New Zealand Alpine Fault

South Island New Zealand is getting longer. Active uplift is creating the alpine topography. There is a total of 480 km offset in the last 15-20 million years. Link to geologic map of New Zealand.

USGS map showing New Zealand's position in a transition from oblique subduction to transpression (North Island to South Island) .

Image from USGS showing some first motion studies on earthquakes along the Alpine fault zone. Note that while most of them are dextral strike-slip, the one in the south is slightly oblique thrusting, consistent with a transpressive setting. This is a snap shot of recent movements on this long-lived fault. Many associated fault strands are not shown here. Map source:

Image from south end of the Alpine fault, showing first motins ( and also relative plate motion). Note the mixed kinematics of oblique thrusting and dextral strike slip in the same region. The earthquake epicenters are mostly on the southeast side because the Alpine fault dips that way. Image source: .

Larger view of continuation of plate boundary to the south. Notice the distribution of earthquakes in the oceanic crust suggesting non-rigid behavior.