TYB
>I feel like that's incorrect
It is. Gravitation is quite a weak force.
Influence of the moon on EQs is very weak, and (even though shown in some cases) still being debated.
>What is the deal with the 10km depth
Earthquakes happen along faults. As you can see, except the CA EQ at 10.2km the 10km EQs are all Idaho-related, so I guess that's approx. the depth that fault system slipped.
In addition to that, exact depth determination is really hard to do, not rarely impossible. So errors in depth of 1, 2 or even more km (depending on event depth) are quite common.