advocates of the ctbt argues "...there is recent demonstration that the ims will be able to detect and identify non-evasive explosions of less than 1 kiloton in some strategically important areas." initial indications, in august 1997, pointed to a seismic event in novaya zemlya, which is russia's main test site. at first, it was believed to be a hidden nuclear test. ims sensors, however, helped locate the event offshore, in the kara sea. ims also established that it was an earthquake, not an explosion.