[time-nuts] another use for GPS: detecting underground nuclear tests

[beale]

"Even underground nuclear tests leave their mark on the part of the upper atmosphere known as the ionosphere, the researchers discovered, when they examined GPS data recorded the same day as a North Korean nuclear test in 2009. Within minutes on that day, GPS stations in nearby countries registered a change in ionospheric electron density, as a bubble of disturbed particles spread out from the test site and across the planet."

"Jihye Park, a doctoral student in geodetic science at [Ohio State University], is presenting the results of the study this Wednesday, Thursday, and Friday in a poster session at the CTBTO meeting in Vienna, Austria."

...from http://researchnews.osu.edu/archive/gpsnukes.htm