second wall may be redundancy necessity, I have no intention to convince how convenient it might be to have one, but moonquakes, nearby asteroids and vacuum next to the wall, I guess it moves the construction more like to the side of nuclear bunker, and they do have such types of stuff for different reasons as much as I heard that.

moonquakes don't exceed 3.0 on the richter scale. they happen pretty often and last a while, but it is a question of vibration, really.

vibration can be dampened outside the habitat for levels like that.

and there is a whipple shield for meteoroids.

I'm not talking about protecting space hab from meteorites. I talking about moo hitting by 1km size on other side

well, by the time that is worth planning for, we're talking about the city. by that time, this whole set of habitats will have been enclosed within the new city.

you'll see it will have double layer walls :D

just of reasons of geometry