Hi Glen, many thanks for your link to Gold mines. It would be good place to install our apparatus here, but there are some disturbances from the theoretical point of wiew. The localities in the surroundings of active faults are extremly sensitive to the stress, which main component is in the direction of the fault. The fault has one degree of freedom. So we will "see" any anomalous movement along fault and not across the fault. The better place for the localisation of hypocentre of anomalous movement is to put our apparatus outside active faults into the old rocks, which are "embeded" and which are isotropic in their sensitivity. We used 300 years old mine and our "localisation error" is 10 - 20 degrees. On the other hand our second apparatus on the active fault in cave is extremely sensitive on the all movements paralel to the fault and insensitive to the movement in perpendicular direction.