Kasuga 1

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 21.765°N
  • 143.71°E

  • -598 m
    -1961 ft

  • 284134
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: November 1985 (SEAN 10:11) Citation IconCite this Report


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 Contacts: JMA, Tokyo.

The Global Volcanism Program has no Weekly Reports available for Kasuga 1.

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.

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

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




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


January 1977 (NSEB 02:01) Citation IconCite this Report


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.


November 1985 (SEAN 10:11) Citation IconCite this Report


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 Contacts: JMA, Tokyo.

Eruptive History


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.

Photo Gallery


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).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Kasuga 1 in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites