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Impact Craters
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Description:
Impact craters are caused by a violent impact of a meteorite with the surface of the Earth. This category was created to find those impacts and educate the visitor about the subject.
Expanded Description:
Image used with permission for www.armageddononline.orgIf you have ever seen a shooting star then you have seen a meteorite. Meteorites usually burn up in our atmosphere before they get even close to the surface of Earth, but occasionally a large enough piece will hit causing disastrous effects.

Craters range in size from 0.4km to 300km in diameter and can be classified as either a Simple (Eg Barringer Crater)  or Complex (Eg Vredefort Dome)  in their form. Simple impact craters are usually smaller and circular in shape, the crater forms a definite bowl shape. A complex crater is made by a much larger meteorite which produces more force on the crust of the earth, the tremendous force causes the crust to form ripples on the Earths surface.

Daniel Barringer was the first person to propose that a crater found in Arizona was a meteorite impact, however his theories were not well accepted. Most believed that these craters were made by volcanic activity. He presented his first papers supporting his theory to the U.S. Geological Survey in 1906. Only in the 1960's did the first conclusive evidence of impact craters appear. This time by a geologist named Eugene Shoemaker. Shoemaker did tests on the nuclear testing grounds where he found a ring of ejected material called shocked quartz. Shocked quartz is formed by intense pressure that volcanic activity could never achieve. He found the same material in the Barringer crater which finally ended the debate. Shock quartz is found in all impact craters and is used to test whether a crater is formed from a violent impact.

Baringer CraterThe size of a crater depends on a number of factors: The speed, size and composition of the meteorite all determine the force the meteorite will exert on the earth, whilst the rock that the meteorite hits will also determine the craters size. Craters will erode and change shape over time, this can be due to general weathering or an effect called slumping. Slumping occurs in the walls of the crater over time and depends on the density of the rocks in the area.

Today more than 150 surface craters have been documented from around the world.


For more information, or to find a crater near you go to http://www.unb.ca/passc/ImpactDatabase/index.html


Many thanks to Earth Impact Database for the use of the Barringer Crater photograph and to Armageddononline for the use of the meteorite impact simulation picture.

Instructions for Posting a Impact Craters Waymark:
1. Original coordinates must be taken by you of where you believe the best viewing location of the crater to be:
  • If the crater is very large multiple posts may be allowed.
  • In some instances the crater may be completely eroded and not distinguishable from the surrounding landscape, in this case we ask that you make the coordinates of some place of interest in the area, make it as interesting to the visitor as possible.
2. The default photo must be a non-copyrighted image of the impact crater

3. The standard format for naming a waymark in this category is - Crater Name, Location of the Waymark (Eg. The Big Crater, South Rim or The Big Crater, Impact Basin):

Please try stick to this format to help us out when dealing with multiple posts of larger craters.

4. Include as much information about the crater:
This category has been created to educate the visitor of the crater that you have waymarked, so please include as much information, not only of the impact, but of the area around the crater as well.

Impact Structures are allowed in this category.
Pseudocraters are not allowed in this category.

Instructions for Visiting a Waymark in this Category:
1. An original photograph of your visit must be supplied with your log. Invalid logs will be deleted.
2. The waymark owner may have specific logging requirements
Category Settings:
  • Waymarks can be added to this category
  • New waymarks of this category are reviewed by the category group prior to being published
  • Category is visible in the directory
Variables:
  • Type of Crater
  • Crater Diameter
  • Age of Crater
  • Crater Web Page
  • View from the Coordinates
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Image for Aarhus meteoren, Denmarkview gallery

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Impact CratersAarhus meteoren, Denmark

in Impact Craters

I 1951 faldt en lille meteorsten ned i Risskov ved Aarhus. In 1951 a small meteorite fell in Risskov in Aarhus.

posted by: Groundspeak Premium Member kallehaugerne

location: Denmark

date approved: 8/6/2020

last visited: never

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