[Domestic Church]

Might this cause tidal waves?

[glock rocks]

just temporary ones.

i guess we could just be happy they don't port in long beach.

or steam into the hudson.

[John H K]

Might this cause tidal waves?

The energy of every nuke in the world combined is trivial compared to the energy of your average tsunami-causing earthquake or volcanic collapse.

So no, you can't cause a tsunami with nukes, unless you happened to be RIGHT NEXT to where it went off, and you have plenty of other problems to worry about then. You can't create a noticeable wave over hundreds of miles.