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Historical Richter 6.0 or
greater events. The first
problem is that statistically
there are not enough powerful
earthquakes. That can be
interpreted as increasing the
likelihood of a powerful event
in the future. As can be seen
on the next page, the burst of
activity in the middle of the
20th century was unwelcome -
there were a great deal more
Japanese lives and property
compared to the situation  
when the earliest known
Richter 8.3 struck in 648 AD.
The population of Japan was
73 million in 1940; 84 million
in 1950 and 127 million in