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Moutohora Island

Photo of this volcano
  • New Zealand
  • New Zealand to Fiji
  • Complex
  • Pleistocene
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 37.858°S
  • 176.98°E

  • 354 m
    1161 ft

  • 241815
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: March 1990 (BGVN 15:03) Citation IconCite this Report

CO2-rich gases from thermal area

The following observations, made by scientists from the USSR and New Zealand during a cruise of the RV Vulkanolog, were reported by W.F. Giggenbach and I. Menyailov.

"...Thermal activity manifests itself largely in areas of hydrothermally altered, steaming ground. The major thermal feature is a vigorously boiling pool near sea level in Sulphur Bay (Ramsay and Hayward, 1971). As indicated by the occurrence of bubble zones (Glasby, 1971), submarine thermal activity extends well SW of the island.

"During both the 1988 and 1990 cruises of the RV Vulkanolog, gas and water samples were collected from the main pool. The waters are essentially acid sulfate (4,000 mg/kg; Cl, 20 mg/kg), steam-heated, initially non-saline groundwater. Compositions of 1988 gases are compared in table 1 with those of 1974 samples from Sulphur Bay spring and the seafloor at 34 m depth (Lyon and others, 1977).

Table 1. Chemical composition of gases collected from vents on and near Whale Island (in mmol/mol of dry gas), March 1974 (Lyon and others, 1977) and during the September 1988 cruise of the RV Vulkanolog.

Vent Seafloor (34 m depth) Island (pool)
Date 10 Sep 1974 10 Sep 1974 10 Sep 1974 10 Mar 1988 10 Mar 1988
C 15 15 99 99 99
CO2 734 680 967 935 937
H2S -- -- -- 12.5 12.2
He -- -- -- 0.0028 0.0010
Ne -- -- -- 0.00004 0.00006
Ar 1.2 0.8 0.07 0.04 0.03
H2 0.1 0.3 3.2 11.2 9.7
O2 14.1 7.5 <0.01 <0.03 <0.03
N2 131 119 11 13 11
CH4 120 193 18 28 30

"All gases reflect a hydrothermal origin, and their major component is CO2. The seafloor gases are contaminated with air, probably after sampling. Their higher CH4 and lower H2 contents suggest longer residence at lower temperatures compared to the island samples. The composition of the latter has remained essentially unchanged over the last 14 years."

References. Glasby, G.P., 1971, Direct observation of columnar scattering associated with geothermal gas bubbling in the Bay of Plenty, New Zealand: New Zealand Journal of Marine and Freshwater Research, v. 5, p. 483-496.

Lyon, G.L., Giggenbach, W.F., Singleton, R.J., and Glasby, G.P., 1977, Isotopic and Chemical composition of submarine geothermal gases from the Bay of Plenty, New Zealand: New Zealand Department of Scientific and Industrial Research Bulletin, v. 218, p. 65-67.

Ramsay, W.R.H., and Hayward, B.W., 1971, Geology of Whale Island: Tane, v. 17, p. 9-32.

Information Contacts: I. Menyailov and A. Ivanenko, IV, Petropavlovsk; W. Giggenbach, DSIR Chemistry, Petone.

The Global Volcanism Program has no Weekly Reports available for Moutohora Island.

Bulletin Reports - Index

Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

03/1990 (BGVN 15:03) CO2-rich gases from thermal area




Information is preliminary and subject to change. All times are local (unless otherwise noted)


March 1990 (BGVN 15:03) Citation IconCite this Report

CO2-rich gases from thermal area

The following observations, made by scientists from the USSR and New Zealand during a cruise of the RV Vulkanolog, were reported by W.F. Giggenbach and I. Menyailov.

"...Thermal activity manifests itself largely in areas of hydrothermally altered, steaming ground. The major thermal feature is a vigorously boiling pool near sea level in Sulphur Bay (Ramsay and Hayward, 1971). As indicated by the occurrence of bubble zones (Glasby, 1971), submarine thermal activity extends well SW of the island.

"During both the 1988 and 1990 cruises of the RV Vulkanolog, gas and water samples were collected from the main pool. The waters are essentially acid sulfate (4,000 mg/kg; Cl, 20 mg/kg), steam-heated, initially non-saline groundwater. Compositions of 1988 gases are compared in table 1 with those of 1974 samples from Sulphur Bay spring and the seafloor at 34 m depth (Lyon and others, 1977).

Table 1. Chemical composition of gases collected from vents on and near Whale Island (in mmol/mol of dry gas), March 1974 (Lyon and others, 1977) and during the September 1988 cruise of the RV Vulkanolog.

Vent Seafloor (34 m depth) Island (pool)
Date 10 Sep 1974 10 Sep 1974 10 Sep 1974 10 Mar 1988 10 Mar 1988
C 15 15 99 99 99
CO2 734 680 967 935 937
H2S -- -- -- 12.5 12.2
He -- -- -- 0.0028 0.0010
Ne -- -- -- 0.00004 0.00006
Ar 1.2 0.8 0.07 0.04 0.03
H2 0.1 0.3 3.2 11.2 9.7
O2 14.1 7.5 <0.01 <0.03 <0.03
N2 131 119 11 13 11
CH4 120 193 18 28 30

"All gases reflect a hydrothermal origin, and their major component is CO2. The seafloor gases are contaminated with air, probably after sampling. Their higher CH4 and lower H2 contents suggest longer residence at lower temperatures compared to the island samples. The composition of the latter has remained essentially unchanged over the last 14 years."

References. Glasby, G.P., 1971, Direct observation of columnar scattering associated with geothermal gas bubbling in the Bay of Plenty, New Zealand: New Zealand Journal of Marine and Freshwater Research, v. 5, p. 483-496.

Lyon, G.L., Giggenbach, W.F., Singleton, R.J., and Glasby, G.P., 1977, Isotopic and Chemical composition of submarine geothermal gases from the Bay of Plenty, New Zealand: New Zealand Department of Scientific and Industrial Research Bulletin, v. 218, p. 65-67.

Ramsay, W.R.H., and Hayward, B.W., 1971, Geology of Whale Island: Tane, v. 17, p. 9-32.

Information Contacts: I. Menyailov and A. Ivanenko, IV, Petropavlovsk; W. Giggenbach, DSIR Chemistry, Petone.

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.

Eruptive History

The Global Volcanism Program is not aware of any Holocene eruptions from Moutohora Island. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Moutohora Island page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

Deformation History

There is no Deformation History data available for Moutohora Island.

Emission History

There is no Emissions History data available for Moutohora Island.

Photo Gallery

The Global Volcanism Program has no photographs available for Moutohora Island.

GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.

Title: Bay of Plenty-Southern Havre Trough Physiography
Publisher: Department of Scientific and Industrial Research
Country: New Zealand
Year: 1990
Series: Misc
Map Type: Bathymetric
Scale: 1:400,000
Map of Bay of Plenty-Southern Havre Trough Physiography
Title: Bay of Plenty
Publisher: Department of Scientific and Industrial Research
Country: New Zealand
Year: 1989
Series: Coastal
Map Type: Bathymetric
Scale: 1:200,000
Map of Bay of Plenty
Title: New Zealand Geol
Publisher: NZGS, DSIR (Dept Scientific & Industrial Research)
Country: New Zealand
Year: 1987
Map Type: Geology
Scale: 1:2,000,000
Map of New Zealand Geol
Title: Central N Island, Touring Map
Publisher: Department of Lands and Survey New Zealand
Country: New Zealand
Year: 1986
Series: NZMS
Map Type: Geographic
Scale: 1:250,000
Map of Central N Island, Touring Map
Title: New Zealand Topo Map
Publisher: Department of Lands and Survey New Zealand
Country: New Zealand
Year: 1983
Series: NZMS
Map Type: Topographic
Scale: 1:500,000
Map of New Zealand Topo Map
Title: Late Quaternary Tectonic Map of New Zealand
Publisher: Department of Scientific and Industrial Research
Country: New Zealand
Year: 1977
Series: Misc Map Series
Map Type: Geology (Tectonic)
Scale: 1:2,000,000
Map of Late Quaternary Tectonic Map of New Zealand
Title: N Island, Geol Map of NZ
Publisher: NZGS, DSIR (Dept Scientific & Industrial Research)
Country: New Zealand
Year: 1975
Map Type: Geology
Scale: 1:1,000,000
Map of N Island, Geol Map of NZ
Title: N Island, Quaternary Geol
Publisher: NZGS
Country: New Zealand
Year: 1973
Series: Misc
Map Type: Geology
Scale: 1:1,000,000
Map of N Island, Quaternary Geol
Title: Quaternary Geology-North Island
Publisher: Department of Scientific and Industrial Research
Country: New Zealand
Year: 1973
Series: Misc Map Series
Map Type: Geology
Scale: 1:1,000,000
Map of Quaternary Geology-North Island
Title: New Zealand
Publisher: US Central Intelligence Agency
Country: New Zealand
Year: 1971
Map Type: Geographic
Scale: 1:7,500
Map of New Zealand
Title: Rotorua
Publisher: Department of Scientific and Industrial Research
Country: New Zealand
Year: 1964
Series: NZMS 1
Map Type: Geology
Scale: 1:250,000
Map of Rotorua
Smithsonian Sample Collections Database

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

Affiliated Sites