Earthquake | Canterbury

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More than 30 aftershocks quakes were recorded by Geonet since the major magnitude-6.0 quake hit the South Island at 6.48am, 6 January 2015, centred about 30km west of Arthur's Pass.

The largest struck at 12.23pm and was recorded by Geonet as a magnitude-4.7 aftershock, also west of Arthur's Pass and 5 kilometres deep.

Today's early morning jolt was initially thought to be centred on the Canterbury Plains, near Lake Coleridge. However, about 10.20am, seismologists issued a dramatic revision of the location and magnitude of this morning's earthquake which jolted thousands from their beds.

GNS Science spokesman John Callan said the latest information showed the quake was of magnitude 6.0, not the 6.4 reported earlier, and centred about 30km west of Arthurs Pass, close to where seismic equipment originally suggested, not 35 kilometres north of Methven, on the western edge of the Canterbury Plains. It was 5km deep, not 10km deep as earlier reported.

Trains from Christchurch to the West Coast and to Oamaru were cancelled and dozens of aftershocks recorded, but the Oamaru and other links had since reopened.

However, there have been no reports of significant damage.

The initial shake was followed by a swarm of more than 20 aftershocks in the area ranging in magnitude from 3.2 to 4.7, centred about 30km west of Arthurs Pass.

West Coast cafes may suffer loss of business

The cancellation of the TranzAlpine train between Christchurch and Greymouth was likely to be the biggest impact of the earthquake on the West Coast.

Robert Harris cafe owner Julie McGeady said there was no damage or items falling from shelves but the axing of the TranzAlpine would "absolutely affect us".

As one of the closest cafes to the train station, "we can get 80 odd people off the train, if not more," McGeady said.

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