If you put the coordinates into Google maps you get this address: http://goo.gl/maps/TNfuD
So it looks like they're bombing their own nuclear facility.
During a test, the explosion energy is released in less than a millionth of a second, according to CTBTO. The temperature will reach about a million degrees within a few microseconds, and shockwaves from the blast, depending on the size, can be detected by seismographs around the planet.
(From time.com)