This is a interesting article from the Bulletin of the Atomic Scientists which discusses the use of GPS to monitor Nuclear weapons testing. It appears that even underground weapons testing causes major atmospheric disruptions which result in GPS timing and hence location errors.
Initial results from analysis of North Korea’s second alleged nuclear test in 2009 produced not only seismic waves as expected, but created an atmospheric shockwave in the region which impacted the GPS reception of GNSS receiving stations in Eastern Asia.
The article seems to suggest another role of the rapidly expanding network of GPS stations used for local RTK networks.. Test Ban Treaty monitoring ?
Written and submitted from home (51.425N, 0.331W)