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Fredrik Fransson and his uncle Hakan Larsson were delivering Fransson's CBN 36-ft yacht from Brisbane Marina in San Francisco to Brisbane, Australia, while they encountered a raft of pumice so dense their speed dripped from 7 knots to 1 node.
Read on
An Overview of the Taupo Volcanic Zone
European Discovery and Exploration of the Cook Islands
Island Habitats and Island Mammals
What namely Pumice Stone?
The colossal raft of pumice, which was apparent from space, was built by a volcanic outbreak south west of Late Island portion of the big district of volcanism known for the Pacific Ring of Fire . The considerable seismic movement in the place of Late Island is interlocked to the Home Reef volcano .This volcano final fashioned one island in 1984.
Pumice is a volcanic rock that is quite light and porous. It contains hollow vesicles which include volcanic gasses formed during the eruption. This makes the rocks buoyant enough to be able to drift on the surface of the sea until the gas leaches out and water gets in, at which time they will sink to the base of the ocean.
References:
Imagine how bizarre it was because the crew of the Yacht Maiken to come across a field of movable sand near the Tongan Island team of Vavau. It was the first clue that there were stirrings on the layer of the ocean as globe prepared to create a new island.
They rightly guessed that this raft of pumice narrated to an area of recent volcanic activity approach Tonga. Making their access to 18 degrees 15' 5" S, 174 degrees 46' 3" W [link widoczny dla zalogowanych], they base a volcano had crested the surface of the ocean and was spouting smoke, ash and pumice. They rightly too surmised that they were the first folk on the planet to witness this phenomenon which occurred on 12th August 2006.
Stunning Imagesof Pumice Rafts
First Witnessesof New Island
History Repeating Itself
Ian Wright, a maritime geologist from the National Institute of Water and Atmospheric Research in Wellington [link widoczny dla zalogowanych], New Zealand, annotated that prevailing currents and waves corrode such pumice and cinder isles down to almost 10 to 40 meters beneath the surface. A similar cycle of institution and dispose had happened in 1984. He went above to say that the volcano would probably reiterate this cycle every 10 to 200 years.
The 1st picture below was taken on September 15 2006 by a NASA satellite - about a month behind the eruption - and shows the new volcanic island and the pumice raft to the northwest of Late Island. A track of pumice connects the raft to Late Island. Other images were taken by the crew of the yacht Maiken as they steered through the dense raft of pumice stones.
Fredrik Fransson and Håkan Larsson, Yacht Maiken, 32 Macrossan St., Unit 70, Brisbane 4000, Australia [link widoczny dla zalogowanych], To visit their Weblog