Not just “a city” - a region with a diameter of 1,000 to 1,550 miles. Read about project Starfish and the effect it had on Honolulu 1,500 miles away. Also read about the 1859 Carrington Event and its effect on global telegraphy. Lastly, keep whistling past the graveyard...it definitely keeps the spooks away.
I doubt most here will look up info on what you posted even though it documents the initial “Oh shit!” revelations of the impact of an EMP inadvertently released by our early nuclear weapons testing.
EMPs are real. What’s interesting about the Carrington event is I’m not sure they have enough data to create a scale. Carrington may have been a smaller event compared to those experienced by earth over the millennia.
Some time back, Quebec Hydro had their system taken down via CME. No power for many days. Quite a few larger transformers fried and switching electronics/protection devices had to be replaced.