I have an ongoing interest in the Western Segment of the Greendale fault, west of the Waianiwaniwa River, particularly between the Selwyn and Hororata Rivers,
The West Segment
The West Segment of the Greendale Fault operated as a releasing right bend during the Darfield earthquake. It slipped with a dextral-normal sense, feeding rock toward the Charing Cross Fault.
Much of the story is told in a GSA Bulletin paper in 2013. Duffy et al. (2013) resolved the kinematics and interactions of linking faults (the West Segment, Central Segment and Charing Cross faults) using a fortuitous dataset consisting of recent cadastral surveys, mapping of floodwaters using oblique aerial photography, and a beautiful bit of differential Lidar at the cusp of the bend.
The rest of the fault