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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 37.5°N
  • 130.87°E

  • 984 m
    3228 ft

  • 306030
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Ulreung.

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

The Global Volcanism Program has no Bulletin Reports available for Ulreung.

Basic Data

Volcano Number

Last Known Eruption



2990 BCE

984 m / 3228 ft


Volcano Types

Pyroclastic cone

Rock Types

Trachyandesite / Basaltic trachy-andesite

Tectonic Setting

Continental crust (> 25 km)


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

Geological Summary

Ulreung volcano, also known as Ullung, forms a small 10-km-wide island about 100 km east of the coast of the central Korean Peninsula. The high point on Ulreung-do (Ulreung Island) is 984-m-high Seonginbong Peak. The trachyandesitic Ulreung stratovolcano is truncated by the Nari caldera. Ulreung was the site of a major phonolitic explosive eruption at the beginning of the Holocene from Nari caldera that produced pyroclastic flows and deposited ash across the Sea of Japan (East Sea) in central Honshu.


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

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Lim C, Ikehara K, Toyoda K, 2008. Cryptotephra detection using high-resolution trace-element analysis of Holocene marine sediments, southwest Japan. Geochim Cosmochim Acta, 72: 5022-5036.

Machida H, 1990. Frequency and magnitude of catastrophic explosive volcanism in the Japan region during the past 130 ka: implications for human occupance of volcanic regions. Geol Soc Aust Symp Proc, 1: 27-36.

Machida H, Arai F, 1983. Extensive ash falls in and around the Sea of Japan from large, late Quaternary eruptions. J Volc Geotherm Res, 18: 151-164.

Tomita T, 1969. Volcanic geology of the Cenozoic alkaline petrographic province of eastern Asia. In: Ogura T (ed) {Geology and Mineral Resources of the Far East}, Tokyo: Univ Tokyo Press, p 139-179.

Eruptive History

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2990 BCE ± 40 years Unknown Confirmed   Radiocarbon (uncorrected) U-2 tephra
6450 BCE (?) Unknown Confirmed   Radiocarbon (corrected) U-3 tephra
8750 BCE (?) Unknown Confirmed 6 Radiocarbon (corrected) Ulreungdo-Oki tephra layer; U-4

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.


Ulreung-do | Utsuryo-to | Ullung-do | Seonginbong | Dagelet | Ulreuno-do


Feature Name Feature Type Elevation Latitude Longitude
Arpong Cone


Feature Name Feature Type Elevation Latitude Longitude
Nari Caldera

Photo Gallery

Ulreung volcano, also known as Ullung, forms a small 10-km-wide island in the Sea of Japan about 100 km east of the coast of the central Korean Peninsula. The island, seen in this NASA Landsat image (with north to the top) is a tourist destination from the Korean mainland. The 984-m-high stratovolcano is truncated by a caldera. Ulreung was the site of a major explosive eruption at the beginning of the Holocene that produced pyroclastic flows and deposited ash across the Sea of Japan in central Honshu.

NASA Landsat7 image (worldwind.arc.nasa.gov)

Smithsonian Sample Collections Database

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

Affiliated Sites

Large Eruptions of Ulreung 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.