Originally Posted by Guest

One blast generating EMP would not cover the USA:

7 Answers - What is the range of an EMP wave caused by a nuclear explosion? - Quora

Regardless who starts it the city and surrounding areas of Seoul S. Korea will be wiped off the map by the thousands of artillery pieces in NK already targeted to the area.

Maybe within the same hour the US shuts down most of N Korea...conventionally or nuclear or both.

The altercation will go some 24-72 hours with millions of both S & N Koreans dead. If the fat boy has a chance and if he has anything in his nuclear arsenal other than BS he will send what ever he has to some US military site nearby or Hawaii.

Alternatively to try to eliminate the extinction of Seoul the US may try a multi pronged, covert, interior Seal Team 6 type effort to neutralize the nuclear sites. This would require a simultaneous massive attack on the thousands of artillery pieces aimed at Seoul.

No matter the scenario there will be a massive loss of civilian life in the process.