A 4.6 magnitude earthquake has rocked the top of the South Island and lower North Island.

The quake struck 30km away from Seddon, at a depth of 12km, at 4.10pm.

GeoNet has classified the quake as 'moderate', however a few people have reported its strength as extreme, severe or strong.

More than 3000 people have reported feeling the quake - from as far away as Dunedin and as far north as Auckland.

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However, the majority of the felt reports are located around Blenheim and Wellington.

In 2013, Seddon was rocked by a 6.5 earthquake which caused damage across the Marlborough and Wellington areas, followed by several aftershocks.