The latter, in the case of a detonation 100km from the surface. Its simply a function of line of sight to the ground.
Now, what the effects in that area is the question, and both Hawaii and Kakhakstan were in the range of the 1960s tests and there were no severe power station failures there.
Does this consider the inverse square law of EM radiation?
You mention transformers as a major economic/civilization failure point, and I agree with you, however they are massively hardened against lightning strikes, overload and other transients. Electronics and data nodes will be hit hard.
Aside from the seismic stuff, we used to have stations that would detect the electromagnetic emissions from a nuke. I imagine that we still do. So I figure that we should know. The fact that it has not been definitively announced makes me nervous..
I will believe it when I see it. They put cod that was frozen in a block of ice into the oven and want you to believe they can cook the cod to perfection without melting the ice. So how do you get the cooked cod out of the ice block when its done and who wants to eat ice cold cod? Crazy if you ask me.
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This technology is real, as far as cooking a fish inside of a block of ice. A guy I work with has seen it. I think it was an Isreali company. Is this a practical product? I don’t know. Can one cook a fish frozen in a block of ice? Yes.
Perhaps it is real. I didn’t analyze the video. However, as I casually watched it, I immediately dismissed it as fake.
More of a commentary on CNN in general.