Explosions sometimes have a negligible effect outside of anything in the direct blast radius - buildings and sidewalks have relatively precise chunks taken out of them, but there's precious little singeing or shockwave damage. In the most blatantly overdone cases, the blast radius looks like a huge sphere of negative space 1500 feet across, with neat slices taken out of surrounding buildings, pavement, cars, hillsides, et cetera; there appears to have been no actual heat, let alone shockwaves, emanating from the explosion at all - the only result is that a massive spherical section of the city appears to be missing.