The Use Of Geophysical Methods For Assessment Of The Fracture Process Due To Mining Subsidence

The space distribution and time advance of subsidence of rock overburden in exploited<br>areas depends on the volume and shape of the exploited area.<br>Three causes of subsidence are discussed in the paper; tunnels with elliptical crosssection,<br>upward moving elongated disturbance of rock properties, and exploited areas beyond<br>long-wall exploitation. In each case, seismic and geoelectric methods may be used to assess<br>the fracture zone shape and location or predict the appearance of fracturing.