U.S. President Donald Trump threatened Sunday to cut off all trade with countries doing business with North Korea, an ...

The EMP from the explosion was so powerful it knocked out streetlights in Hawaii, around 900 miles from the explosion, and left a radiation field in low Earth orbit that damaged satellites.

Besides, given the EMP effects electrical systems in the line-of-sight of the explosion, a detonation at around 25 miles would only affect infrastructure on the ground within a radius of roughly ...