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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 36.762°N
  • 139.494°E

  • 2486 m
    8154 ft

  • 283141
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Nantai.

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

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

Basic Data

Volcano Number

Last Known Eruption



9540 BCE

2486 m / 8154 ft


Volcano Types


Rock Types

Andesite / Basaltic Andesite
Basalt / Picro-Basalt

Tectonic Setting

Subduction zone
Continental crust (> 25 km)


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

Geological Summary

Nantai stratovolcano rises above the north shore of Lake Chuzenji in Nikko National Park, and forms a backdrop to the renowned temple complex at Nikko. Lava flows from the early stage of the construction of Nantai volcano dammed up the Daiyo River, forming Lake Chuzenji. The dramatic Kegon waterfall plunges over this barrier. Nantai has an asymmetrical profile when viewed from the west as a result of late-stage collapse of the north side of the volcano. Two major late-stage eruptions ejected large amounts of scoriae, followed by the emission of pyroclastic flows. The latest effusive activity of Nantai produced the Osawa lava flow, a thick, viscous dacitic flow that traveled from the breached crater down the north flank. The Bentengawara pyroclastic-flow deposit representing the latest known eruptive activity was radiocarbon dated at about 10,000 years Before Present and was emplacement following a quiescent period of about 3000 years.


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..

Ishikawa T, Minato M, Kuno H, Matsumoto T, Yagi K, 1957. Welded tuffs and deposits of pumice flow and nuee ardente in Japan. 20th Internatl Geol Cong, Mexico City, Sec 1: 137-150.

Miyake Y, Saito M, Takeshita Y, Oikawa T, Saito T, 2009. A newly found pyroclastic flow deposit around 10 ka at Nikko Nantai volcano, northeast Japan. Bull Volc Soc Japan (Kazan), 54: 163-173 (in Japanese with English abs).

Nakano S, Yamamoto T, Iwaya T, Itoh J, Takada A, 2001-. Quaternary Volcanoes of Japan. Geol Surv Japan, AIST,

Suzuki T, 1996. Discharge rates of fallout tephra and frequency of plinian eruptions during the last 400,000 years in the southern Northeast Japan arc. Quat Internatl, 34-36: 79-87.

Tsuboi S, Sugi K, 1926. Geological guide to the Nikko district. Pan-Pacific Sci Cong Guidebook Excur, B-1: 4-25.

Yamasaki M, 1981. Nantai and adjacent volcanoes in the Nikko region. In: Aramaki S (ed) {Symp Arc Volcano Field Excur Guide to Fuji, Asama, Kusatsu-Shirane and Nantai Volcanoes}, Tokyo: Volc Soc Japan, 1: 64-75,.

Eruptive History

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
9540 BCE ± 500 years Unknown Confirmed   Radiocarbon (corrected) Bentengawara pyroclastic-flow deposit

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.


Feature Name Feature Type Elevation Latitude Longitude
Tansei Dome

Photo Gallery

Nantai stratovolcano on the right horizon rises above Yunoko lake and the Senjogahara plain (right center). Lava flows from the early stage of the construction of Nantai volcano dammed up the Daiyo River, forming Lake Chuzenji, out of view to the right. The dramatic Kegon waterfall plunges over this barrier. A collapse depression on the north (left) side of the volcano gives Nantai a somewhat asymmetrical profile. The latest effusive activity of Nantai produced the Osawa lava flow, which traveled from the breached crater down the north flank.

Photo by Yukio Hayakawa (Gunma University).

Smithsonian Sample Collections Database

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

Affiliated Sites

Large Eruptions of Nantai 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.