Within the Selby Coalfield, Yorkshire, UK, conventional 2D surface seismic surveying has determined the elements of the geological structure. These are large NE-SW trending faults of up to 130 m throw together with large E-W trending faults of up to 60 m throw. Faults with displacements down to 7 m have been successfully identified in position and throw. As mining proceeded a third element to the faulting was encountered. This comprised zones, up to 500 m wide and of some lateral extent, with complex normal and strike slip faulting. The vertical displacement is generally less than 5 m. These zones have been valled "shear zones" and because of their irregular shape and extent preclude mining over large areas.


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