[meteorite-list] Falls ON or trough ice...

From: Pekka Savolainen <pekka.savolainen_at_meteoritecentral.com>
Date: Thu Apr 22 10:25:38 2004
Message-ID: <3EBFF7C8.30206_at_dlc.fi>

Hello, Bjorn and the list,

well, you have made a big job, Bjorn, thank you for that.

Bjørn Sørheim wrote:

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>I did a fairly extensive search of falls on ice...
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>There is also the Atwater, MN, USA 17/1 1999 case...
>
Yes, I have noticed, and I also aggree, this may be a meteorite

>
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>Getting more information on falls through ice may make it much
>easier to distinguish ice-impacts features from just
>melting holes or other ice-phenomena. There seems to be many
>such misinterpretated cases, but without good knowledge, the
>misinterpretation may go in both directions, I'm afraid...
>

This is true, we had a potential fall here in February (nothing found
yet), and I suppose, we
recived some 100 - 150 phonecalls about the holes on ice. That´s why I´m
now planning to
get some pictures of different type holes on a web-site, natural melting
holes, holes made by
animals, holes made by fishers etc.. But it seems tobe a bit difficult
to have a real meteorite-hole pic...;-
Anyway, we have tried to check all at least slightly possible ones. It
wouldn´t be very nice to
loss the real-one.

>
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>Also looking at the list above, both the US and Russia is missing,
>quitet strange, I think, especially Russia. Maybe Russia is just
>*very* flat, and Siberia to cold to venture outside in winter :-)?
>
Well, it´s some times quite hard to get good information about russian
falls, big country, cold
winters and not very widely populated areas in Siberia, perhaps these
are some reasons...
Anyway, it would make sence to me, these cases would have happened also
in the northern parts
of the US and also in Canada. But if we think about Takish Lake, it was
quite near, all material was lost.
And this fall was cathed on the film, but was firstly found by the
bush-pilot...

>
>
>I don't assert that the list is complete, some case(s) might have
>slipped through my fingers, maybe. Any suggestions?
>
I´m trying to get information from some different sources, and sure let
you know, if something
will be found. By the way, it seems, Luotolax has wrong coordinates in
quite many lists / books,
more will be found from Jarmo Moilanen´s site;

http://www.netppl.fi/~jarmom/geo/met/mluoto_e.htm

>
>
>Why are you so certain that the last hole in northern Finland was not
>a meteorite, you know that the top layers of bedrock are bent backwards
>in large meteorite craters, e.g. Meteor Crater.
>
Well, there were in fact 2 layers of ice on the area, and in the hole
only the week upper layer was broken,
the steel-ice layer on the bottom was intact. Also it could be seen, the
pressure had come under the ice,
and when there was no fragments between the layers or on the upper ice,
it looked sure to me, this hole
was made by flowing water between the layers. This was lately been
proven by photographes taken from
the plane over the area; in these pics it can be clearly seen, how the
water flows between the layers from
the fell "Halti" nearby.

Anyway, I strongly belive, there should be more of these "fall on the
ice"-cases in northern areas with a lot
of lakes or nearby frozen sea. One reason these will be never found sure
is the slightly populated areas in
the north. The big one on Greenland is still missing...;-

thank you and best regards,

pekka

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-- 
Pekka Savolainen
Jokiharjuntie 4
FIN-71330 Rasala
FINLAND
+ 358 400 818 912
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Received on Mon 12 May 2003 03:36:40 PM PDT