Largest Underwater Eruption Discovered off NZ

Researchers have found that the world’s largest deep ocean volcanic eruption happened 1000km north east of New Zealand.

Named as Havre, the deep ocean volcanic eruption was first discovered in 2002. A solidified volcanic rock known as pumice raft – 400 km2 in size – found floating in the ocean near New Zealand in 2012 showed that underwater eruption had occurred.

The eruption involved 14 aligned vents causing a “massive rupture”.

“When this rock was produced by the volcano, it rose through the water column onto the sea surfaced and then it was dispersed by wind and sea currents,” lead author Rebecca Carey, volcanologist at the University of Tasmania, said.

“We knew it was a large scale eruption, approximately equivalent to the biggest eruption we’ve seen on land in the 20th century,” Carey added.

For the study, the team successfully mapped the remote location with submersible vehicles including a remotely operated vehicle and an automated underwater vehicle to make high-resolution topographic maps of the sea floor.

With more than 80 per cent of the world’s volcanoes located underwater, scientists like Carey believe it’s vital to learn more about them.

“Volcanoes provide heat and chemicals to the ocean and that input is actually really important when it comes to sustaining life,” she said.

“Havre is a cornerstone eruptive event because for the first time we are able to constrain exactly what happened, where it happened, at what depth, how much and how fast it erupted.”

The study, the largest deep ocean silicic volcanic eruption of the past century, was published online in Science Advances.

Original article by The Economic Times, January 11, 2018.


Tags: Economic Times (The)  Havre  pumice raft  Science Advances  volcanic eruption  

Helen Clark Lays Out Her Reasons for Legalising It

Helen Clark Lays Out Her Reasons for Legalising It

In an opinion piece for the UK’s Guardian newspaper, former prime minister and member of the Global Commission on Drug Policy Helen Clark explains why a ‘yes’ in next year’s referendum…