Tofua Arc at 21.3°S Volcano — Tonga

During a submarine eruption in 1907 pyroclastic material was ejected to 100 m above the ocean surface, and pumice rafts were produced. The eruption was located (on Admiralty Chart 2421) ~48 km SW of Tongatapu Island. The location given in this catalog has been shifted 5 km N relative to the 1907 report, to a seamount that rises to within 100 m of the ocean surface, because the previous spot corresponds to sloping terrain at 1,800 m depth on a 1982 bathymetric map. A second eruption from this area was reported in late 1932. This seamount may be the SE part of a larger edifice extending about 15 km NW, informally designated as "Volcano 2" (R/V Sonne 167 survey).