"At this stage, it seems okay. But it got dark not long after the quake, so we'll be checking it again [today]," Mr Stevens said.
Wanganui residents took to Facebook to share their experiences of the quake.
Barbara Haddock said it was one of the biggest quakes she had felt. "Pretty scary to feel your lawn moving under your feet, power lines shaking and trees moving without wind."
Bethan Check of Springvale said she had suffered no damage "but all my hanging baskets were having a big swing, also trees and power lines". Linda Dowdle said her nerves were "shot to hell".
The reinforced concrete Chronicle building in Taupo Quay shuddered and swayed enough to make the three journalists on duty apprehensive.
A Wellington resident contacted by the Chronicle said the quake was heard first as a slow rumble followed "by a really big jolt" that with the shaking continuing for another 10 seconds or so.