Japan has a type of civil defense system just for tsunami watching. They have also built a system of sea walls to help slow waves if tsunamis occur.
The photos I posted merely touch on the damage and chaos.
Praying for the victims and their families.
Washington State down to Northern California has marked tsunami evac routes and practice evacuations of schools and such. Hawaii and Alaska of course have a system.
However there's some evidence that there's a local tsunami danger in Southern California......but not much has been done to set up any warning system there.