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Calc for shaking a city?

Depends massively on the city in question. Do you have anything more specific on the size of the city?
 
https://en.wikipedia.org/wiki/Modified_Mercalli_intensity_scale

lets go with a magnitude 3, since you didn't say how violent it was and this is basically the breach level to consider it an earthquake event that we humans actually would objectively observe

https://vsbattles.fandom.com/wiki/User_blog:Darkanine/General:_Destroying_New_York_City

this says new york's radius is approx 15.79 km in radius

Magnitude at the epicenter = 3+0.0238*15.79 = 3.375802

Energy = 10^[1.5*(3.375802)+4.8] = 7306392519.56 joules or Building (busting) level or 8-C
 
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