Scientists hope research into the country's most active seismic risk area will help to better predict earthquakes.

The National Institute of Water and Atmospheric Research has mapped out fault lines through Cook Strait for the first time. It has found no connections between the major faults running through the North and South Islands, meaning a large earthquake would probably be contained to one island.

Ocean Geology Scientist Dr Philip Barnes says the new fault maps will prove very helpful and give scientists a better idea of the potential locations of future earthquakes and when they might occur. Dr Barnes says the information can be used to predict how an earthquake on one fault might affect another fault.