A 3-D image of Brothers Volcano as viewed looking to the NW. The cone at Brothers is prominent in the southern part of the caldera (crater) and rises about 350 meters (1,150 feet) above the caldera floor to a depth of about 1,100 m (3,600 ft) below sea surface. An extensive hydrothermal field occurs atop this cone and also on the summit of the smaller cone on its flanks. A bigger hydrothermal vent field again is perched on the NW caldera walls. 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).
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