[meteorite-list] Tunguska rates

From: The Tricottet Collection <tricottetcoll_at_meteoritecentral.com>
Date: Sun, 15 Nov 2009 09:01:36 +0000
Message-ID: <BLU117-W200173BD8062A5CB5C8F00DDA60_at_phx.gbl>

Hi E.P. et al.,

actually, what the journalist of BI wrote is inaccurate. You can read in our report that we used 1 per 1000 years as our preferred value, following the most up-to-date frequency-size distribution [Brown et al, 2002], but we also tested 1 per 200 years [Shoemaker, 1983] and noted that the rate could be far higher if hypotheses from geomythology and related were to be verified.

Best,

ArnaudM



> Date: Sat, 14 Nov 2009 18:20:11 -0800
> From: epgrondine at yahoo.com
> To: meteorite-list at meteoritecentral.com
> Subject: [meteorite-list] Tunguska rates
>
> 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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Received on Sun 15 Nov 2009 04:01:36 AM PST