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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 32.1°N
  • 139.85°E

  • -360 m
    -1181 ft

  • 284061
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Kita-Bayonnaise.

The Global Volcanism Program has no Weekly Reports available for Kita-Bayonnaise.

The Global Volcanism Program has no Bulletin Reports available for Kita-Bayonnaise.

Basic Data

Volcano Number

Last Known Eruption



Unknown - Evidence Uncertain

-360 m / -1181 ft


Volcano Types

Lava dome

Rock Types

Andesite / Basaltic Andesite

Tectonic Setting

Subduction zone
Oceanic crust (< 15 km)


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

Geological Summary

The large submarine Kita-Bayonnaise (North Bayonnaise) submarine caldera, also known as Myojin Knoll, lies between the Aogashima and Myojinsho (also called Beyonesu Rocks) calderas in the Izu-Bonin arc. The 6-7 km wide caldera, one of nine along this arc, has walls 500-900 m high. The high point on the western rim is a pumice-mantled remnant of the pre-collapse volcanic complex that reaches a depth of 360 m. The caldera walls reveal rhyolitic lava flows, shallow intrusions, and volcaniclastic deposits. A voluminous blanket of coarse rhyolitic pumice from the caldera-forming eruption mantles the rim and outer flanks. Post-caldera eruptions formed a lava dome that rises 250 m above the caldera floor. The age of the caldera is not known, but was considered by Fiske et al. (2001) to perhaps be as young as a few thousand years. An active hydrothermal vent field lies on the eastern caldera floor and has produced a polymetallic sulfide deposit from vent chimneys up to 30 m high that emit fluids as hot as 278 degrees C.


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

Fiske R S, Naka J, Iizasa K, Yuasa M, 1995. Caldera-forming submarine pyroclastic eruption at Myojin Knoll, Izu-Bonin Arc. JAMSTEC J Deep Sea Res, 11: 315-322.

Fiske R S, Naka J, Iizasa K, Yuasa M, Klaus A, 2001. Submarine silicic caldera at the front of the Izu-Bonin arc, Japan: voluminous seafloor eruptions of rhyolite pumice. Geol Soc Amer Bull, 113: 813-824.

Yuasa M, Nohara M, 1992. Petrographic and geochemical along-arc variations of volcanic rocks on the volcanic front of the Izu-Ogasawara (Bonin) Arc. Bull Geol Surv Japan, 43: 421-456.

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

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.


Kita-Beyonesu | Myojin Knoll


Feature Name Feature Type Elevation Latitude Longitude
Sunrise Thermal -1350 m 32° 6' 0" N 129° 52' 0" E

Photo Gallery

The submarine topography of the 6-7 km wide Myojin Knoll caldera is seen in this Sea-Beam image viewed from the SW. The white line marks the E-W track of the survey vessel. A voluminous blanket of coarse rhyolitic pumice from the caldera-forming eruption mantles the caldera rim and its outer flanks. A post-caldera lava dome rises 250 m above the caldera floor. An active hydrothermal vent field lies on the eastern caldera floor and has produced a polymetallic sulfide deposit extraordinarily rich in gold and silver.

Image by Fumitoshi Murakami (Geological Survey of Japan, courtesy of Richard Fiske, Smithsonian Institution).

Smithsonian Sample Collections Database

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

Affiliated Sites

Large Eruptions of Kita-Bayonnaise 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.