriku Town, Miyagi Prefecture(Utatsu Long-bridge).