There has been a series of early morning earthquakes in Turangi and Marlborough.
Marlborough was shaken by a 4.5 magnitude earthquake.
The quake, which struck at 12.11m, was located 30km south of St Arnaud at a depth of 110km, GNS Science said.
Around the same time, two mild but shallow tremors hit Turangi just after midnight.
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While they were only 2.8 and 3.6 on the Richter scale, they were at four kilometres deep and were felt by residents.
