A second magnitude 4 earthquake shook Christchurch today.

The 4.0 quake, located 5km from Christchurch hit at 7.31pm, 10km deep.

The quake was described as "noisy" by tweeting residents.

This morning a 4.2 magnitude quake shook residents awake about 5.15am.

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A 3.4 tremor also struck the city about 8am.

- NZPA