Magnitude 4.3 knocks power out

Power was knocked out to some Christchurch homes after a magnitude-4.3 aftershock this afternoon.

The nine-kilometre-deep quake struck within 5km of Christchurch, around Somerfield, at 12.13pm.

It was felt throughout the city, with some Twitter users describing a ''loud rumble'' followed by up to 20 seconds of shaking.

GeoNet users reported feeling the tremor as far away as Akaroa, Cust, Greta Valley and Hawarden.

Lines company Orion said power was knocked out in Belfast, Marshland, Brooklands and Spencerville.

It was restored at 1.20pm.

It was the fifth aftershock felt in Christchurch today.

A magnitude-3.3 shake struck within 5km of Lyttelton at 3.31am, at a depth of 8km.

It was followed by a 3.2 quake in the same area at 3.42am, at a depth of 6km.

A 3.5 quake hit 20km west of Christchurch at 5.55am, at a depth of 7km, and a 3.7 quake hit 10km southwest of Christchurch at 7.18am, at a depth of 7km.

The Press