Swarms of bloodthirsty eels advancing in the crevices on the acme of Nafanua. Scientists dubbed this armpit “Eel City.” Angel address of Vailulu’u 2005 Exploration, NOAA-OE. Download angel (jpg, 88 KB).
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During the 2017 American Samoa expedition, scientists achievement to conduct a accidentally operated agent dive at Vailulu’u Seamount, acclimate permitting. In apprehension of the dive, NOAA Ship Okeanos Explorer resurveyed the seamount’s acme several canicule ago application the ship’s multibeam alarm to attending for bathymetric changes back the aftermost time the seamount was mapped. You see, Vailulu’u is an alive abysmal abundance and is accepted to be restless.
Using the submersible Pisces during an campaign to Vailulu’u in 2005 that was additionally accurate by the NOAA Office of Ocean Exploration and Research, the abundance was begin to accept erupted a new cone in its acme caldera. Scientists alleged the new cone “Nafanua” for the Samoan goddess or war. The atrium was begin to be hydrothermally alive at assorted sites and some areas were abundant with life, like a armpit alleged “eel city” at the acme of Nafanua cone.
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Other areas, like the abysmal caldera attic surrounding Nafanua, were alleged “the moat of death” because the anarchic and acerb amnion there were allegedly baneful to best abyssal life.
A alias of bubbles is apparent ascent from the seafloor at Vailulu’u Seamount in the mid-water multibeam alarm data. Angel address of the NOAA Office of Ocean Exploration and Research, 2017 American Samoa. Download beyond adaptation (jpg, 359 KB).
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The 2017 multibeam alarm analysis conducted by the Okeanos shows two amazing things. First, there is a arresting alias of bubbles (probably carbon dioxide) ascent from the breadth that was ahead alleged the Northern Moat Hydrothermal Complex. This alias indicates there are gas-rich hydrothermal fluids actuality emitted on the seafloor in that area. The alias will accomplish a acceptable dive ambition if we are able to conduct a Abysmal Discoverer dive at the seamount.
Second, there accept been above abyss changes in the acme caldera of Vailulu’u back the 2005 expedition. The 2017 bathymetric analysis shows that Nafanua cone has developed both in acme and abnormally in amplitude back 2005, no agnosticism due to continuing agitable activity.
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Maps comparing three bathymetric surveys calm at Vailulu’u in 2006, 2012, and 2017 (left) and abyss comparisons amid them (right). Red areas appearance absolute abyss changes due to eruptions at Nafanua cone amid the surveys. Angel address of of Susan Merle, Oregon State University and NOAA/PMEL. Download beyond adaptation (jpg, 2.9 MB).
By comparing surveys calm in 2006 and 2012, we can additionally see that Nafanua cone has developed during all of the time intervals – either boring and continuously or conceivably during assorted alert events. These episodes of advance are abiding to accept acquired above changes in the hydrothermal systems and their chemosynthetic ecosystems in the acme caldera.
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But what will these changes be? We won’t apperceive until we go exploring! All this affirmation for contempo action and change at Vailulu’u is creating abundant apprehension aural the science team. We can’t delay to see what added surprises Vailulu’u has in abundance for us!
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