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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 35.004°S
  • 178.973°E

  • -980 m
    -3214 ft

  • 241140
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Healy.

The Global Volcanism Program has no Weekly Reports available for Healy.

The Global Volcanism Program has no Bulletin Reports available for Healy.

Basic Data

Volcano Number

Last Known Eruption



1360 CE

-980 m / -3214 ft


Volcano Types


Rock Types

Basalt / Picro-Basalt

Tectonic Setting

Subduction zone
Oceanic crust (< 15 km)


Within 5 km
Within 10 km
Within 30 km
Within 100 km

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 1150 m below sea level. A smaller caldera lies to the SW, and a satellitic 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.


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

de Ronde, C E J, Baker E T, Massoth G J, Lupton J E, Wright I C, Feely R A, Greene R R, 2001. Intra-oceanic subduction-related hydrothermal venting, Kermadec volcanic arc, New Zealand. Earth Planet Sci Lett, 193: 359-369.

Massoth G J, de Ronde C E J, Lupton J E, Feely R A, Baker E T, Lebon G T, Maenner S M, 2003. Chemically rich and diverse submarine hydrothermal plumes of the southern Kermadec volcanic arc (New Zealand). Geol Soc London Spec Pub, 219: 119-139.

NIWA/NOAA Vents Program, 2005. New Zealand American submarine ring of fire 2005 Kermadec arc submarine volcanoes. New Zeal Nat Inst Water Atmosph Res/NOAA Vents Program final cruise report (http://www.oceanexplorer.noaa.gov/explorations/05fire/logs/leg2_summary/media/srof05_cruisereport_final.pdf).

Wright I C, Gamble J A, 1999. Southern Kermadec submarine caldera arc volcanoes (SW Pacific): caldera formation by effusive and pyroclastic eruption. Marine Geol, 161: 207-227.

Wright I C, Gamble J A, Shane P A R, 2003. Submarine silicic volcanism of the Healy caldera, southern Kermadec arc (SW Pacific): I - volcanology and eruption mechanisms . Bull Volc, 65: 15-29.

Wright I C, Worthington T J, Gamble J A, 2006. New multibeam mapping and geochemistry of the 30°-35° S sector, and overview, of southern Kermadec arc volcanism. J Volc Geotherm Res, 149: 263-296.

Eruptive History

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1360 ± 75 years Unknown Confirmed   Radiocarbon (corrected) Healy caldera

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Feature Name Feature Type Elevation Latitude Longitude
Cotton Cone -980 m 35° 3' 0" S 178° 58' 30" E

Photo Gallery

A bathymetric map of Healy submarine volcano is overlain by dive tracks of the submersible vehicle Pisces V. Depths in the area of the dives range from 1120 to 1490 meters. The resolution of the bathymetry data is 25 meters, and the contour interval is 20 meters. Roughly 600-year-old pumice deposits found on the shores of North Island, New Zealand, originated from Healy submarine volcano. The bathymetry data were obtained during a 2005 New Zealand/American NOAA Ocean Explorer research expedition to the Kermadec arc.

Image courtesy of New Zealand-American Submarine Ring of Fire 2005 Exploration, NOAA Vents Program.

Smithsonian Sample Collections Database

There are no samples for Healy in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites

Large Eruptions of Healy Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.