Why New Zealand Great Earthquake?

Rifanews. 6.3 Richter scale earthquake in New Zealand have very widespread and destroy areas close to the center point. Why is it so destructive?

A lecturer at the University of Canterbury Earth Sciences Professor John Townend told Radio New Zealand, seismic event on Tuesday (22 / 2) is linked with the previous earthquake on September 4, 2010.

"Aftershocks does not end just like that and one of them can indeed be a big earthquake," he said.

One of the cities most severely affected are Christchurch. The composition of this city is mud, sand and gravel with water table at the bottom. When an earthquake, and the water rose and mixed with sand.

News previously mentioned, the center of the quake is 40 km from Christchurch. But experts predict, that point is 20 km at a depth of five kilometers. Vibration felt up to the Capital City of Wellington and Dunedin.

Residents said that tremors lasted under a minute. The quake also was the biggest since an earthquake measuring 7.1 magnitude on September 4, 2010 and then

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