Marlborough Mayor John Leggett says property damage appears to be more widely dispersed across the district than during the previous Seddon earthquakes.
But it is still too soon to get an accurate picture of the destruction, he said.
"Our civil defence volunteers, fire crews and Red Cross teams are out there now, making their way around the areas we believe to be worst affected," Leggett said.
"We know there has been significant damage and many people will be feeling very stressed because aftershocks are continuing and that may go on for a while yet."
Leggett spent the first five hours after the midnight earthquake at Marlborough's emergency headquarters in Blenheim.