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. It is three times bigger than the White Island. A dacite (dacite lava's viscosity is in between rhyolite and andesite) 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. These hydrothermal vents are also known as hot springs and have created an 8 meter high field of "black smoker" chimneys. These chimneys are created when the hydrothermal fluids hit the cold water and the chemicals in solution are deposited. The hydrothermal fluids are an energy source to many unique species of organisms like tubeworms and bacteria. The marine life and minerals found from these chimneys are beneficial to New Zealand's economy and biotechnology industry.
It is still unknown when the Brothers Volcano last erupted, but the crater walls tell us that its last eruption was so explosive that it caused the volcano to blow out a caldera. A joint expedition by the United States, New Zealand and Germany mapped the volcano in detail in 2007.
Submarine volcanoes are not monitored by any organization, but have become a central interest in current expeditions.
|Wikimedia Commons has media related to Brothers volcano.|
- "Volcano Fact Sheet: Brothers Volcano" (PDF). Learning on the Loop. Retrieved 27 October 2016.
- "Brothers Volcano". GNS Science. 19 December 2009. Archived from the original on 28 February 2011. Retrieved 21 March 2010.
- "Brothers Volcano". GNS Science. 25 November 2013. Archived from the original on 28 February 2011. Retrieved 27 October 2016.
- Gregory, Angela (17 August 2007). "Photo: Seabed volcano in all its glory". The New Zealand Herald. Retrieved 21 March 2010.
- de Ronde, C. E. J., et al. (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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