[meteorite-list] Re: KOFELSITE

From: Ing. Christian ANGER <christian.anger_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:22 2004
Message-ID: <MABBKMPNCMJJBPBGLHDNOEANCHAA.christian.anger_at_aon.at>

I got some other Info on the Koefels Structure :

MORE IMPACT AND IMPACT-LIKE STRUCTURES ON SIR-C RADAR;
EUROPE, AFRICA, AND ARABIAN PENINSULA. J.F. McHone1 and R. Greeley2,
Dept.of Geology, Arizona State University, Tempe, AZ 85287-1404. .
1jmchone_at_asu.edu 2greeley@asu.edu
In April and again in October of 1994, the
Spaceborne Radar Laboratory (SRL) was
carried aloft on two separate missions aboard
Space Shuttle Endeavour. The objective of
these flights was to obtain high resolution
multiwavelength and multipolarized (SIR-C
& X-SAR) radar images of a wide variety of
preselected ground targets including several
known impact structures. Impact scars are a
fundamental interplanetary landform and the
characterization of terrestrial craterforms using
remote sensors is pertinent to the study of all
coherent bodies in space. Both missions were
sucessful and preliminary descriptions of numerous
crater images derived from radar data
have been reported [1,2]. As analysis of the
growing inventory of processed images continues,
several additional sites of interest have
been detected. These newly identified images
are of either previously known or suspected
impact features, or they are of landforms
which have radar signatures resembling
impact structures. This report suppliments
previous findings with descriptions of images
over Europe, Africa, and the Arabian
Peninsula.

Koefels, Austria
47° 07'N; 010° 55'E 4 km dia.
Oetztal valley in the Austrian Alps was
originally selected as a SIRC/X-SAR
"Supersite" in order to obtain repeated spaceborne
radar coverage of alpine glaciers and
their relation to global climate changes. The
Koefels structure lies within this study area
and is widely regarded as a probable impactgenerated
feature [3]. It consists of a 4 km
wide slump scar cut into the western wall of
the Oetz River valley and a corresponding
mass of fractured coherent rock and debris
which partially dams the valley floor. Shock
metamorphic features reported in components
of this rock mass [4] have strenghtened the
concept that the Koefels landslide event was
triggered by meteoritic impact. On a radar
scene generated during SRL-1, Data Take
78.00, Koefels is clearly imaged. Sides and
upper ridge line of the slump scar are sharply
defined by radar shadows and by slope effects
along the valley wall. The terraced valley
floor in the vicinity of the slump block is
widened with thick, smooth-surfaced
sediments which appear radar-dark compared
to the radar-bright mass of fallen debris.

Lunar and Planetary Science XXVIII 1149.PDF


I attached the SRL1-Image with this email, but it was bigger than allowed.
You can see it now on http://austromet.com/Koefels_SRL-1_Data_Take_78_00.jpg

Greetings from Austria,

Christian


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Ing. Christian ANGER
Korngasse 6
2405 Bad Deutsch-Altenburg
AUSTRIA

email : christian.anger_at_aon.at

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Received on Tue 02 Apr 2002 02:29:51 PM PST