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| Researchers at Ohio State University and their colleagues have determined that GPS can detect clandestine nuclear tests. This close-up of a Google map of Eastern Asia shows the site of GPS receivers (yellow pins), and the probable site for North Korea’s underground nuclear test in May 2009 (red pin). Graphs (in insets) show how the explosion affected electron density high in the earth’s atmosphere, marked by spikes (black arrows) in the GPS signals received in a sampling of the 11 locations used in the study. Also listed is the number of minutes from the time of the nuclear test for the signal to reach the GPS receivers. Image by Jihye Park, courtesy of Ohio State University. |
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Researchers at Ohio State University and their colleagues have determined that GPS can detect clandestine nuclear tests. This graph shows a spike (marked with black arrow) in the GPS signal received by a station in in Inje County, in Gangwon Province, South Korea, minutes after the North Korean underground nuclear test (here abbreviated “UNE” for “underground nuclear explosion”) in May 2009. Graph by Jihye Park, courtesy of Ohio State University. |
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