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Seconds after the Haiti earthquake struck, Jan. 12, 2010, a handful of earth-bound GPS stations in the region registered the huge tremor and relayed it to satellites overhead. The data then zipped to a small facility in Golden, CO, the National Earthquake Information Center..Computers there rapidly calculated the number of people exposed to the quake in Haiti and identify areas most vulnerable to structural damage. This information was quickly relayed to the UN, American embassies, scientific groups and public safety agencies to help them pinpoint the areas in need of disaster relief..The U.S. is the only country that runs this kind of facility, and it has become the world's eyes and ears on temblors. .(Nathan W. Armes for The Wall Street Journal)