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11 January 2018 - Undersea volcanic eruption near New Zealand was largest in 100 years

Publié par Marion Coste le 11/01/2018

World's biggest deep-sea volcanic eruption in 100 years 'a scientific goldmine'
(The Sydney Morning Herald, 11/01/2018)

The world's largest deep-ocean volcanic eruption in the past century, which occurred near New Zealand, is a scientific goldmine, researchers say.

The volcano, named Havre, 1000 kilometres north-west of the country's North Island, was discovered in 2002.

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Underwater Volcano
Underwater Volcano Off New Zealand Spewd 150-Square-Mile Pumic Raft in Largest Eruption in a Century
Meghan Bartels (Newsweek, 09/10/2018)
A giant eruption in 2012 on the ocean floor near New Zealand was even larger than scientists realized at the time, a new analysis shows. In fact, it was the largest eruption of a deep ocean volcano in the past century. The study, which used robot submarines to probe the underwater volcano, called Havre, could reshape our understanding of what's happening beneath the Earth's surface. 

"We know virtually nothing about submarine volcanoes and eruption processes in the ocean, despite more than 75 percent of the Earth’s volcanoes being on the seafloor," lead author Rebecca Carey, a volcanologist at the University of Tasmania in Australia, wrote in an email to Newsweek.

Carey was focused on the more usual volcanic suspects—eruptions that take place on land—until (coincidentally) just before the eruption began. "Lucky for me, in 2012 Havre volcano erupted," Carey wrote. Havre, which had been discovered about 600 miles from New Zealand's North Island just a decade earlier, sent a plume from 700 meters below sea level to the surface. 

Undersea eruption near New Zealand was century's biggest
Jamie Morton (New Zealand Herald, 11/01/2018)
Scientists have shed new light on a powerful undersea eruption north of New Zealand that proved larger than any on land in the past century.

In a just-published study, researchers have pieced together the 2012 eruption of the seafloor Havre volcano, which lies in the Kermadec Islands, about 1000km off the North Island.

The 2012 blow - the largest deep-ocean eruption of the past century - was revealed when satellite imagery picked up a pumice raft spread across some 400sq km of ocean.

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New Zealand Volcanoes
'Massive' Kermadec eruption rivalled Mt St Helens - study
(Radio New Zealand, 11/01/2018)
An undersea volcanic eruption north of New Zealand in 2012 was roughly the same size as the Mount St Helens eruption in 1980, a new study says.

In 2012, 1000km off the coast of the North Island near Raoul Island in the Kermadec chain, a massive volcanic eruption spewed ash and rock into the deep ocean.

The region, the Tonga-Kermadec arc, is one of the most active in the world for submarine eruptions. A chain of underwater volcanoes runs south to north along the Kermadec trench to Tonga and has at least 30 volcanoes. Most of the volcanoes of the Kermadec region are comparable in size to Ruapehu and Taranaki.

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