(meteorobs) More on the Norwegian meteorite

[Ken]

I don't see anything in the photograph that distinguishes this site from many other landslides I have seen. A more specific term for this is "rock fall", typically caused by expansion of water as it freezes in fractures in a rock slope, a common occurrence on a rock slope in a cold climate (or seismic shaking in a warm climate). We need to see the debris to look for impact evidence. This is the scar where the debris was.
   
  One way to distinguish impact from typical rock fall might be in the distribution of the debris. Is it straight down the gravity gradient, as in common rock fall, or is it deflected, as by the force of an impactor?
   
  Ken (engineering geologist, Klamath Mountains)

Marco Langbroek <marco.langbroek at wanadoo.nl> wrote:
  Armando, I don't think this is the impact site at all. To me (as to a number of 
others who have commented here on meteorobs and on the met-central list), it 
looks like a landslide, not like an explosion crater or impact pit.

- Marco

Armando Afonso wrote:
> That has the look of a percussion mark, to me.
> The shape is elipsoidal, the internal part is fractured, the envolving rock
> seams, by contrast, healty.
> It would be a strange rockslide.
> Even if the scale of the scar is dificult to evaluate from the photo, a 
> mass
> of an average car falling at the final speed of a meteorite, would not let
> more evidence on a granite surface than this, I think.
> Big craters form when cosmic speed is maintained, with asteroid sized
> bodies, but why are we expecting such a big thing?
> AA
> 
> ----- Original Message ----- From: "David Entwistle" 
> 
> To: "Global Meteor Observing Forum" 
> Sent: Tuesday, June 13, 2006 7:18 AM
> Subject: (meteorobs) More on the Norwegian meteorite
> 
> 
>> Aftenposten are now reporting that the impact site has been found...
>>
>> http://www.aftenposten.no/english/local/article1348689.ece
>> -- 
>> David Entwistle
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-- 

-----
Dr Marco Langbroek
Dutch Meteor Society (DMS)

e-mail: meteorites at dmsweb.org
private website http://home.wanadoo.nl/marco.langbroek
DMS website http://www.dmsweb.org
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