Seismic arrays
Large arrays of very sensitive sesmometers are operated by several countries around the world to verify that no "illegal" nuclear tests are made by anybody. I have tried to get their sensitivity and directional resolution, but failed. Here in Sweden they are operated by the military research institute (FOI). I know that the explosion of the Kursk was detected very much above noise. Does anybody know if similar very sensitive arrays exist in Brazil or Dakar?