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Post Info TOPIC: Brothers Volcano


L

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RE: Brothers Volcano
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Painting with sonar, each brushstroke a ping of sound reflected off the seafloor, the robotic underwater vehicle called ABE created a masterpiece of a landscapeone that is submerged about a mile deep in the Pacific Ocean.
On an international expedition last summer, scientists from Woods Hole Oceanographic Institution (WHOI) turned the sonar data collected by ABE (the Autonomous Benthic Explorer) into a richly textured three-dimensional seascape of the cantankerously cratered Brothers volcano, roughly 290 nautical miles (537 kilometres) northeast of New Zealand.

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The NZASRoF07 Kermadec Arc expedition departed from Auckland Harbour, heading up the Ngatoro Rift Basins and on to Brothers Volcano. The bathymetry fly-through begins over the North Island of New Zealand, then heads northeast over the Ngatoro Rift Basins, turns east and then north flying over the Kermadec Arc submarine volcanoes. The flight path continues north to Brothers caldera, turns around and looks south over the arc and backarc with New Zealand in the background. The bathymetry data consist of multibeam data (GNS) overlaid on satellite altimetry (Smith and Sandwell), and are exaggerated 2.5 times. Brothers submarine volcano is host to the most active and possibly largest of any hydrothermal vent fields discovered to date along the Kermadec Arc. The three-dimensional image depicts Brothers, looking toward the northeast. Depths in this image range from 1,205 to 2,835 meters. The bathymetry is 2.5 times vertically exaggerated. The high-resolution EM300 bathymetry data (25-meter grid cell size) used to create the image are proprietary, courtesy of New Zealand National Institute of Water and Atmospheric Research (NIWA). Movie courtesy of the NOAA Vents Program

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Unmanned vehicles will fly into the crater of an offshore volcano during the next three weeks to map it at high precision and search for possible mineral deposits.
In a New Zealand-led mission that has parallels to planetary exploration, two state-of-the-art robotic underwater vehicles will be deployed from the German research ship Sonne to gather an unprecedented amount of information about Brothers volcano, 400km northeast of White Island in the Bay of Plenty.

brotherVol
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Latitude:, 34.875S . Longitude:, 179.075E


The submarine Brothers volcano, located NE of the Healy submarine volcano, contains an oval-shaped summit caldera 3-3.5 km wide. The volcano is elongated in a NW-SE direction, and the high point of the dominantly dacitic volcano lies on the NW caldera rim at about 1350 m below the sea surface. The caldera floor is at about 1850 m depth, and a post-caldera lava dome was constructed on the southern caldera floor and partially merges with the southern caldera wall. Brothers volcano displays major submarine hydrothermal activity, including a large field of black smoker vents on the NW caldera wall and vents on the post-caldera dome.


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-- Edited by Blobrana at 03:08, 2007-07-27

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