f Explosive Source 3D Seismic and its Impact on the Geology of the Selby Coalfield

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.