Volcano's legacy still washing up on beaches

Dec 13, 2013
Pieces of pumice from the same volcanic eruption that caused the largest pumice raft seen in 50 years have continued to wash up on Queensland shores this week.The pumice was a result of the eruption of an underwater volcano known as Havre Seamount, 1000 km north of Auckland in July 2012. Dr Scott Bryan from QUT's Science and Engineering Faculty has been collecting and studying the pumice since a raft of the porous volcanic rock was first spotted by a passenger while flying from Samoa to New Zealand two weeks after the eruption.

Pieces of pumice from the same volcanic eruption that caused the largest pumice raft seen in 50 years have continued to wash up on Queensland shores this week.

The pumice was a result of the eruption of an known as Havre Seamount, 1000 km north of Auckland in July 2012.

Dr Scott Bryan from QUT's Science and Engineering Faculty has been collecting and studying the pumice since a raft of the was first spotted by a passenger while flying from Samoa to New Zealand two weeks after the eruption.

"This volcano was discovered only a few years ago and so little is known about it," he said.

"The summit sits about 700 m below sea level so it would have taken quite a lot of power to force the pumice up to the surface of the ocean. We are also looking at how big these pieces of pumice are and the amount that we are seeing washing up gives us an idea of the magnitude of the eruption."

Since the discovery of the pumice raft, which was also seen early on via satellite imagery, pieces of the rock have washed up in New Zealand, Tonga, Fiji and along the eastern seaboard of Australia from as far north as the Torres Strait to Victoria. The most recent finds have been in South East Queensland, Townsville and the Whitsundays.

"It's not unusual for pumice rafts to wash onto shore for up to a year after the first strandings which were in March this year," Dr Bryan said.

"The pumice is essentially the only record we have of the eruption. It can help us to understand more about the nature of the volcano as well as how these volcanoes erupt explosively under so much water."

While finding a piece of volcanic history on the beach is fun, Dr Bryan said the pumice does pose a safety issue for boats.

"The can be a navigational hazard," he said.

"We have had reports of it blocking and damaging water intakes for engine cooling systems on boats, which have had to be replaced, and so it can have a significant financial impact as well."

Explore further: A hitchhiker's guide to pumice

add to favorites email to friend print save as pdf

Related Stories

A hitchhiker's guide to pumice

Sep 02, 2013

A floating raft of pumice created by an underwater volcanic eruption near New Zealand, and teeming with marine hitchhikers, has been spotted in the northern Great Barrier Reef.

Bizarre rock 'ice shelf' found in Pacific

Aug 10, 2012

A huge cluster of floating volcanic rocks covering almost 26,000 square kilometres (10,000 square miles) has been found drifting in the Pacific, the New Zealand navy said Friday.

Research team discovers third type of volcanic eruption

Jan 21, 2013

(Phys.org)—A team of researchers from New Zealand's Victoria University has discovered what its members believe to be, a third type of volcanic eruption. In their paper published in the journal Nature Ge ...

Rock rafts could be 'cradle of life'

Sep 02, 2011

(PhysOrg.com) -- Floating rafts of volcanic pumice could have played a significant role in the origins of life on Earth, scientists from Oxford University and the University of Western Australia have suggested.

Recommended for you

NASA sees Genevieve squeezed between 3 tropical systems

1 hour ago

The resurrected Tropical Depression Genevieve appears squeezed between three other developing areas of low pressure. Satellite data from NOAA and NASA continue to show a lot of tropical activity in the Eastern ...

User comments : 0