Thought this was interesting..
From the National Geographic - "The changes do not indicate that Earth is shrinking but rather that previous estimates—measured from Earth's core to its surface—were slightly off, the researchers explained.
"Earth's physical shape hasn't changed since last time, but we have just shown that on average our 400 observation sites lie around 2.5 millimeters closer to the center of the Earth," said Axel Nothnagel, a mathematician at Germany's University of Bonn who took part in the research."
Earth Is Smaller Than Thought, New Measurements Show