Two magnitude 4.7 aftershocks have struck within the past half hour.
The latest was 25km southeast of Seddon at 12.39pm.
The moderate quake, 26km deep, was strongly felt in Wellington.
It comes after a 4.7 quake 20km northeast of Kaikoura at 12.13pm.
The strong quake was 15km deep.
Two aftershocks felt as far north as Wellington
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