Brothers Volcano as looking into the caldera from the south. The smooth cone (left foreground) is the site of recent volcanic eruptions and has ongoing hydrothermal venting from its summit crater. The smaller cone (to the right) is probably older, but it still has an intense hydrothermal system at its summit. The rougher, eroded topography of the caldera wall are older pre-caldera lavas and other volcanic rocks that have undergone submarine slope failure, at least partly due to undermining by hydrothermal “weathering.” Image courtesy of New Zealand American Submarine Ring of Fire 2007 Exploration, NOAA Vents Program, the Institute of Geological & Nuclear Sciences and NOAA-OE.
Related Links
New Zealand American Submarine Ring of Fire 2007
New Zealand American Submarine Ring of Fire 2007: Mission Summary
