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Salt Lake City covers an area of 110.4 square miles. To simplify the calculation I will assume this is circular (which it isn't). Thus the estimated radius of the city is 5.9 miles.

5 psi dynamic maximum overpressure (which will damage or destroy most conventional structures) can be produced at this range by a 25 megaton bomb.

50 psi dynamic maximum overpressure (which will destroy all but hardened structures) can be produced at this range by a 400 megaton bomb. No bomb of this yield has ever been built.

Fires ignited by thermal radiation can be produced at this range by a 1 megaton bomb and it is likely these could merge into a firestorm that would destroy the city.

However it is very unlikely that a single bomb would be used, instead six to ten 100 kiloton to 300 kiloton bombs scattered across the area would produce more damage at less cost.

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