Image: USGS

An earthquake with a reported 7.9 magnitude hit New Zealand’s South Island around 12.02am local time. Devastating aftershocks and tsunamis quickly followed. It’s possible that more aftershocks are to come and casualties are difficult to determine at this time.

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A warning was issued in advance and citizens were urged to seek high ground and take the necessary precautions. Those living along 200 miles of coastline were evacuated. Despite damage to the roadways, most people were able to reach safety.

New Zealand’s Prime Minister, John Key, reportedly confirmed two deaths at a news conference but figures for injuries or casualties will take time due to the fact that the areas hit hardest have impassable roadways.

A large fissure runs along Kaikoura Road about two hours north of Christchurch. Photo: AP

The earthquake hit about 50 miles north of the town of Christchurch, which was previously struck by an earthquake measuring 6.3 back in 2011. In that case, 185 people were killed and 164 were injured. Dan Jaksa, a duty officer from Geoscience Australia, told the New York Times, “Every time you go up one magnitude, say from 6.3 to 7.3, it is 32 times larger in terms of the energy released.” That would mean that this quake was 40 to 50 times larger than the previous one that hit Christchurch.

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Information is constantly shifting at the moment. The United States Geological Survey initially pegged the earthquake as a 7.4 but has now revised that number to a 7.8 measurement.

The truck loading ramp at the Interisland Ferry wharf lays dropped and broken, in Wellington. Photo: AP

Thus far, building damage has been reported as minimal, including water damage from the six-foot surges of seawater.

The Guardian reported around 9 am EST that another 4.4 quake shook the region near Kaikoura. It’s unclear if more are to come.

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Jaksa explained the timeline of the disaster to The New York Times:

After the initial 7.9 shock, there was an aftershock measuring 6.1, and then several more shocks, with three of those measuring in the high fives, he said. The earthquake occurred in the Hikurangi Trench, a subduction zone where one tectonic plate slides under another.

New Zealand’s North Island and the northern part of New Zealand’s South Island are on the Pacific plate, which is moving west, while the Australian plate is largely moving north. “This is the zone where the Pacific plate goes underneath the Australian plate,” Mr. Jaksa said, adding that the shift had caused a change in the seafloor that resulted in tsunami waves.

“Let’s hope this is it, and there’s no more,” Jaksa said.

Groceries litter the aisle at the New World, in Miramar area of Wellington. Photo: AP