Watch: Rectangular Icebergs Spotted by NASA Crew
S. Himmelstein | October 26, 2018A recent aerial survey of polar ice conducted by NASA’s Operation IceBridge team documented a peculiar iceberg formation in the northern Antarctic Peninsula. The crew observed two icebergs of rectangular, or tabular, shape, apparently newly calved from the Larsen C ice shelf that released the massive A68 iceberg, a chunk of ice about the size of the state of Delaware, in July 2017.
“I thought it was pretty interesting; I often see icebergs with relatively straight edges, but I've not really seen one before with two corners at such right angles like this one had,” said IceBridge senior support scientist Jeremy Harbeck.
Source: NASA/Jeremy Harbeck
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I've read several articles about this rectangular iceberg. They say that it's much wider than it is tall, but so far none has hinted at why it's broken at right angles. It looks far too perfect to be a fluke.
I have a private theory that the ice fractures in shear stress, and if tension or compression stress were applied to the ice, then the direction of maximum shear stress would be at +/- 45 degrees of the applied stress and thus at right angles, but that's just a guess.
(Mohr's Circle)
Anybody else have any ideas?
Must be Alien's !