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damienpaul
2004-Jan-12, 05:50 AM
I was doing a touch of research on meteoritic impacts, and came across this article pertaining to an impact from a possible meteoritic air blast in southern Australia:

http://www.findarticles.com/cf_dls/m1200/2...1/article.jhtml (http://www.findarticles.com/cf_dls/m1200/21_160/81110075/p1/article.jhtml)

i'd like to hear others' comments about this or further links to topics similar.

Josh
2004-Jan-12, 05:55 AM
There is evidence all over the world for meteor strikes ... they seem to have been relatively common. Where have they all gone? Is there a reason that Australia and other parts of the world have been hit by so many meteors in the past but not anything recently? Or am I wrong and there are lots of major meteor strikes that I just don't know about?

damienpaul
2004-Jan-12, 05:59 AM
apparantly there are heaps occuring in the upper atmosphere - as seen from orbiters (cannot remember the ref for that). There is growing amount of evidence to suggest that there has been a lot of air blasts like Tunguska and the one in the article posted.

However, alot of these potential impact sites may have been misinterpreted as being anything from volcanism to forest fires. I wonder just how many there are?

Littlemews
2004-Jan-12, 06:01 AM
:lol: Interseting....but are you sure its Southern..I did a little research about this event, but both site saids it happens in Western Australia...I am sorry urs different ><

Ancient Meteorite Wiped Out Life
See : http://www.cbsnews.com/stories/2003/11/20/...ain584760.shtml (http://www.cbsnews.com/stories/2003/11/20/tech/main584760.shtml)

Australian Impact Craters
http://www.alphalink.com.au/~dannj/craters.htm

Josh
2004-Jan-12, 06:04 AM
Yes, I remember hearing about Tunguska and seeing a couple of documentaries on it. Nothing apparently hit the ground right? and no major strikes have been recorded as far as i know in any recent history. The orbitor might see lots of meteorites but i doubt they see major meteors. Is the atmosphere thincker now or something? Is there a reason for the lack of meteor strikes?

damienpaul
2004-Jan-12, 06:09 AM
yep, southern australia as well, read the article - its in south australia...more to add to the list&#33; pretty exciting stuff

Littlemews
2004-Jan-12, 06:12 AM
I found one about the TUNGUSKA ^^
Here : http://www.usm.maine.edu/~planet/tung.html

Littlemews
2004-Jan-12, 06:19 AM
Hmm I think I saw it on the Discover Channel before, I can&#39;t remember what was the name of that Geologist, but he found some very interseting glass on the cliff near the ocean somewhere in Australia... and this is the biggest impact ever seen..

Littlemews
2004-Jan-12, 06:27 AM
Australia is the best spot for Meteor Impact or Meteor Attack LOL. Australia has about 20 known impact craters...I wonder why...
Take a look at this site ^^
http://www.abc.net.au/science/k2/trek/4wd/Over11.htm

damienpaul
2004-Jan-12, 07:24 AM
The scientist who has been involved in this kind of study is a Dr. Haines of the University of Tasmania. I did some more googling and have found that this kind of deposit is actually quite common place in relatively stable areas in Australia anyway. Does anyone know of any other research being done on this elsewhere in the world?

Does anyone have any links to pictures to shocked quartz - which seem to be a diagnostic feature of such impacts.

anewton
2004-Jan-12, 08:31 AM
I&#39;ve been to Meteor Crater in Arizona. As you aproach it for the north, you see ripples of the ground push up like waves in a pond. That meteor was nickel and iron and they estimate the size of a 10 story office building. It hit with such force and heat that diamonds were actually formed&#33;

damienpaul
2004-Jan-12, 01:04 PM
have you got pics of the meteor crater?

These ones decribed in the article apparantly air-burst and caused sand to fuse into shocked quartz. I have emailed the scientist to see what other information was gained from the sites.

anewton
2004-Jan-12, 02:34 PM
My visit was way back in 1969. But you can do a yahoo search under Meteor Crater. It has a ton of sites. It&#39;s also known as Barringer Crater.

Biscay
2004-Jan-12, 04:03 PM
I heard that the main reason because of the lack of meteor strikes is the location of our solar system in the galaxy. I know I wont get this one right, but I think I understood that the milky way is constantly spinning and, therefore, we are too. Okay, this is the tricky part. Somewhere in the middle, in our way I mean, there are more asteroids and dangerous objects. Sometime in the past, Earth went thought this "barrier". Dinosaurs didnt knew this, of course. <_< And never got to know (before it was too late) My question is: If this is true, when will we go through the barrier again?

P.S.- I apologize if this is partialy or entirely wrong. As i said, I think this is what I heard. :unsure:

Littlemews
2004-Jan-12, 07:52 PM
I found a website that explain the comet/asteroid impact on Earth, not sure either comet or asteroid...
See : http://www1.tpgi.com.au/users/tps-seti/spa...d7.html#impacts (http://www1.tpgi.com.au/users/tps-seti/spacegd7.html#impacts)

damienpaul
2004-Jan-13, 02:41 AM
What type of energies are we talking about in these type of airbursts? could someone perhaps give me a comparison to certain nuclear armaments?