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Recent Richter 4.0 or
greater events. We
would be reluctant to
unilaterally define a
northern limit to the
Channel (and possibly
exclude the three
marine events at
around 53 degrees
north), especially as
any major marine
earthquake even north
of 55 degrees would
certainly send
tsunamis racing down
the Channel. In any
case, there are three
additional events all
larger than 3.9