I should think that the ground in that area is in constant motion and they would want to repeat their soundings over time to see how things change. 3D motion map.
179 posted on 08/01/2019 1:39:35 PM PDT by ichabod1
(He's a vindictive SOB but he's *our* vindictive SOB.)
I should think that the ground in that area is in constant motion and they would want to repeat their soundings over time to see how things change. 3D motion map.