SeCorrPhon AC 06
Combined correlator and electro-acoustic water leak detector
When pressure pipelines leak, water gushes out of the crack into the ground.
The pipe material vibrates at the leakage point. These vibrations are transmitted by the pipe and can even be noticed at distant contact points, for example fittings.
The water jet and the pipe in the vicinity of the leak also cause the ground to vibrate. These vibrations are transmitted through the ground to the earth's surface where they manifest themselves as ground noise.