Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Hachijojima
Conical Nishi-yama volcano, seen here from the older cone Higashi-yama, forms the NW part of elongated Hachijo-jima island. The island's airport and its largest town occupy the flanks of Nishi-yama. The small volcanic island of Ko-jima (upper left) lies several km to the west of Hachijo-jima. The latest major activity of Nishi-yama, from the early Holocene until about 4000 years ago, was restricted to flank eruptions. Photo by Ichio Moriya (Kanazawa University).
Volcano Number:284050
Volcano Name:Hachijojima
Country:Japan
Volcano Type:Stratovolcano(es)
Last Eruption:1606
Elevation:854m
Tectonic Setting:Subduction zone / Oceanic crust (< 15 km)
Pop. within 5km:11275
Pop. within 10km:13560
Pop. within 30km:13564
Pop. within 100km:14082
Latitude:33.137
Longitude:139.766



Eruption Data from the Global Volcanism Program of the Smithsonian Institution
Volcano Number Volcano Name Eruption Number Activity Type Explosivity Index Max Explosivity Index Modifier Activity Area Activity Unit Start Evidence Method Start Date End Date
284050 Hachijojima 18283 Confirmed Eruption 4 Nishi-yama Tephrochronology -8020
284050 Hachijojima 18284 Confirmed Eruption Nishi-yama Tephrochronology -7650
284050 Hachijojima 18285 Confirmed Eruption 3 Higashi-yama south flank Tephrochronology -5020
284050 Hachijojima 18286 Confirmed Eruption 5 Nishi-yama Tephrochronology -4650
284050 Hachijojima 18287 Confirmed Eruption Nishi-yama Tephrochronology -3350
284050 Hachijojima 18288 Confirmed Eruption 3 Between Nishi-yama & Higashi-yama Radiocarbon (corrected) -2700
284050 Hachijojima 18289 Confirmed Eruption 3 S flank of Higashi-yama (Myohoji) Tephrochronology -2550
284050 Hachijojima 18290 Confirmed Eruption 4 Nishi-yama Tephrochronology -2450
284050 Hachijojima 18291 Confirmed Eruption 5 SE of Nishi-yama, NE of Higashi-yama Tephrochronology -2050
284050 Hachijojima 18292 Confirmed Eruption Nishi-yama Tephrochronology -1250
284050 Hachijojima 18293 Confirmed Eruption SE flank of Nishi-yama (Kanda-yama) Tephrochronology -1150
284050 Hachijojima 18294 Confirmed Eruption 3 NW flank of Higashi-yama Tephrochronology -350
284050 Hachijojima 18295 Confirmed Eruption Nishi-yama Radiocarbon (corrected) -150
284050 Hachijojima 18296 Confirmed Eruption Nishi-yama summit and SE flank Radiocarbon (corrected) 850
284050 Hachijojima 18297 Confirmed Eruption 2 Nishi-yama Historical Observations 1487/12/7
284050 Hachijojima 18298 Confirmed Eruption 2 Nishi-yama Historical Observations 1518 1523
284050 Hachijojima 18299 Confirmed Eruption 2 Nishi-yama SE flank Historical Observations 1605/10/27
284050 Hachijojima 18300 Confirmed Eruption 2 Submarine flank Historical Observations 1606/1/23
284050 Hachijojima 18301 Uncertain Eruption 2 1707
Emissions Data from the Global Volcanism Program of the Smithsonian Institution No emissions data found for this volcano.


Data from the Earthchem Portal


Data from the SESAR Database


Data from the MaGa Database
Location: Sueyoshi Hot Spring Well (View Details at MaGa DB)
Description: unknown
Hazard Description: unknown
Type: well
Region: Tokyo, Japan
Country: Japan
Volcanic Complex: Hachijojima
Gas Concentration Data:
Measurement Name Detail Specie Concentration Unit of Measure
Sue-1 Detail CO2 787.87 micromol/mol
Sue-1 Detail S (total) 144.55 micromol/mol
Sue-1 Detail H2S 144.55 micromol/mol
Sue-1 Detail NH3 0.83 micromol/mol
Sue-1 Detail Ar 0.713 micromol/mol
Sue-1 Detail N2 65.985 micromol/mol
Sue-1 Detail He 0 micromol/mol
Sue-1 Detail H2 0.014 micromol/mol
Sue-1 Detail O2 0 micromol/mol
Sue-1 Detail CH4 0.012 micromol/mol
Sue-1 Detail CO 0 micromol/mol
Gas Isotope Data:
Measurement Name Detail Isotope Abundance Unit of Measure
Sue-1 Detail d15N -0.1 permill_vs_smow
Gas Temperature Data:
Measurement Name Detail Temperature Unit of Measure
Sue-1 Detail 43.9 °C

Location: Kashidate Hot Spring Well (View Details at MaGa DB)
Description: unknown
Hazard Description: unknown
Type: well
Region: Tokyo, Japan
Country: Japan
Volcanic Complex: Hachijojima
Gas Concentration Data:
Measurement Name Detail Specie Concentration Unit of Measure
Kas-1 Detail CO2 926.15 micromol/mol
Kas-1 Detail S (total) 61.06 micromol/mol
Kas-1 Detail H2S 61.06 micromol/mol
Kas-1 Detail NH3 0.081 micromol/mol
Kas-1 Detail Ar 0.29 micromol/mol
Kas-1 Detail N2 12.243 micromol/mol
Kas-1 Detail He 0 micromol/mol
Kas-1 Detail H2 0.004 micromol/mol
Kas-1 Detail O2 0.168 micromol/mol
Kas-1 Detail CH4 0.007 micromol/mol
Kas-1 Detail CO 0 micromol/mol
Gas Isotope Data:
Measurement Name Detail Isotope Abundance Unit of Measure
Kas-1 Detail d15N 0.1 permill_vs_smow
Gas Temperature Data:
Measurement Name Detail Temperature Unit of Measure
Kas-1 Detail 44.6 °C

Location: Ogoshi Hot Spring Well (View Details at MaGa DB)
Description: unknown
Hazard Description: unknown
Type: well
Region: Tokyo, Japan
Country: Japan
Volcanic Complex: Hachijojima
Gas Concentration Data:
Measurement Name Detail Specie Concentration Unit of Measure
Ogo-1 Detail CO2 918.3 micromol/mol
Ogo-1 Detail S (total) 47.5 micromol/mol
Ogo-1 Detail H2S 47.5 micromol/mol
Ogo-1 Detail HF 1.365 micromol/mol
Ogo-1 Detail NH3 0.576 micromol/mol
Ogo-1 Detail Ar 0.692 micromol/mol
Ogo-1 Detail N2 29.041 micromol/mol
Ogo-1 Detail He 0 micromol/mol
Ogo-1 Detail H2 0.044 micromol/mol
Ogo-1 Detail O2 2.407 micromol/mol
Ogo-1 Detail CH4 0.069 micromol/mol
Ogo-1 Detail CO 0 micromol/mol
Gas Isotope Data:
Measurement Name Detail Isotope Abundance Unit of Measure
Ogo-1 Detail d15N 1.9 permill_vs_smow
Gas Temperature Data:
Measurement Name Detail Temperature Unit of Measure
Ogo-1 Detail 53.3 °C

Location: Yasuragi Hot Spring Well (View Details at MaGa DB)
Description: unknown
Hazard Description: unknown
Type: well
Region: Tokyo, Japan
Country: Japan
Volcanic Complex: Hachijojima
Gas Concentration Data:
Measurement Name Detail Specie Concentration Unit of Measure
Yas-1 Detail CO2 854.43 micromol/mol
Yas-1 Detail S (total) 118.3 micromol/mol
Yas-1 Detail SO2 113.23 micromol/mol
Yas-1 Detail H2S 4.94 micromol/mol
Yas-1 Detail HF 4.418 micromol/mol
Yas-1 Detail NH3 0.783 micromol/mol
Yas-1 Detail Ar 0.51 micromol/mol
Yas-1 Detail N2 20.79 micromol/mol
Yas-1 Detail He 0.00729 micromol/mol
Yas-1 Detail H2 0.008 micromol/mol
Yas-1 Detail O2 0.709 micromol/mol
Yas-1 Detail CH4 0.04 micromol/mol
Yas-1 Detail CO 0 micromol/mol
Gas Isotope Data:
Measurement Name Detail Isotope Abundance Unit of Measure
Yas-1 Detail d15N 0.3 permill_vs_smow
Gas Temperature Data:
Measurement Name Detail Temperature Unit of Measure
Yas-1 Detail 54.4 °C

Location: Geothermal Power Plant, Hachijojima (View Details at MaGa DB)
Description: unknown
Hazard Description: unknown
Type: well
Region: Tokyo, Japan
Country: Japan
Volcanic Complex: Hachijojima
Gas Concentration Data:
Measurement Name Detail Specie Concentration Unit of Measure
Geo-1 Detail H2O 990.76 micromol/mol
Geo-1 Detail CO2 864.94 micromol/mol
Geo-1 Detail S (total) 121.56 micromol/mol
Geo-1 Detail SO2 42.69 micromol/mol
Geo-1 Detail H2S 78.51 micromol/mol
Geo-1 Detail HCl 1.363 micromol/mol
Geo-1 Detail HF 0.356 micromol/mol
Geo-1 Detail NH3 0.051 micromol/mol
Geo-1 Detail Ar 0.005 micromol/mol
Geo-1 Detail N2 1.311 micromol/mol
Geo-1 Detail He 0.00108 micromol/mol
Geo-1 Detail H2 10.389 micromol/mol
Geo-1 Detail O2 0 micromol/mol
Geo-1 Detail CH4 0.022 micromol/mol
Geo-1 Detail CO 0 micromol/mol
Geo-2 Detail H2O 990.68 micromol/mol
Geo-2 Detail CO2 820.18 micromol/mol
Geo-2 Detail S (total) 107.56 micromol/mol
Geo-2 Detail SO2 63.46 micromol/mol
Geo-2 Detail H2S 43.86 micromol/mol
Geo-2 Detail HCl 2.292 micromol/mol
Geo-2 Detail HF 0.254 micromol/mol
Geo-2 Detail NH3 1.438 micromol/mol
Geo-2 Detail Ar 0.263 micromol/mol
Geo-2 Detail N2 46.598 micromol/mol
Geo-2 Detail He 0 micromol/mol
Geo-2 Detail H2 21.318 micromol/mol
Geo-2 Detail O2 0.048 micromol/mol
Geo-2 Detail CH4 0.043 micromol/mol
Geo-2 Detail CO 0.00354 micromol/mol
Gas Isotope Data:
Measurement Name Detail Isotope Abundance Unit of Measure
Geo-1 Detail d15N 4.8 permill_vs_smow
Geo-2 Detail d15N 3 permill_vs_smow
Gas Temperature Data:
Measurement Name Detail Temperature Unit of Measure
Geo-1 Detail 170.8 °C
Geo-2 Detail 170.8 °C