Link: http://blogs.scientificamerican.com/critical-opalescence/2013/11/11/what-happens-to-google-maps-when-tectonic-plates-move/
This is a nice readable article on the accuracy of GPS coordinates and georeference satellite imagery, geodetic datums, and how geographers try to keep up with Earth's dynamic crust. An interesting link in the article is this animation of a GPS network in Japan that shows the propagation of ground waves in the minutes after the 2011 Japan earthquake: http://www.youtube.com/watch?v=rMhhyb6Yy94
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