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Post Info TOPIC: New Zealand Pumice Raft


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Pumice
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How X-rays Helped to Solve Mystery of Floating Rocks

It's true - some rocks can float on water for years at a time. And now scientists know how they do it, and what causes them to eventually sink.
X-ray studies at the Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) have helped scientists to solve this mystery by scanning inside samples of lightweight, glassy, and porous volcanic rocks known as pumice stones. The X-ray experiments were performed at Berkeley Labs Advanced Light Source (ALS), an X-ray source known as a synchrotron.

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Havre submarine volcano
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Underwater Kermadec Islands volcano research excites scientists

A world-first international expedition, including University of Otago researchers, is ending, after scientists gained striking new views of an underwater volcano in the Kermadec Islands.
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Havre volcano
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Havre eruption leads scientists to biggest undersea volcano

The eruption hypothesis was later backed up. Using data from the French Polynesian seismic network, the Laboratoire de Geophysique confirmed that frequent earthquakes of magnitude 3 to 5 had occurred between July 18 and July 21 that year at Havre submarine volcano, about 800 kilometres north-east of New Zealand.
Poring over comprehensive, high-resolution satellite images, the scientists subsequently confirmed the presence of gigantic rafts of silicic pumice, covering an area spanning roughly 400 square kilometres. They traced the rafts back in time to their source on July 18, when there was also evidence of an atmospheric plume, emitted from a point source, and a thermal hotspot.

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L

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Kermadec volcano
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First sighting responsible for undersea eruption

New Zealand scientists are investigating active undersea volcanos, north of New Zealand. New images reveal the impacts of a significant eruption on the seafloor.
NIWA research vessel Tangaroa has just mapped the Kermadec volcano that erupted 800 kilometres north east of Tauranga, on 19 July 2012, producing a pumice raft the size of Canterbury.

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Posts: 130044
Date:
New Zealand Pumice Raft
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Massive Rock Raft Found Floating off New Zealand

A mass of small volcanic rocks nearly the size of Belgium has been discovered floating off the coast of New Zealand.
The stretch of golf-ball-size pumice rocks was first spotted this week by a New Zealand air force plane about 1,000 kilometres northeast of Auckland. The rocks stretch for about 26,000 square kilometres.

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GNS Science vulcanologist Craig Miller told AAP that the Royal New Zealand Air Force has provided photographs of the pumice raft and New Zealand's National Maritime Coordination Centre has reported a sea disturbance 100 nautical miles long and 25 nautical miles wide, located 400km west of Raoul Island.
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