Yeah I should have clarified the difference between an MRI frequency and microwave is the frequency. However an electromagnetic pulse, unlike an MRI or microwave is a signular high voltage EM burst.
EMPs don’t really effect people, which was why Starfish Prime as considered a “non-lethal” military weapon. It was meant to destroy electrical equipment and power plants, not people. Some people who have played Contra or Command and Conqurer (or TA) can be sticklers about EMPs being nonlethal.
Of course in practice an EMP would kill millions: anyone depending on food preparation equipment, utilities, medical care, pace makers, and generally anything that makes society function would find themselves in a tough spot. However the human faction in trem are all healthy clone warriors who are already well fed, it would take an EMP weeks to probably kill them. Not to mention these clone soldier guys are probably survival trained.
Of course in the future electrical equipment would probably have rf chokes, fuses, microcontrollers, and some faraday shielding. Its the future and in space EMPs from solar spots etc are pretty common…
So I assume an EMP would make equipment and electrical weapons like the pulse rifle temporarily cease to function. Rifles and shottys should not be effected. Armory and electrical devices should temporarily be disabled by an EMP as the safety switches would turn them off if an EMP was blasted.
A sustained microwave emission by nanites would be lethal and quite different from an EMP. One is a brief strong electromagnetic field that induces high voltages in metal circuits, the other is a constant outpouring of radiation. In example the USAF HEMP bomb(electromagnetic coil wrapped around an explosive charge) is imperceptible to people…but the ADS(Active Denial System) is noticible by living things because its a constant beam of tuned microwaves. One is like a laser, and the other is like brief radio discharge.
All of the above being said having two kinds of nanite attacks could add a fun dynamic to game play Waves of EMP attacks, Waves of radiation bombardment, then waves of melee attacks or something. We could use the difference between the two types of attacks in a creative way to make the nanites a more complex and more developed enemy.