Notes:

When shear slippage occurs, either at bed boundaries or induced shear planes, the fracture no longer assumes a nice elliptical shape. The local width becomes a function of local rock properties and stresses, and may no longer increase directly with frac height or length. The stresses transmitted to the fracture tip are also reduced because they are not concentrated over the entire fracture body. As a result, fracture containment improves and frac width may be less than previously expected.

The illustration of the expected fracture shape looks much more like those seen in borehole televiewer and image log pictures.