Lake Taupō's 5.7 magnitude earthquake causes over 680 aftershocks

There have been over 680 aftershocks following the 5.7 magnitude earthquake at Lake Taupō last month.

On Wednesday, GeoNet said on its website there have been hundreds of aftershocks after the 5.7 magnitude earthquake on November 30. The most recent aftershock was a magnitude of 3.4 on December 12.

GeoNet said the number of aftershocks is what they would've expected after an earthquake of that magnitude. 

It has also increased the magnitude of the earthquake by 0.1 units from a magnitude of 5.6 to 5.7.

"You'll likely notice the reported magnitude has increased since our initial reporting by 0.1 units to 5.7. This reflects the greater accuracy we have been able to bring to the earthquake analysis since the earthquake happened," GeoNet said on its website.

The 5.7 magnitude earthquake also generated a small tsunami, which caused the beach at Wharewaka Point to retreat by around 20 metres and the possibility of an underwater landslide.

GeoNet reported the earthquake caused waves to travel across the lake and surged a few metres across several beaches in the area.

More than 30 landslide events were caused by the Lake Taupō earthquake, with the larger ones in Hatepe.

GeoNet reported its Global Navigation Satellite System (GNSS) instruments measured ground movement around Lake Taupō.

"Our instrument at Horomatangi reef (TGHO) moved 18cm upwards during the earthquake and 25cm to the southeast, which is the largest ever recorded ground movement at this location," GeoNet said on its website.

Over the next 30 days, GeoNet has estimated there is an 11 percent chance of another earthquake with a magnitude of 5 or above in the Taupō area.