Tech & Science Little-known eruption near NZ the biggest in 100 years

02:35  11 january  2018
02:35  11 january  2018 Source:   MSN

Ash eruption from Philippines volcano triggers evacuation

  Ash eruption from Philippines volcano triggers evacuation An active volcano in central Philippines spewed ash into the air on Saturday, prompting the country's disaster agency to order the immediate evacuation of residents in nearby villages. The Philippine Institute of Volcanology and Seismology (Phivolcs) said it was closely monitoring the Mayon volcano in Albay province, which last erupted in 2014.Mayon's most destructive eruption was in February 1841, when lava flows buried a town and killed 1,200 people.

A deep sea volcano near NZ caused such a huge eruption that it produced a 400 square km "pumice raft". University of Tasmania volcanologist Dr Rebecca Carey said: "We knew it was a large scale eruption , approximately equivalent to the biggest eruption we've seen on land in the 20th Century.

Tarawera, New Zealand . Over a year ago. by Erik Klemetti. After the 1300 A.D. eruption , there is little evidence for eruptive activity (beyond phreatic explosions) in the Tarawera region. Waimangu Geyser in New Zealand seen in 1903-4. So, now you know what happened near Tarawera in that

A two-year study has been carried out into the eruption. © Supplied A two-year study has been carried out into the eruption.

Scientists studying a little-known volcano off the coast of New Zealand now believe its 2012 eruption was one of the biggest the world has seen in the last 100 years.

The Havre volcano, on the floor of the Pacific Ocean about 1000km northeast of the North Island, was only discovered in 2002. Its 2012 eruption went unnoticed until a Kiwi woman saw something strange while flying home from Samoa.

a close up of a map © Provided by MediaWorks NZ Limited

"I took a couple of pictures, wondering if it was an algal bloom, oil spill or, recalling a conversation with a friend the week before, a deposit from a volcano," artist Maggie de Grauw told the Waikato Times in 2013.

Lava flowing from Philippine volcano, thousands evacuated

  Lava flowing from Philippine volcano, thousands evacuated More than 9,000 people have evacuated the area around the Philippines' most active volcano.© The Associated Press In this image made from video, dark pyroclastic ash cloud rises from Mayon volcano after its eruption as seen from Legazpi city, Albay province, around 340 kilometers (200 miles) southeast of Manila, Philippines, Monday, Jan. 15, 2018. More than 9,000 people have evacuated the area around the Philippines' most active volcano as lava flowed down its crater Monday in a gentle eruption that scientists warned could turn explosive.

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A week later, the massive deposit of ash and pumice was found by an Air Force Orion crew, and satellite imagery soon showed it was 480km long and about 50km wide - bigger than Israel.

Researchers from the University of Tasmania and around the world have spent the past two years investigating the eruption, and now think it was one to rival the biggest we've seen in recent history.

"We knew it was a large scale eruption, approximately equivalent to the biggest eruption we've seen on land in the 20th Century," said volcanologist Dr Rebecca Carey, who led the study.

"The eruption was very complex, involving more than 14 aligned vents that represent a massive rupture of the volcanic edifice."

  Little-known eruption near NZ the biggest in 100 years © Provided by MediaWorks NZ Limited

The pumice - solidified lava filled with air bubbles - ended up on beaches across the Pacific, including New Zealand and Australia.

Lava flowing from Philippine volcano, thousands evacuated

  Lava flowing from Philippine volcano, thousands evacuated More than 9,000 people have evacuated the area around the Philippines' most active volcano.© The Associated Press In this image made from video, dark pyroclastic ash cloud rises from Mayon volcano after its eruption as seen from Legazpi city, Albay province, around 340 kilometers (200 miles) southeast of Manila, Philippines, Monday, Jan. 15, 2018. More than 9,000 people have evacuated the area around the Philippines' most active volcano as lava flowed down its crater Monday in a gentle eruption that scientists warned could turn explosive.

After all, though there have been 25 " little " volcanic eruptions in the central North Island in geologically recent times, it is 1800 years since the last big one. The Taupo she refers to is the Taupo eruption of 1800 years ago, which is still considered the most violent known in the world in the last 5000 years .

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Ms de Grauw even found some herself six months later, which she turned into jewellery.

The eruption wasn't good news for local wildlife however, and Dr Carey says biologists are "very interested to learn more about how species recolonise, and where those new species are coming from".

"There is a decade worth of interdisciplinary science to do based on our 2015 voyage data and samples. It's very exciting to marry the geosciences with other scientific disciplines addressing novel research questions."

The study was published Thursday in journal Science Advances.

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