How many impact craters are there on Earth ?

[trader10]

How many impact craters are there on Earth ?

According to the Earth Impact Database, 174 known impact craters on the planet's surface with diameters larger than 15 metres, and 29 known impact craters over 25km in diameter, caused by meteorite strikes.


http://www.unb.ca/passc/ImpactDatabase/CIDiameterSort2.htm

[skwinty]

Imagine how many landed in the sea and not to forget those which have been recycled in continental drift.
Regards
Steve;)

[trader10]

hi steve,

heheheheeh 71% of the planet's surface is covered by ocean so we definetely should call the Planet Water and not Earth..... LOL

Definetely should be interesting to recover many items coming from the space/skies that have dropped in our oceans.....

cheers :)

[Gargoyle_Steve]

26 of the 174 listed at that linked page located in Australia.
Nice!

Map of Australia here showing the location of all 26 "impact structure" sites:

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

[Dog Star]

I've got a (self published) book by an old bushie name of Bert Cramer(Comet Alice-3 comets and a camel) wherein he claims to have been one of the first to correctly identify Gosse's Bluff as a comet impact site. He also claims that at least 2 other comets struck the Alice Springs area and another huge one struck around the Tennant Creek area. Not too sure about his science though. I'd be interested to hear the opinions of anyone who's read this admittedly obscure little book.

[kinetic]

I know this is an old thread but......

I found this area while browsing the Nearmap photomaps site.
This is just to the west of Bundaberg and north of Miles/Toowoomba
http://www.nearmap.com/?ll=-24.859026,151.45443&z=12&t=h&nmd=20040101

It looks about 4km across.

Hopefully the link will work and you can zoom out and see where it
is roughly.

What is this?....Any locals know what this circle is?

Two posts below Steve (Gargoyle) has a link to most of the
Australian impact sites....
A map is shown here....scroll down
http://www.passc.net/EarthImpactDatabase/Australia.html


Steve

[Mick]

interesting, maybe volcanic?

http://www.volcanolive.com/monto.html

http://maps.google.com/maps?hl=en&ie=UTF8&ll=-24.859026,151.434174&spn=0.289707,0.878906&t=h&z=11

[Trixie]

could be an igneous intrusion? The Qld dpt of mines would have geological maps of the area. Dont know if you can view them online or not though

[gary]

Hi Steve,

Earthsci.org have a link on this feature.
See here - http://earthsci.org/fossils/space/craters/qcrater/qcrater.html



The Google Earth image has higher resolution than the nearmap.com image posted above.

Wikipedia page on Layered Intrusion here -
http://en.wikipedia.org/wiki/Layered_intrusion
Wikipedia page on Ultramafic rock here -
http://en.wikipedia.org/wiki/Ultramafic
Donate to Wikipedia here -
http://wikimediafoundation.org/w/index.php?title=WMFJA085/AU&utm_source=donate&utm_medium=sidebar&utm_campaign=20101204SB002&country_code=AU&referrer=http%3A%2F%2Fen.wikipedia. org%2Fwiki%2FUltramafic

[kinetic]

Ahhh...so that's what it is.
Thanks Gary, guys, interesting stuff.:thumbsup:

[gary]

No worries Steve. Keep searching and good luck. It has been amazing
what people are finding by scouring these satellite imagery resources on the net. :thumbsup: