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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 21.765°N
  • 143.71°E

  • -598 m
    -1961 ft

  • 284134
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Kasuga.

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

Index of Monthly Reports

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.

01/1977 (SEAN 02:01) Possible submarine eruption in November 1975

11/1985 (SEAN 10:11) No water discoloration observed, December 1983-December 1985

Contents of Monthly Reports

All information contained in these reports is preliminary and subject to change.

01/1977 (SEAN 02:01) Possible submarine eruption in November 1975

[A table of possible submarine eruptions based on aerial observations of water discoloration by the Japanese Maritime Safety Agency included an entry for 21.78°N, 143.71°E, in November 1975. This location is very close to Kasuga.]

Information Contacts: AFP; U.S. Defense Mapping Agency.

11/1985 (SEAN 10:11) No water discoloration observed, December 1983-December 1985

JMSA has continued frequent aerial monitoring of several known submarine volcanoes. Volcanic activity has often been observed at Fukutoku-okanoba during overflights since late 1983, but no water discoloration has been seen at Kasuga, Nikko, or Fukujin.

Information Contact: JMA, Tokyo.

Kasuga seamount is a conical volcano that rises to within 598 m of the sea surface SE of Fukujin submarine volcano. Kasuga is listed as an active volcano by the Japan Meteorological Agency, and floating pumice attributed to a submarine eruption of Kasuga was seen south of the volcano in the summer of 1959. Water discoloration from a possible submarine eruption was reported from a location near Kasuga seamount in November 1975. Kasuga, the northernmost of three seamounts in the the Kasuga seamount chain, rises from a depth of 3000 m. A series of flank vents are located low on the southern side of the edifice. The summit of Kasuga does not have a caldera or display hydrothermal activity, and the volcano is largely mantled by volcaniclastics. Altered basaltic and andesitic rocks dredged from the summit suggest that Kasuga 1 is the oldest of the three seamounts, although delicately preserved lava flow lobes and toes from a flank eruption suggest a very youthful age.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1975 Nov ] [ Unknown ] Uncertain 0   21.78 N 143.71 E
1959 Jul 15 ± 45 days Unknown Confirmed 0 Historical Observations

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.

Kasuga-kaizan | Kasuga 1 | Kasugaba
Kasuga, the northernmost of three seamounts in the Kasuga seamount chain (and also known as Kasuga 1), is a conical volcano that rises to within 598 m of the sea surface SE of Fukujin submarine volcano. A series of flank vents are located low on the southern side of the edifice. Delicately preserved flank lava flow lobes suggest a very youthful age, as also seen from the volcano's youthful constructional surface in this NOAA image made without vertical exaggeration. Pumice from a submarine eruption was seen in 1959.

Image courtesy of NOAA, 2003 (http://oceanexplorer.noaa.gov/explorations/03fire/logs/mar02/media/kasuga.html).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Bloomer S H, Stern R J, Smoot N C, 1989. Physical volcanology of the submarine Mariana and Volcano arcs. Bull Volc, 51: 210-224.

Fryer P, Gill J B, Jackson M C, 1997. Volcanological and tectonic evolution of the Kasuga seamounts, northern Mariana Trough: Alvin submersible investigations. J Volc Geotherm Res, 79: 277-311.

Japan Meteorological Agency, 1996. National Catalogue of the Active Volcanoes in Japan (second edition). Tokyo: Japan Meteorological Agency, 502 p (in Japanese).

Japan Meteorological Agency, 1982. List of the Active Volcanoes in Japan. Volc Bull Japan Meteorological Agency, 20: 2.

Massoth G, Chadwick B, 2003. Submarine arc volcanoes. Nat Oceanic Atmosph Admin (NOAA, http://oceanexplorer.noaa.gov/explorations/03fire (accessed April 25, 2003).

Smithsonian Institution-SEAN, 1975-89. [Monthly event reports]. Bull Scientific Event Alert Network (SEAN), v 1-14.

Volcano Types


Tectonic Setting

Subduction zone
Crustal thickness unknown

Rock Types

Andesite / Basaltic Andesite


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

Affiliated Databases

Large Eruptions of Kasuga 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).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.