This shows the movement of the Canterbury earthquake as measured by GNS in Greendale, same as my other video...
http://www.youtube.com/watch?v=H8lcvcQEdV4
...but with an attempt at "subpixel" positioning so the motion isn't so jerky for slow movements. I also added a 50mm grid because the small motion was then too smooth to see!
For more information on what this is, see:
http://www.youtube.com/watch?v=iCmOi4lNy1g
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