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Originally posted by neformore
It depends on the type of strata below the point of explosion as to whether a crater will be left behind.
I think you'll find that the mythbusters detonation was carried out in an old quarry, which means that the blast wave would be reflected up off the rock bed beneath, and as such may not leave a crater.
Road ways are constructed out of layers of asphalt, each having a different purpose with regard to the performance of the road, and although bituminous or concrete roads are strong, if the sub-strata they are laid on is weak and any services/conduits/sewers lie beneath the point of explosion the chances are that the compression caused by the detonation will cause them to shear, crack and blow apart, causing a crater.
Pakistan's army said later that troops recovered the wreckage of an unmanned spy plane near the Afghan border.
A U.S. defense official also said no Defense Department drones were missing
"We are collecting evidence. The explosives were similar to those used in the Danish embassy, which was claimed by al-Qaeda, and the attack on the ISI (Inter Services Intelligence) camp in Rawalpindi last year," the official said. An al-Qaeda leader claimed responsibility for the attack on the Danish embassy, but no group said it had targeted the ISI facility.