Kimberlite pipes are usually sub-vertical column-shaped zones of reduced velocities formed by the rise of degassing igneous rocks. They are ideal objects for a survey using our technology, even when they do not reach the surface for hundreds of meters and their diameter in plan is very small compared to their vertical size.

GEMS has a number of features that distinguish it from related methods of passive seismic prospecting that are currently common in the world. 

The peculiarity of Terravox technology is that sub-vertical boundaries and contacts are more technologically convenient objects for research than sub-horizontal ones. Interaction with sub-vertical velocity contacts is more emphasized. 

Our method  is based on measuring the amplitude distortions of waves at velocity contacts; therefore, its resolution in plan is also quite high in comparison with similar methods.