As for the civilians on the surface, they probably wouldn't be evacuated since the explosion happened in the sky. However, even if they evacuated, they must first ask the permission of the android that lived in an underground city, do they deem this event as a disaster event that could affect humanity? If not the government wouldn't even contact the android with the authority that ruled the underground city known as Sanctuary across the planet.
As far as I know, there were also bunkers built for temporary use as well on the surface. Therefore even if the android refused to help civilians, the sectors 2 dome's government could use those bunkers.