Envisat's rainbow vision detects ground moving at pace fingernails grow
Originally developed to pinpoint attacking aircraft during World War Two, today's advanced radar technology can detect a very different moving target: shifts of the Earth's crust that occur as slowly as the growth of your fingernails. Radar data from satellites such as ESA's Envisat are used to construct 'interferograms' that show millimetre-scale land movements. These rainbow-hued images provide scientists with new insights into tectonic motion, and an enhanced ability to calculate hazards arising when this slow motion speeds up, in the form of earthquakes or volcanic activity....
Mason & Dixon>, p. 172:
"Look to the Earth," she instructs him. "Belonging to her as I do, I know she lives, and that here upon this Volcanoe in the Sea, close to the Forces within, even you, Mopery, may learn of her, Tellurick Secrets you could never guess."