A fracture is a general type of discontinuity that is crucial from geotechnical point of view. It's a natural breakage in a rock mass and along its plane, there may or may not have been any displacement. Fractures differ from joints from a structural geology point of view. Joints have little or no displacement. 

Fracture intensity refers to the number of fractures in a given rock mass. It is often denoted as P32 which is the area of fractures per unit volume.