This is the result of the Goce satellite that is mapping gravity on earth. "It is a highly exaggerated rendering, but it neatly illustrates how the tug we feel from the mass of rock under our feet is not the same in every location. Gravity is strongest in yellow areas; it is weakest in blue ones."
"Chief among these new insights is a clearer view of how the oceans are moving and how they redistribute the heat from the Sun around the world - information that is paramount to climate studies. Those interested in earthquakes are also poring over the Goce results. The giant jolt that struck Japan this month and Chile last year occurred because huge masses of rock suddenly moved. Goce should reveal a three-dimensional view of what was going on inside the Earth."
"Professor Reiner Rummel, the chairman of the Goce scientific consortium, explained: "Usually, heights in the UK, say, are connected to one benchmark which is connected to mean sea-level, which might be measured at Liverpool, for example. The French do the same, the Australians do the same and the Chinese do the same - but mean sea-level differs from one country to the next. Now, with Goce, we can unify this so that we don't get the sort of surprises we had when they built the Channel Tunnel and discovered a half-metre offset between the UK and France."
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