Alpine Fault runs across the image, and through centre of wall, J.Thomson / GNS.Science
It is worth looking at the wall to see how it has stood the test of time. As you can see it has not been damaged due to any fault movement or gradual creep (as of April 2016!), showing that the fault is stuck. In other words, movement will occur suddenly during an earthquake, rather than gradually. Most of New Zealand's major faults are similar in this respect.
If you walk along the trace of the fault near to the wall, and along the scarp towards the gravel road, you may be able to see how the landforms have been moved vertically and sideways along the fault. Using a pencil and paper to make a sketch map can help a lot to clarify which features match up across the fault. Estimate the amount of displacement of different features. Older features will have been displaced more than younger ones. See if you can notice any differences.