Scientists believe it is at least 16,000 years since the last rupture of the hidden fault that caused Saturday's magnitude 7.1 earthquake and generated the strongest ground-shaking ever recorded in New Zealand.
By last night more than 90 significant aftershocks had rattled Canterbury since the shock that produced major damage to parts of Christchurch and the region.
Yesterday's frequent quakes were generally between four and five in magnitude. Some were felt as sharp jolts because they were as shallow as 4km below the surface and only 10km from the centre of Christchurc
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