Earthquake caused by underground nuclear test.

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Test equipment is placed on shock absorbing legs.
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Faultless was 1 MT; it was designed, as was Mandrel/Milrow, as a calibration shot for a 5 MT Spartan warhead test. Fautless was anything but; it caused so many local problems that the warhead test there, called Adagio, was cancelled and instead the Amchitka site was chosen, hence Cannikin.

puncheex
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Sweet! HR-4 looks like some kind of atomic powered bounce castle!

TheHouseBlog
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It is. Cannikin, 5MT, 1700 meters down, on Amchitka Island in the Aleutians.

puncheex
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Indeed, yes. You are right. My apologies; I must try to be more careful.

puncheex
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It's faultless. This was a 1 megaton underground burst to calibrate the test site for the upcoming cannikin test, basically to see if the test range could withstand such a monstrous blast. Well come to find out.... It couldn't, the test site barely held up for this test at 1 megaton.

princessleotardovadincithe
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Personally, I wouldn't call this an earthquake. It is the result of the largest man-made underground blast the US ever set off. An earthquake to me results from shifting of rocks underground caused by the stress of plate tectonics. This blast caused an impact that would be a 7.0 richter earthquake. It was right on the edge of the Pacific plate, and it did trigger aftershocks (true earthquakes) up to 4.0. This is the only case I'm aware of in which that has happened.

puncheex
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I know but isn't this the faultless shot?
Is 00:26 Amchitka?

busyman