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Mount Hakone

Hakoneyama

Complex volcano · Japan · 1438m

Lake Ashi, seen here from the SE, occupies the SW corner of Hakone caldera. Hakoneyama contains two calderas, the largest of which is 10 x 11 km. The arcuate caldera rim is to the left and the flanks of a group of post-caldera cones form the right-hand shoreline. Post-caldera eruptions have constructed a half dozen lava domes along a SW-NE trend across the center of the calderas. An eruption took place around 3,000 years ago and seismic swarms occurred frequently during the 20th century.
Lake Ashi, seen here from the SE, occupies the SW corner of Hakone caldera. Hakoneyama contains two calderas, the largest of which is 10 x 11 km. The arcuate caldera rim is to the left and the flanks of a group of post-caldera cones form the right-hand shoreline. Post-caldera eruptions have constructed a half dozen lava domes along a SW-NE trend across the center of the calderas. An eruption took place around 3,000 years ago and seismic swarms occurred frequently during the 20th century. · Photo: Photo by Lee Siebert, 1963 (Smithsonian Institution). · Wikimedia Commons
Type
Complex volcano
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Elevation
1438m
Coordinates
35.233, 139.021
Last eruption
2015
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

Hakoneyama volcano is truncated by two overlapping calderas, the largest of which is 10 x 11 km wide. The calderas were formed as a result of two major explosive eruptions about 180,000 and 49,000-60,000 years ago. Scenic Lake Ashi lies between the SW caldera wall and a half dozen post-caldera lava domes that were constructed along a NW-SE trend cutting through the center of the calderas. Dome growth occurred progressively to the NW, and the largest and youngest of these, Kamiyama, forms the high point. The calderas are breached to the east by the Hayakawa canyon. A phreatic explosion about 3000 years ago was followed by collapse of the NW side of Kamiyama, damming the Hayakawa valley and creating Lake Ashi. The latest magmatic eruptive activity about 2900 years ago produced a pyroclastic flow and a lava dome in the explosion crater, although phreatic eruptions took place as recently as the 12-13th centuries CE. Seismic swarms have occurred during the 20th century. Lake Ashi, along with the thermal areas in the caldera, is a popular resort destination SW of Tokyo.

From Wikipedia

Mount Hakone , with its highest peak Mount Kami, is a complex volcano in Kanagawa Prefecture, Japan that is truncated by two overlapping calderas, the largest of which is 10 × 11 km wide. The calderas were formed as a result of two major explosive eruptions about 180,000 and 49,000–60,000 years ago. Lake Ashi lies between the southwestern caldera wall and a half dozen post-caldera lava domes that arose along a southwest–northeastern trend cutting through the center of the calderas. Dome growth occurred progressively to the south, and the largest and youngest of them, Mount Kami, forms the high point of Hakone. The calderas are breached to the east by the Haya River canyon. Mount Ashigara is a parasitic cone.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
6000 BCE~5733 BCE · 1 eruptions · max VEI 33863 BCE~3595 BCE · 1 eruptions · max VEI 11458 BCE~1191 BCE · 2 eruptions · max VEI 21191 BCE~924 BCE · 1 eruptions · max VEI ?122 BCE~145 · 1 eruptions · max VEI ?946~1214 · 1 eruptions · max VEI ?1748~2015 · 1 eruptions · max VEI 16000 BCE4130 BCE1992 BCE122 BCE1748

Detailed timeline

  1. 2015VEI 1Observed
    2015-06-29 – 2015-07-01
    Owakudani hot springs, 1 km N of Kamiyama dome
  2. 1170 (±100 yrs)VEI ?Geological estimate
    1170 – Ongoing
    Owakudani
  3. 50 BCEVEI ?Geological estimate
    BCE 50 – Ongoing
    NE of Kamiyama
  4. 1050 BCEVEI ?Geological estimate
    BCE 1050 – Ongoing
    NE of Kamiyama
  5. 1200 BCEVEI 2Geological estimate
    BCE 1200 – Ongoing
    NW side of Kami-yama (Kanmuriga-take)
  6. 1400 BCE (±100 yrs)VEI ?Geological estimate
    BCE 1400 – Ongoing
    NW side of Kami-yama (Kanmuriga-take)
  7. 3700 BCE (±100 yrs)VEI 1Geological estimate
    BCE 3700 – Ongoing
    Futago-yama
  8. 6000 BCE (±100 yrs)VEI 3Geological estimate
    BCE 6000 – Ongoing
    Kami-yama

External links

⚠ For reference only. Not for emergency response.