The deeper it went off and the more powerful it was up to a point the bigger the wave or waves it could generate if people were engineering this.
The effect likely would be like a tidal wave in that the whole level of the ocean would raise up and travel way inland like when it completely destroyed Bandah Aceh in Indonesia in 2004.
But, this is insane because we have most of our worst Atomic weapons in places like Colorado and Wyoming and in space. So, you would have to be completely out of your mind to do this in the first place because step 2 all your cities would be gone in 1/2 hour if anyone did this including Russia.
So Yes. This is completely insane, simply because "What goes around comes around!" IT's Karma. Instant Karma! anywhere on earth or even in space if we can track who did this.
This is regarding Bandah Aceh in 2004:
Dec 10, 2014 - The area was devastated in the earthquake and tsunami, which killed more than 170000 people in Aceh. ... The Guardian view · Columnists · Letters · Opinion videos · Cartoons. Sport ... Boxing Day 2004 tsunami: Banda Aceh - then and now ... A boat on top of destroyed houses on 15 January, 2005 and 6 ...
Dec 29, 2004 - The Guardian view · Columnists · Letters · Opinion videos · Cartoons ... Wed 29 Dec 2004 11.32 EST ... "Seventy-five percent of the west coast is destroyed, and in some places it's 100%. ... In the provincial capital of Banda Aceh, where the stench of decomposing bodies filled the air, bulldozers prepared to ...