James Healy Seamount
James Healy Seamount (former names Healy Seamount, Healy Volcano) 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.
| James Healy Seamount | |
|---|---|
Geology and map of the Tonga-Kermadec arc | |
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 |
| Geology | |
| Last eruption | 1360 |
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.