Hi Arnauld, all,
The problem is that Tunguska type blasts have been occuring recently (for the
last 5,000 years) at a rate of 1 per 100 years, not 1 per 1,000. Whether this
represents a short term phenonmenon or the long term rate is not currently
known.
I used to put together catalogues of "known and suspected impacts", you may
want to google that, and if you have not bought a copy of "Man and Impact in
the Americas" yet, well, it is the best available recent impact rate data for
the Americas.
E.P. Grondine
Man and Impact in the Americas
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