DESPITE knowing the geographical area responsible for a spate of earthquakes hitting central New Zealand, scientists don't know exactly which fault is at fault.
That's why they're sending extra instruments to the Marlborough region to measure the continual string of aftershocks.
Nine GeoNet recording instruments will be deployed in the earthquake prone area to enhance the quality and quantity of data being recorded.
GNS Science seismologist Stephen Bannister said it was not clear if the current series of quakes is the product of a known fault or an unidentified fault.
"The more accurate data will help in understanding the ruptures that are occurring and how they are linked to nearby faults off the coast of eastern Marlborough," he said.
Scientists should have a clear idea of the size and geometry of the fault by the end of this week, which will allow them to assess stresses on other fault lines within a 15km radius of the ruptured fault line.
GNS Science says a 2008 earthquake report that maps the Cook Strait shows "a busy network of faults on the seabed".
The research institute says there remains a small possibility that quakes in the region could spark a tsunami and warns residents in coastal areas to seek higher ground if they feel shaking for more than 30 seconds.
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