Re: [meteorite-list] Crater maker

[Graham Christensen]

I would think that larger meteorites would have a larger ratio of 
crater:impactor size because they have a lower surface area to volume ratio 
so they would impact with a higher final velocity. So to make a crater, I'm 
sure you'd need an impactor much larger than 3 feet as the 10 to 1 ratio 
would suggest, in fact a 3 foot impactor would most likely lose all of its 
cosmic velocity and impact at terminal velocity. Isn't the Hoba meteorite 
something like 9 feet long?

Graham
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Graham Christensen
[EMAIL PROTECTED]
http://www.geocities.com/aerolitehunter
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----- Original Message ----- 
From: "Michael L Blood" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Meteorite List" 
<Meteorite-list@meteoritecentral.com>
Sent: Sunday, March 20, 2005 7:28 PM
Subject: Re: [meteorite-list] Crater maker


Thanks to all who responded.
       Other than the 10 to 1 ratio, I pretty much thought
the same as what most people stated.
       Here is what I did respond with:
--
One "formula" in which I hold very little
belief, is a ratio of 10 times the diameter of the
impactor. This question has far to many variables, such
as speed of meteorite upon contact, type of soil
and composition of meteorite (ie, stone or Iron),
angle of trajectory, etc. In addition, the K-T event
produced a crater (as indicated by hypercompacted
quartz) with a diameter of 500 miles - but the impactor
is estimated at "only" 6 miles in diameter - the ol' 10
to one ratio implies there should have "only" been a crater
60 miles in diameter.
       Best wishes, Michael
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