Esan

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 41.805°N
  • 141.166°E

  • 618 m
    2027 ft

  • 285011
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: September 2012 (BGVN 37:09) Citation IconCite this Report


Minor steam plumes in March 2012

E-san is located in S Hokkaido, the northernmost of Japan’s 47 prefectures (figure 1). Recent monthly reports of volcanic activity from the Japan Meteorological Agency (JMA), translated into English, resumed in October 2010. The only recent JMA report on E-san was in March 2012. This is the first BGVN report discussing E-san.

Figure (see Caption) Figure 1. A map showing a few of the major volcanoes of Japan, with their respective Alert Levels in March 2012. E-san is in the northernmost prefecture of Japan, Hokkaido. Courtesy of JMA.

According to JMA, in March 2012 steam plumes rose to heights of

A small-amplitude and short-duration volcanic tremor occurred on 30 March. After that, the number of small volcanic earthquakes increased until early on 31 March. No steam plumes could be observed on 31 March due to cloud cover; however, JMA reported no change in air vibrations or crustal deformation data. Field surveys on 2 April found no change in either the steam plumes from the crater or crustal deformation (GPS).

Information Contacts: Japan Meteorological Agency (JMA), Otemachi, 1-3-4, Chiyoda-ku Tokyo 100-8122, Japan (URL: http://www.jma.go.jp/jma/indexe.html).

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

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.

09/2012 (BGVN 37:09) Minor steam plumes in March 2012




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


September 2012 (BGVN 37:09) Citation IconCite this Report


Minor steam plumes in March 2012

E-san is located in S Hokkaido, the northernmost of Japan’s 47 prefectures (figure 1). Recent monthly reports of volcanic activity from the Japan Meteorological Agency (JMA), translated into English, resumed in October 2010. The only recent JMA report on E-san was in March 2012. This is the first BGVN report discussing E-san.

Figure (see Caption) Figure 1. A map showing a few of the major volcanoes of Japan, with their respective Alert Levels in March 2012. E-san is in the northernmost prefecture of Japan, Hokkaido. Courtesy of JMA.

According to JMA, in March 2012 steam plumes rose to heights of

A small-amplitude and short-duration volcanic tremor occurred on 30 March. After that, the number of small volcanic earthquakes increased until early on 31 March. No steam plumes could be observed on 31 March due to cloud cover; however, JMA reported no change in air vibrations or crustal deformation data. Field surveys on 2 April found no change in either the steam plumes from the crater or crustal deformation (GPS).

Information Contacts: Japan Meteorological Agency (JMA), Otemachi, 1-3-4, Chiyoda-ku Tokyo 100-8122, Japan (URL: http://www.jma.go.jp/jma/indexe.html).

Eruptive History


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


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1874 Jun 8 Unknown Confirmed 1 Historical Observations Es-6 tephra
1846 Nov 18 Unknown Confirmed 1 Historical Observations Es-5 tephra
1350 (?) Unknown Confirmed   Tephrochronology NW E-san, Es-4 tephra
0440 BCE ± 46 years Unknown Confirmed   Radiocarbon (corrected) Es-3 tephra
1050 BCE (?) Unknown Confirmed   Tephrochronology NW E-san, Es-2 tephra
3900 BCE ± 100 years Unknown Confirmed   Radiocarbon (corrected) NW E-san, Es-1 tephra
5770 BCE ± 924 years Unknown Confirmed 0 Radiocarbon (corrected) East flank (Misaka lava dome)
6670 BCE ± 27 years Unknown Confirmed 3 Radiocarbon (corrected) Esan lava dome, EsMP tephra

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


A 618-m-high lava dome tops E-san, a small stratovolcano at the eastern tip of the Oshima Peninsula. E-san is Hokkaido's southernmost active volcano. A minor phreatic eruption in 1846 produced a mudflow that caused many fatalities. The latest volcanic activity at E-san was a small eruption in 1874. Active fumaroles occur at a thermal area on the upper NW flank.

Photo by Ken-ichi Arai, 1996 (Hokkaido University).
See title for photo information.

Smithsonian Sample Collections Database


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

Affiliated Sites