Shouldn’t Tokyo be a priority for sea walls?

Driving up 150km of coastline in north east Japan I was struck by the number of concrete bollards under construction. Hundreds of thousands of these Tetris shaped objects ready to be stacked on the shore line to protect from another tsunami. Huge steel molds are filled with wet concrete with the end result a several tonne block. Which begs the question. Many are expecting Tokyo to be hit with a monster quake given the last big quake was Sep 1,1923. Surely the cost of building a sea wall and bigger fortifications off Tokyo makes sense.

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