ov ar ▁Island ▁in ▁southern ▁Ker ala , ▁India . ▁ ▁United ▁States ▁ ▁In ▁the ▁United ▁States , ▁there ▁is ▁a ▁recognized ▁lack ▁of ▁t sun ami - proof ▁design ▁especially ▁in ▁vital ▁install ations ▁such ▁as ▁ag ing ▁nuclear ▁react ors ▁in ▁vulner able ▁regions . ▁For ▁instance , ▁the ▁Un ified ▁Building ▁Code ▁of ▁California ▁does ▁not ▁have ▁any ▁provision ▁about ▁design ing ▁for ▁t sun am is . ▁There ▁are ▁few ▁states , ▁such ▁as ▁Hawai i , ▁that ▁began ▁incorpor ating ▁t sun ami - proof ▁design ▁within ▁its ▁building ▁code . ▁Some ▁exper ts , ▁however , ▁doubt ▁the ▁effic acy ▁of ▁the ▁t sun ami - proof ▁buildings , ▁arg uing ▁that ▁the ▁force ▁of ▁the ▁t sun ami ▁is ▁unknown ▁and ▁that ▁the ▁impact ▁is ▁often ▁so ▁great ▁that ▁special ized ▁building ▁elements ▁would ▁be ▁rendered ▁in effect ual . ▁ ▁T sun ami - proof ▁buildings ▁in ▁Japan ▁ ▁There ▁are ▁important ▁facilities ▁in ▁Japan , ▁which ▁is ▁often ▁in und ated ▁with ▁t sun am is , ▁that ▁feature ▁t sun ami - proof ▁design . ▁The ▁H ama oka ▁N uc lear ▁Power ▁Plant ▁has ▁a ▁bar rier ▁wall ▁designed ▁to ▁protect ▁the ▁facility ▁from ▁t sun ami ▁wave ▁caused ▁by ▁an ▁earth qu ake ▁predicted ▁along ▁the ▁N ank ai ▁Sea ▁tr ough . ▁The ▁bar rier ▁itself ▁is ▁made ▁of ▁continuous ▁steel ▁pip es ▁and ▁steel ▁box ▁frames . ▁In ▁other ▁Japanese ▁nuclear ▁facilities , ▁t sun ami ▁proof ing