James Healy Seamount

James Healy Seamount
Geology and map of the Tonga-Kermadec arc
Location of James Healy Seamount In the Kermadec Islands chain
Summit depth	-950 m (-3120 ft)
Location
Location	In the Kermadec Islands chain
Coordinates	35°00.221′S 178°58.357′E / 35.003683°S 178.972617°E / -35.003683; 178.972617[1]
Geology
Last eruption	1360

James Healy Seamount (former names Healy Seamount, Healy Volcano)^[2] is a submarine volcano located among the South Kermadec Ridge Seamounts south of New Zealand's Kermadec Islands. It consists of a volcanic cone that reaches a depth of 1,150 metres (3,770 ft) below sea level, two 2–2.5 kilometres (1.2–1.6 mi) and 1.3 kilometres (0.81 mi) wide calderas and a parasitic cone that reaches a depth of 950 metres (3,120 ft) below sea level. The flanks of the volcano are covered with pumice and volcanic rocks, and hydrothermal venting occurs inside the caldera.

The caldera appears to have formed in one large explosive eruption that may have generated a pumice raft. Parts of the "Loisels Pumice" in New Zealand are suspected to have originated in this eruption, which took place 590±80 years before present (1950). Healy is also suspected to be the source of a tsunami that impacted Maori communities during the 15th century, and may be a continuing tsunami hazard.