Canterbury has received 270 aftershocks of magnitude 3 or above so far since Saturday's earthquake, according to GNS Science.
However, seismologist Brian Ferris said people would have felt about 150 of those aftershocks.
About 10 aftershocks were between magnitude 5 and 5.5, 60 between 4 and 4.9 and 200 between 3 and 3.9, he said.
Since midnight there had been 18 aftershocks.

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