Seismic Damages to Geo-structures in the Southern District of Miyagi Prefecture during the 2011 off the Pacific coast of Tohoku Earthquake

Abstract

The seismic damages to geo-structures in the southern district of Miyagi prefecture during the 2011 off the Pacific coast of Tohoku Earthquake were discussed in this paper. The damages to hillside embankments and river embankments were discussed in some detail, in which the role of high degree of saturation of soils was emphasized. The subsidence of ground due to both the tectonic movement occurred during the earthquake and the consolidation of clayey soils weakened by seismic loadings was briefly discussed. The hazard to the foundations of buildings owing to the tsunami propagation was also discussed with paying attention to scour and liquefaction.