Brothers Volcano | John Seach

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New Zealand

35.875 S, 179.075 E
summit elevation -1350 m
Submarine volcano

Brothers volcano is located 337 km NE of White Island, New Zealand. The submarine volcano shows hydrothermal activity.

The volcano is nearly circular in shape, 7–9 km in diameter, and rises over 900
m to a minimum water depth of 1350 m at the caldera rim. Effusive lava flows occur on the northwestern flank forming radial patterns originating from near the caldera rim.

Summit Caldera
The summit caldera partially encircles a 1.52 km wide, 350 m high, central cone that partly coalesces with the inner, southeastern caldera wall. The caldera is 33.5 km in diameter. The caldera wall rises 350450 m above the 18801890 m deep
caldera floor. The caldera walls have average slopes of 5060 degrees, and show evidence of degradation, collapse and mass-wasting.

Further Reading
de Ronde, C.E. et al. 2005. Evolution of a submarine magmatic-hydrothermal system: Brothers volcano, southern Kermadec arc, New Zealand. Economic Geology, 100(6), pp.1097-1133.

Brothers Volcano Eruptions

Hydrothermal activity.