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Just Richter 5.0 or greater
events in the last 40 years. We
note in passing that the city of
Osaka is a demographer's
nightmare: it goes from 2.6
million people at night to 3.7
million during the day.  
Of interest to those passionate
about turbulence and
hydrodynamics are our results
that for many tsunamis the
direction of the Naruto
whirlpool will be reversed AND
the flow of the Yodo River
(roughly southwest from the
orange dot at the top right) will
be reversed as well.