Quake map details extent of aftershocks

By Paul Harper

The aftershocks recorded by GNS Science. Image / GNS Science
The aftershocks recorded by GNS Science. Image / GNS Science

More than 11,200 aftershocks have been recorded by GNS Science since the first Canterbury earthquake, two years ago today.

The magnitude 7.1 earthquake struck 11km beneath Darfield at 4.35am on September 4, 2010.

The tremor caused widespread damage across the Canterbury region, however fortunately there were no fatalities.

Since then, thousands of quakes have rattled the region, the most damaging a magnitude 6.3 on February 22 last year, which claimed 185 lives.

In the past two years there have been 54 aftershocks between magnitude 5 and 5.9, and three between magnitude 6 and 6.9.

The size and frequency of the quakes has slowly decreased; The last tremor over magnitude 5 struck on May 25 - a 5.2 magnitude jolt centred off the coast, 10km east of Belfast at a depth of 11km.

In the year from August 9 to August 8, 2013, GNS Science forecasted there is a 74 percent probability of a magnitude 5-5.4 earthquake striking, a 32 percent probability of a magnitude 5.5-5.9 quake, a 10 percent chance of a 6-6.4 quake, a 3 percent chance of a 6.5-5.9 quake and a 1 percent chance of a 7-7.9 quake.

- Herald Online

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