With Paul AE5JU I’ve been discussing by email what I’ve read in EMP literature.
There are three types of EMP energy risks. Each with their own mechanisms and countermeasures.
And less formal but useful sources:
As EMP E1,E2,E3 are very different with different effects and countermeasures, I’ll post some of our thoughts down the road in relationship to each type of EMP and Ham Radio.