Rock Deformation The change in volume or shape of an object that results from stress is called strain The response of rocks to stress can be divided into elastic response: rock returns to original shape ductile or plastic response: permanent deformation without fracture occurs above the SO-called elastic limit brittle response: fracturing of a rock with little deformation prior to its rupture Rock Deformation The propagation of seismic waves through rocks is an elas- tic response, since the rocks return to their original shape. Ductile(plastic)response of rock layers results in folds permanent wavelike deformations in layered rocks Brittle response to stress results in faults=a fracture in bedrock along which rocks on one side have moved relative to the other side. Where such movement is absent. the fracture is called a joint(several joints=joint sets The rock response to stress is influenced by a number of factors: type of stress, type of rock, temperature, pressure, fluids, length and magnitude of stress applied2 Rock Deformation The change in volume or shape of an object that results from stress is called strain. The response of rocks to stress can be divided into - elastic response: rock returns to original shape - ductile or plastic response: permanent deformation without fracture; occurs above the so-called elastic limit - brittle response: fracturing of a rock with little deformation prior to its rupture Rock Deformation The propagation of seismic waves through rocks is an elas￾tic response, since the rocks return to their original shape. Ductile (plastic) response of rock layers results in folds = permanent wavelike deformations in layered rocks Brittle response to stress results in faults = a fracture in bedrock along which rocks on one side have moved relative to the other side. Where such movement is absent, the fracture is called a joint (several joints = joint sets) The rock response to stress is influenced by a number of factors: type of stress, type of rock, temperature, pressure, fluids, length and magnitude of stress applied