New Zealand's South Island has moved westwards towards Australia by roughly 30cm, say scientists.
Last Wednesday's earthquake was the biggest to hit the country for 78 years and reached a magnitude of 7.8 on the Richter scale.
Ken Gledhill, a seismologist at GNS Science, said that the shift demonstrated how powerful the quake had been.
He told AFP news agency: "Basically, New Zealand just got a little bit bigger is another way to think about it."
The quake even saw the west coast of New Zealand experience a small tsunami.
Meanwhile, further reports suggest that further earthquakes might be felt elsewhere in the world in the near future.
Scientists say that a fault off the coast of Alaska could trigger a tsunami on the US' west coast that could be more devastating than that in the Indian Ocean in 2004.