And tsunamis
Maybe you just ride them out in the personal submarine you keep in your underwater garage.
Tsunamis wouldn’t have any impact at all on a floating city, unless it was so close to shore that it ended up run aground during a tsunami’s initial retreat from the shore. Tsunamis at sea are rarely more than a couple of feet high, and their peak-to-trough is so long you wouldn’t notice them at all.
Now, rogue waves on the other hand would be a serious hazard. However, the benefit to a floating city is that it can be moved to avoid all but the largest areas of heavy seas.
A tsunami could pass right underneath you and you might not even notice it..............
Put ‘em far enough out and they’re ride right over a tsunami.
Hurricanes and pirates, though.