Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Toya
Usu volcano is a small stratovolcano located astride the southern topographic rim of the 110,000-year-old Toya caldera. The summit of the volcano, seen here above the town of Toyako-Onsen to its NW, consists of dacitic lava domes and a cryptodome that were emplaced in a small summit caldera during historical eruptions, most recently during 1977-82. Similar historical eruptions have occurred on the flanks. Copyrighted photo by Dick Stoiber, 1981 (Dartmouth College).
Volcano Number:285030
Volcano Name:Toya
Country:Japan
Volcano Type:Stratovolcano
Last Eruption:2001 CE
Elevation:733m
Tectonic Setting:Subduction zone / Continental crust (> 25 km)
Pop. within 5km:5723
Pop. within 10km:36191
Pop. within 30km:214565
Pop. within 100km:3206914
Latitude:42.544
Longitude:140.839



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
285030 Toya 18589 Confirmed Eruption Usu Radiocarbon (corrected) -6550
285030 Toya 18591 Uncertain Eruption 1611
285030 Toya 18592 Confirmed Eruption Usu Historical Observations 1626/5/19 1626
285030 Toya 18593 Confirmed Eruption Usu Historical Observations 1638/7/25
285030 Toya 18594 Confirmed Eruption 5 Usu Usu-b Pumice Historical Observations 1663/8/16 1663/9/5
285030 Toya 18595 Confirmed Eruption Usu Tephrochronology 1690
285030 Toya 18596 Confirmed Eruption 4 Ko-Usu Historical Observations 1769/1/23
285030 Toya 18597 Confirmed Eruption 4 Foot of Ko-Usu dome, Ogari-yama Historical Observations 1822/3/12 1822
285030 Toya 18598 Confirmed Eruption 4 O-Usu Historical Observations 1853/4/22 1853
285030 Toya 18599 Confirmed Eruption 2 Usu North flank (Meiji-Shinzan) Historical Observations 1910/7/25 1910
285030 Toya 18600 Confirmed Eruption 2 Usu East flank (Showa-Shinzan) Historical Observations 1944/6/23 1945/9/19
285030 Toya 18601 Confirmed Eruption 3 Usu-Shinzan Historical Observations 1977/8/7 1982/3/16
285030 Toya 18602 Confirmed Eruption 2 Usu N flank (Kompira-yama & W Nishi-yama) Historical Observations 2000/3/31 2001/9/15
285030 Toya 20968 Confirmed Eruption Usu Radiocarbon (corrected) -4600
Emissions Data from the Global Volcanism Program of the Smithsonian Institution
Sorry. No emissions data found for this volcano.


Data from the Earthchem Library
Sorry. No data exist for this volcano in the EarthChem Library.
Data from the Earthchem Portal


Data from the SESAR Database


Data from the MaGa Database
Location: Showa-Shinzan (View Details at MaGa DB)
Description: Showa-Shinzan is a volcanic lava dome in the Shikotsu-Toya National Park, Hokkaidō, Japan, next to Mount Usu. During the 1954–1964 period, Showa-Shinzan has been progressively out-gassed, behaving during the post-1964 period as a meteoric water dominated system and decreasing in the temperature of the main fumaroles 1,000 °C to 350 °C.
Hazard Description: not reported
Type: soil_diffuse_emission
Region: Hokkaido Prefecture, Japan
Country: Japan
Volcanic Complex: Showa-Shinzan
Gas Flux Data:
Measurement Name Detail Date Specie Flux Std. Dev. Unit of Measure
Showa-Shinzan_091999 Detail 1999/09/01 CO2 15.6 0 Mg/d
Showa-Shinzan_072002 Detail 2002/07/01 CO2 14 0 Mg/d

Location: Usu (View Details at MaGa DB)
Description: Mt Usu volcano is Hokkaido is one of Japan's most well-known volcanoes. The summit of Usu consists of several lava domes that formed in historic time. The 2000 eruption of Usu volcano was the first in 22 years and followed several days of increased seismicity and ground deformation. A first new vent opened in the West-Nishiyama area on 31 March 2000, followed by activity in the Kompira area on 1 April. Eruptive activity lasted for more than a year and gradually declined until September 2001. The eruptions were phreatic and phreato-magmatic, and caused small pyroclastic flows.
Hazard Description: not reported
Type: soil_diffuse_emission
Region: Hokkaido Prefecture, Japan
Country: Japan
Volcanic Complex: Usu
Gas Flux Data:
Measurement Name Detail Date Specie Flux Std. Dev. Unit of Measure
Usu_091998 Detail 1998/09/01 CO2 120 0 Mg/d
Usu_091999 Detail 1999/09/01 CO2 340 0 Mg/d
Usu_062000 Detail 2000/06/01 CO2 39 0 Mg/d