>>537763
Yes but the damage would be temporary, near the center of the blast, there would be some flooding, theyd tow a temporary barrier there by boat, and it would be fixed in a few months.
Not even a nuclear missile could permanently hurt that dam. See the concrete above the ground? Rule for dams, as much concrete as there is above the sediment, there's three times as much below ground. That's reinforced, it's not going to get toppled by a nuclear pressure blast, it won't be incinerated by the thermal blast.
Dam construction has improved since WWII, it's fuck hard to do it now. Maybe an older dam built before WWII would be vulnerable.
>>537776
Yes. Any type of fault under stress can be moved by repetitive, and large scale enough vibration.
A continental fault like at california can be moved by drilling channels to the fault layer and placing a string of fifty or so nukes there, then detonating them all at once to separate the fault layers. The separation doesn't have to be total, just enough to reduce the coefficient of friction enough to cause fault movement. Pressure from the nukes would move along the path of least resistance, across the fault slightly separating it, like too-weak fart that moves through your clenched buttocks and pops out. Then the whole "california sinks under the oceans" thing happens.
Yellowstone isn't a continental fault, it's a supervolcano. Basically a giant zit that's too weak to pop, so it just cooks there. BUT it has a set of ring faults surrounding the giant zit. If you drill hundreds of channels around the fault and place explosives there, and then detonate at once, it would cause fault movement. The "roof" or the rock over the caldera to press it down, and squeeze the magma out through the weakest spots.
However you can't use nukes at yellowstone, it's too fragile for that. A nuke could open a smaller channel and let off pressure, then bury the whole thing and maybe even make it safer. Because TNT would have to be used, it would require a LOT more tunnels, hundreds, potentially more.