Abstract
This paper describes process and result of examination that was carried out to verify seismic resistance of seawalls and cut-off structures to level 2 earthquake motions. Two-dimentional effective stress analysis code named "FLIP"was employed for the verification of following two cases;
1. Double cut-off geomembrain sheets in caisson type seawall.
2. Steel sheet piles in rubble mound type seawall.
It was found that cut-off geomembrain sheets were not broken in the former type of seawall by using "FLIP"only, however a corner in the latter type of seawall had structural weakness by using total stress analysis code named "ALID"after using "FLIP".
To take countermeasures based upon the verification results is necessary for reducing environmental risks by continuous monitoring on leakage.
