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James Healy Seamount

Healy

Stratovolcano · New Zealand · 980m (submarine)

A bathymetric map of Healy submarine volcano is overlain by dive tracks of the submersible vehicle Pisces V. Dive depths range from 1,120 to 1,490 m. The resolution of the bathymetry data is 25 m, and the contour interval is 20 m. Roughly 600-year-old pumice deposits found on the shores of North Island, New Zealand, originated from Healy. The bathymetry data were obtained during a 2005 New Zealand-American NOAA Ocean Explorer research expedition to the Kermadec Arc.
A bathymetric map of Healy submarine volcano is overlain by dive tracks of the submersible vehicle Pisces V. Dive depths range from 1,120 to 1,490 m. The resolution of the bathymetry data is 25 m, and the contour interval is 20 m. Roughly 600-year-old pumice deposits found on the shores of North Island, New Zealand, originated from Healy. The bathymetry data were obtained during a 2005 New Zealand-American NOAA Ocean Explorer research expedition to the Kermadec Arc. · Photo: Image courtesy of New Zealand-American Submarine Ring of Fire 2005 Exploration, NOAA Vents Program. · Wikimedia Commons
Type
Stratovolcano
Country
New Zealand
Region
Tonga-Kermadec Volcanic Regions / Southern Kermadec Volcanic Arc
Elevation
980m (submarine)
Coordinates
-35.004, 178.973
Last eruption
1360
Tectonic setting
Subduction zone / Oceanic crust (< 15 km)
Landform
Composite
Major rock type
Dacite
Geological summary

Healy submarine volcano lies along the South Kermadec Ridge and consists of an elongated edifice with a 3 x 4 km wide caldera at the NE end whose rim reaches to 1,150 m below sea level. A smaller caldera lies to the SW, and a cone, Cotton volcano, rises to 980 below sea level at the SW end of the 15-km-long complex. The flat-lying floor of the larger NE caldera lies 250-400 m below the caldera rim. Rhyodacitic pumice deposits mantle the caldera floor and walls, as well as the flanks. Active hydrothermal venting has been observed on the lower part of the southern caldera wall. The roughly 590-year-old sea-rafted Loisels Pumice deposit found in many Holocene beach sequences of North Island, New Zealand, and as far away as the Chatham Islands, 650 km east of New Zealand, is chemically and texturally similar to pumices from Healy caldera.

From Wikipedia

James Healy Seamount 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-kilometre-wide (1.2–1.6 mi) and 1.3-kilometre-wide (0.81 mi) 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.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1360~1360 · 1 eruptions · max VEI ?13601360136113611361

Detailed timeline

  1. 1360 (±75 yrs)VEI ?Geological estimate
    1360 – Ongoing
    Healy caldera

External links

⚠ For reference only. Not for emergency response.