[meteorite-list] Tunguska rates

[The Tricottet Collection]

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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