What does Anderson’s Model Predict ?

3 types of faults based upon relative movement of the hanging wall - normal, reverse and strike-slip.
60° dip for normal faults, 30° dip for reverse faults and 90° dip for strike-slip faults (Fig. 1). Its worth reading Fossen (2016, [1]) to get more background on this.
Conjugate sets of faults - a pair of faults of common origin but dipping in the opposite direction (Fig. 2).

Fig. 1. Faults classification based upon relative movement of hanging wall to footwall. Thicker red arrows mean higher value of principle stress.

Do we see these characteristics in Outcrop ?

Yes, most outcrops are faulted, variably by the 3 types of fault.
Conjugate faulting is common in outcrop. The normal faults in Fig. 2 form a series of conjugate sets - a faulted pair, both dipping at 60° (and separated by a 60° angle) but in opposite directions.
Note that despite a common origin, cross-cutting relations show us that the left dipping fault is younger than the right dipping fault. In fact these faults are zones of deformation bands - note the wider compound zone in the foreground of Fig 2.
Another example in Fig 3. is of conjugate faults in mudstone superimposed upon closely spaced background (decompaction) joints.

Fig. 2. Conjugate faults (zones of deformation bands) in outcrop (Hopeman Sandstone, UK). Note compound zone of deformation bands (dashed line) in the foreground. Anderson’s model shown on the right.

Fig. 3. Network of conjugate shear fractures/faults superimposed upon closely spaced background joints. Cromlix mudstone (Dev.), Stanley, Perthshire, UK. Scale (car keys) circled).

What about interpreting seismic data ?

It’s important to bring Anderson’s model to the fore of any seismic interpretation. For example if a normal fault does not have a 60 deg. dip then it must have been rotated or there is a mechanical explanation (plane of weakness). The latter is because the Anderson model does not predict low angle faults - which may initiate due to a pre-existing anisotropy such as a weak salt layer.

Key Takeaways

Faults are usually classified on the basis on relative movement of the hanging wall to the footwall, into (i) normal, (ii) reverse and (iii) strike slip faults.
Anderson’s model also predicts a 60° dip for normal faults, 30° dip for reverse faults and 90° dip for strike slip faults.
All of these fault types can display conjugate geometries as illustrated by normal faults in outcrop here. Not only do normal faults initiate at 60° but the 2 faults are separated by 60°.
Anderson’s model does not predict low angle (<< 60°), therefore low angle faults interpreted on seismic must have have a structural geological explanation e.g., rotation.