What in the heck is an EMP
Electomagnetic pulse caused by detonating a nuclear device high in the atmosphere.
It renders all electronic technology unusable.
Electromagnetic pulse. Specifically, it refers to a massive geo-electric current induced by something called the Compton effect, from a gamma-ray burst. The quickest way to create massive man-made EMP is to detonate a nuclear bomb with certain characteristics high in the ionosphere (about 40 miles up). Look up Starfish Prime on Google. They blew all the generators and telephone relays in Hawaii the last time this was done out in the Pacific, in 1962.
Smart guns, electromagnetic pulse, and planning for unknown-probability dangers