![The remains of a damaged house hang on a cliff at Sumner, Christchurch, after earthquakes - magnitude 6.0 and 5.5 - struck on Monday. [Getty Images]](http://www.abc.net.au/reslib/201106/r783000_6752853.jpg "The remains of a damaged house hang on a cliff at Sumner, Christchurch, after earthquakes - magnitude 6.0 and 5.5 - struck on Monday. [Getty Images]")
Citizens of the New Zealand city of Christchurch have endured a night of aftershocks after tremors on Monday of up to magnitude 6.
The largest aftershock overnight was a magnitude 4.7 tremor which woke many people just before 2.45am on Tuesday.
One quarter of householders awoke to a frosty morning in Christchurch still without power.
Energy company Orion says it hopes to have all homes and businesses connected by the end of the day.
About 10 per cent of houses are still without mains water.
Roads
Clean-up crews are beginning the huge task of clearing roads in the eastern suburbs of silt and flooding.
The mayor, Bob Parker, says there has been significant extra destruction to buildings in the city centre.
Engineers are likely to take several days to assess the damage.
News agencies report two people were rescued from a collapsed building in the rolling aftershocks.
The new tremors came as the Prime Minister, John Key, reaffirmed a commitment to rebuild the city, which was extensively damaged in February, when 181 people were killed.
The GeoNet agency published a list of the last 30 earthquakes to hit the Canterbury area around Christchurch, which is on the South Island. They indicate the close spacing of tremors from and including Monday.
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