. . . a technique known as SAR Interferometry (InSAR), a sophisticated version of 'spot the difference'. InSAR involves combining two or more radar images of the same ground location in such a way that very precise measurements – down to a scale of a few millimetres – can be made of any ground motion taking place between image acquisitions. - ( Science Daily )
By doing this, scientists have created an interferogram image which shows the movement of the Earth as colored "fringes" detailing just how much the ground moved. In some places it moved as much as 25 centimeters! Amazing. Click the image below to enlarge.
HERE for a better explanation of the image.)