If the mounts moved in absolute GPS position, it's likely both moved nearly equal amounts.

To use an extreme example, if the quake cause one scope to move right 1 foot, the other also moved right 1 foot as well. So the real question is how much they moved _relative_ to each other. This is the part important for the interferometry part.

Although the absolute position is important for proper sidereal tracking of the sky's motion, I doubt the quake caused the scopes to move in absolute position enough to make a difference. I'm sure any error is well within the limits of the star trackers that guide the scopes.

The damage, if I am understanding the reports correctly, was caused by the scopes moving in their mounts and damaging the system that measures the scopes position within the mounts themselves. Kind of like forcing a clock hand to move against the gears driving it.

Brian