The Brothers volcano is a Pacific Ocean submarine volcano in the Kermadec Arc, 340 kilometres north east of New Zealand's Whakaari/White Island. Within its oval outline, which measures 13 km by 8 km, it contains a 3 km wide caldera with walls 300-500 m high. A dacite dome rises 350 m from the caldera floor (which lies 1850 m below sea level), with a smaller dome just to its northeast. The caldera walls and the larger dome host numerous hydrothermal vents, which send plumes of hot water 750 m up through the water column. It is the most hydrothermally active volcano known in the Kermadec Arc.
A joint expedition by the United States, New Zealand and Germany mapped the volcano in detail in 2007.
- de Ronde, C. E. J., Hannington, M. D., Stoffers, P., Wright, I. C., Ditchburn, R. G., Reyes, A. G., Baker, E. T., Massoth, G. J., Lupton, J. E., Walker, S. L., Greene, R. R., Soong, C. W. R., Ishibashi, J., Lebon, G. T., Bray, C. J., and Resing, J. A. (2005). Evolution of a Submarine Magmatic-Hydrothermal System: Brothers Volcano, Southern Kermadec Arc, New Zealand, Economic Geology, 100(6), 1097-1133. doi:10.2113/100.6.1097.
- "Brothers". Global Volcanism Program. Smithsonian Institution.
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