Written by Michelle Ridley Tuesday, 11 March 2008 14:48
NEXT time you’re virtually roaming Google Earth, make sure you take a close look at any unusual landforms.
Dr Hickman, from the Geological Survey of Western Australia, was using Google Earth to look for iron ore when he noticed an unusually circular structure.
He sent a Google Earth picture of the structure to his colleague Dr Andrew Glickson at the Australian National University, who later visited the area and confirmed that Dr Hickman had found a particularly well preserved meteorite crater.
“Our best estimate at the moment is that the crater is 10,000 to 100,000 years old,” said Dr Hickman.
The crater is 270m across (around the size of the MCG) and is just 35km north of Newman, but hadn’t been previously discovered.
The area was even mapped by the Geological Survey of WA about 20 years ago, but the crater went unnoticed.
So could anyone be using Google Earth and find their own meteorite crater?
“Sure,” says Dr Hickman, “Large meteorites hit every few thousand years, so when you consider that the landscape is millions of years old, there’s a lot of potential for meteorite craters out there.”
On a satellite image, meteorite craters are distinguishable from other landforms because they are almost perfectly circular and have a raised rim.
Dr Hickman said that about 30 per cent of Western Australia is shown in very high image quality on Google Earth.
The research done by Dr Glickson and his team suggest that the amount of energy released when the meteorite hit was the equivalent of 200,000 to 300,000 tonnes of TNT.
The next stage of the geologists’ research is to try and find fragments of the meteorite, a process that is being hindered by the amount of black iron-rich rock in the vicinity of the crater.
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