[meteorite-list] How to Discover Asteroid Impacts
How to discover asteroid impacts The story of the discovery of two impact craters By Emilio González, March 13, 2006 http://www.astroseti.org/impacts.php __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] How to discover asteroid impacts
http://www.astroseti.org/impacts.php __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] How to discover asteroid impacts
Hi, Darren, List I've been searching the desert for additional craters, too. Here's a couple more candidates beside the two mentioned on the astroseti.org website. Let me stress that I am neither a geologist nor an aerial photointerpreter, so these are just what looks good to me. First, 37 miles WSW of the newly noticed Kebira crater, at 24 deg 34' North and 24 deg 24' East, is a 2.57 mile crater. It has no central uplift and has been cut by ancient stream courses, so that its interior is at the same level as the surrounding terrain. The rim is raised 100 to 300 feet. There are fairly clear traces of an outer ring with a diameter of approximately 9 miles. The ancient eroded outcrops in which it lies all have features that run a little west (east) of north (south). The crater's arcuate features cut right across the lie of the land. Frankly, it looks as much (or more) like a crater than Kebira itself. The imagery I can access is not detailed enough to examine the rim for upturned strata. Secondly, at 22 deg North and 16.5 deg East, there are a number of features that are eliptical in nature stretching to the west of the indicated location. This is a region in which old outcrops running almost north-south are being submerged in the Great Sand Sea. Many features are irregular ovals filled with sand to the same level as the surrounding terrain, are probably former ancient lakes, and lie at the margins of the outcrops, as you would expect lakes to do. But the first of them, at 22 deg North and 16.5 deg East, is chopped right across and completely through a prominent outcrop. It is an very regular ellipse with a 5.1 mile major axis and a 3.9 mile minor axis. Its floor is 300 feet below the surrounding terrain (despite the blowing sand which should have filled it in, I would have thought). What makes me consider it a candidate is the way it is cut through the elevated eroded mountains like it was punched out by a giant cookie cutter, hardly the way (or place) a lake would have formed. This region is rife with circular features, of course, when viewed at a distance, but with closer inspection resemble true craters not at all. I've zoomed through 40 or 50 of them and these two are the only ones that seem to be craters (to me, at least). The List being replete with individuals with lots of geological expertise, tell me if you think there are more obvious explanations for these features than the energetic expression of a rock from space. Sterling K. Webb - Original Message - From: Darren Garrison [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Saturday, March 11, 2006 9:53 AM Subject: [meteorite-list] How to discover asteroid impacts http://www.astroseti.org/impacts.php __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] How to discover asteroid impacts
In a message dated 3/11/2006 8:57:48 P.M. Mountain Standard Time, [EMAIL PROTECTED] writes: Hi, Darren, List I've been searching the desert for additional craters, too. Here's a couple more candidates beside the two mentioned on the astroseti.org website. Let me stress that I am neither a geologist nor an aerial photointerpreter, so these are just what looks good to me. First, 37 miles WSW of the newly noticed Kebira crater, at 24 deg 34' North and 24 deg 24' East, is a 2.57 mile crater. It has no central uplift and has been cut by ancient stream courses, so that its interior is at the same level as the surrounding terrain. The rim is raised 100 to 300 feet. There are fairly clear traces of an outer ring with a diameter of approximately 9 miles. The ancient eroded outcrops in which it lies all have features that run a little west (east) of north (south). The crater's arcuate features cut right across the lie of the land. Frankly, it looks as much (or more) like a crater than Kebira itself. The imagery I can access is not detailed enough to examine the rim for upturned strata. Secondly, at 22 deg North and 16.5 deg East, there are a number of features that are eliptical in nature stretching to the west of the indicated location. This is a region in which old outcrops running almost north-south are being submerged in the Great Sand Sea. Many features are irregular ovals filled with sand to the same level as the surrounding terrain, are probably former ancient lakes, and lie at the margins of the outcrops, as you would expect lakes to do. SNIP -- --- For more information on that area, did you look on my website at the report published by a French Expedition: http://www.impactika.com/acarion.html And the article in the August issue of Meteorite magazine, written by Alain Carion. They have already found upward of 100 impact craters in that area. Some are clearly visible on the pictures. Enjoy! Anne M. Black www.IMPACTIKA.com [EMAIL PROTECTED] President, I.M.C.A. Inc. www.IMCA.cc __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] How to discover asteroid impacts
Hi, Anne, Knowing that the crater field in SW Egypt has already been discovered, I didn't examine it. The first crater I listed is 35 miles inside Libya. Kebira itself lies right on the Egypt-Libya border, with about 60% of the crater lying in Libya. Whoever goes to poke and probe it will need the cooperation of TWO governments... Bon chance. The second candidate I listed is in Chad and is possibly reachable from the Aozou Airport, assuming you could ever get permission to fly in. Again, bon chance. The craters shown in the article are at such a small scale (1200 meters and down) that the search in, say, GoogleEarth, would be arduous. They're great little craters, though, and are pretty unmistakable when seen at ground level. And the shattercone photo is one of the best photos of shattercones in place that I've ever seen. Sterling K. Webb - - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED]; Meteorite-list@meteoritecentral.com Sent: Saturday, March 11, 2006 10:12 PM Subject: Re: [meteorite-list] How to discover asteroid impacts In a message dated 3/11/2006 8:57:48 P.M. Mountain Standard Time, [EMAIL PROTECTED] writes: Hi, Darren, List I've been searching the desert for additional craters, too. Here's a couple more candidates beside the two mentioned on the astroseti.org website. Let me stress that I am neither a geologist nor an aerial photointerpreter, so these are just what looks good to me. First, 37 miles WSW of the newly noticed Kebira crater, at 24 deg 34' North and 24 deg 24' East, is a 2.57 mile crater. It has no central uplift and has been cut by ancient stream courses, so that its interior is at the same level as the surrounding terrain. The rim is raised 100 to 300 feet. There are fairly clear traces of an outer ring with a diameter of approximately 9 miles. The ancient eroded outcrops in which it lies all have features that run a little west (east) of north (south). The crater's arcuate features cut right across the lie of the land. Frankly, it looks as much (or more) like a crater than Kebira itself. The imagery I can access is not detailed enough to examine the rim for upturned strata. Secondly, at 22 deg North and 16.5 deg East, there are a number of features that are eliptical in nature stretching to the west of the indicated location. This is a region in which old outcrops running almost north-south are being submerged in the Great Sand Sea. Many features are irregular ovals filled with sand to the same level as the surrounding terrain, are probably former ancient lakes, and lie at the margins of the outcrops, as you would expect lakes to do. SNIP -- --- For more information on that area, did you look on my website at the report published by a French Expedition: http://www.impactika.com/acarion.html And the article in the August issue of Meteorite magazine, written by Alain Carion. They have already found upward of 100 impact craters in that area. Some are clearly visible on the pictures. Enjoy! Anne M. Black www.IMPACTIKA.com [EMAIL PROTECTED] President, I.M.C.A. Inc. www.IMCA.cc __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
