In New Zealand, a series of strong aftershocks from a September earthquake has rattled Christchurch. The most powerful tremor was 4.9 magnitude and its impact was magnified by its proximity to the city centre. GNS Science monitoring agency said, it struck at 10.30 a.m. local time today within Five Kilometers of Christchurch at a depth of 12 kilometers. Buildings were damaged, power supplies temporarily cut and a large shopping centre was evacuated. The city was hit by a 7.1 magnitude earthquake three months ago, causing widespread destruction. Scientists say the tremors which continue to shake the area are related to the September quake and warn they could continue for some time.