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Offline SueTopic starter
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« on: July 30, 2010, 11:27:12 pm »
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METEORITE IMPACT CRATER FOUND WITH GOOGLE EARTH
The massive pock in southwestern Egypt was created no more than a few thousand years ago.

Researchers analyzing Google Earth images stumbled onto an impact crater in southwestern Egypt.
Although the crater was first noticed in 2008, satellite images first captured it as far back as 1972.

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http://news.discovery.com/space/meteorite-impact-crater-google.html


There's a nice picture of the crater.

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Offline meteoritesusa
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« Reply #1 on: August 09, 2010, 11:57:08 am »
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Gorgeous crater! There were many iron meteorites found near the crater. What an awesome discovery.

Eric

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« Reply #2 on: August 09, 2010, 01:05:00 pm »
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I thought it was a beauty - really impressive. I just saw this story about an impact in NM. It might not be new news to you, but it was to me. Sue
Ancient Meteorite Impact Shattered Santa Fe

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http://www.space.com/scienceastronomy/ancient-meteorite-impact-new-mexico-100809.html



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« Reply #3 on: August 10, 2010, 08:02:37 am »
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Those are two I hadn't heard about. Thanks Sue.  Smiley


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« Reply #4 on: August 10, 2010, 04:41:40 pm »
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Quote:Posted by Sue
I thought it was a beauty - really impressive. I just saw this story about an impact in NM. It might not be new news to you, but it was to me. Sue
Ancient Meteorite Impact Shattered Santa Fe

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http://www.space.com/scienceastronomy/ancient-meteorite-impact-new-mexico-100809.html



Yes I heard about that. Very cool stuff! There are impact craters all over North America. Check out the Earth Impact Database:

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http://www.unb.ca/passc/ImpactDatabase/NorthAmerica.html


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« Reply #5 on: August 11, 2010, 08:58:08 am »
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I did check out the impact database for quite awhile - impact craters are plentiful. I looked, most closely, at the Haviland one as I'm in Kansas. I was thinking large craters - not 'buffalo wallows' - but a crater is a crater  Smiley


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« Reply #6 on: August 11, 2010, 09:51:32 pm »
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Sue,   The meteorites that are coming out of the new crater discovery are very nice indeed. There are many photos now available and some have already been etched! Would love to add one to my collection. I am gonna wait a bit till the prices hopefully drop.

I live about an hour away from the Santa Fe impact area. I am planning a trip there and hopefully retrieve a few shatter cones to add to my collection as well. Should make for an interesting adventure!

Kansas, wow I have always wanted to hunt a few of the Kansas strewn fields!! One day I will make it down for a hunt or two. Have you made any recent finds there and can you share any photos? I would love to see them.

I am currently researching a possible remote meteorite crater here. It has been a very difficult endeavor so far. That's about all I can mention right now but will hopefully post on it one day in the near future.   

Thanks for the post!!                        Ironman

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« Reply #7 on: August 11, 2010, 11:04:38 pm »
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I always did wonder what percentage of the meteorite is actually left in the crater and what percentage disintegrates / explodes or scatters away from the impact area ? Great posting Sue .

HH............Eugene

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« Reply #8 on: August 12, 2010, 10:53:46 am »
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The only 'find' I've made probably wasn't a meteorite. The leading edge of a glacier was in the region and dropped rocks that aren't native to Ks. so that might be it's origin. You can look at it here. I'm in the E part of Ks where there's trees, hills, etc. The one, I thought I might have found, could have travelled farther & been the Vermillion meteorite that some farmers discovered when they were getting ready to plant wheat. Sue

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« Reply #9 on: August 12, 2010, 11:43:11 am »
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Quote:Posted by Eugene52
I always did wonder what percentage of the meteorite is actually left in the crater and what percentage disintegrates / explodes or scatters away from the impact area ? Great posting Sue .

HH............Eugene


The percentage of disintegration of the impactor is very high. Not much of the material from an asteroid large enough to produce a crater survives the impact. The force is something like a nuclear bomb detonating, thereby vaporizing the material almost instantaneously. What doesn't get vaporized is blasted away from the epicenter in all directions and falls in "rays and rings" around the crater and rim. Meteor Crater in Arizona is a perfect example of a larger asteroid impactor that did not completely vaporize. Much of the material survived. The Lunar & Planetary Institute has a good article on impact crater formation here.

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http://www.lpi.usra.edu/publications/books/CB-954/chapter3.pdf


This article is based on large impactors and suggest that most if not all a very large impactor will disintegrate.

A smaller asteroid will usually break up in the atmosphere and fall as multiple pieces, or even a single meteorite, never producing a crater, but an impact pit, or a strewnfield with multiple pieces of meteorite material "strewn" about in a distribution ellipse.

For an asteroid to form a crater without vaporizing or breaking up in the atmosphere, it must be the perfect size. A crater forming asteroid impactor, that leaves behind meteorite material must be a kind of Goldilocks rock, not too big to vaporize all together, but large enough to survive mostly intact and retain a cosmic velocity that's high enough to form a crater.

Eric

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