Cape Campbell, on the northeastern tip of the South Island, is almost 14 inches closer to Wellington, a major city on the southern coast of the North Island, than it was before the quake, she said.
Meanwhile, Kaikōura has moved about six inches east, and the coastal town of Blenheim has shifted northeast by the same distance.
Wellington itself has moved around two inches northeast.
Hreinsdóttir noted that it was difficult to determine which fault was mostly responsible for the movement, saying: “In reality we are having all these creepings going on and the question is, which is the dominant factor?”
GNS Science has monitored geological movements at several sites across New Zealand since the 2016 quake.
One fault, at Waipapa Bay, caused a vertical displacement of around three feet when it ruptured at a speed of around two miles per second.
The greatest slip occurred on the fault at Kekerengu, which appeared to slip around 30 feet along part of its length, Michael Blanpied, associate coordinator with the USGS Earthquake Hazards Program, said at the time.