People in Canterbury are being warned of more earthquakes and aftershocks for years to come.
The Natural Hazards Manager at GNS Science, Kelvin Berryman, says it is impossible to tell for sure how long the aftershocks will continue.
But he says previous earthquakes, in this country and overseas, have been followed by seismic activity for up to 30 years.
Dr Berryman says while the current sequence of aftershocks will eventually drop off, there is a possibility it could trigger further earthquakes, beginning the cycle again.
