I just rewatched the clip on YouTube like 5 times. It’s more powerful than a nuke since I doubt a nuke would cause a landmass albeit a very unstable landmass fall apart like that. Yet tanking the explosion the explosion was very spread apart. I believe Thor tanked about as much as iron man did since nothing on screen shows Thor getting hit by anything other than his own lighting. Nukes are more destructive when in a small area like where supes was. The nuke is more concentrated.
I’m gonna try my best to put it into perspective. Sokovia is a rock. Thor and IM shattering it is like smacking it with a mallet and it breaking.A nuke is like a small single hit firecracker. It can bust some of the top of the rock off but aside from burning the top of the rock, the firecracker wouldn’t do much. A mallet hitting the rock would have much more energy transferred than a firecracker, but the two are completely different kinds of energy. IMO having a firecracker going off in your hand is much more painful than having a mallet hit a rock with your hand under it, and will probably do different kinds of damage. I’m not counting the lightning in Sokovia since Thor isn’t affected by that.