Breaking News: Mount Ontake Stratovolcano Erupts Trapping Hikers Near Summit — 36 Dead, 7 Missing, 40 Injured — The Ring of Fire Explodes Once Again — Videos

Posted on September 27, 2014. Filed under: Data, Diasters, Doumentary, Economics, Energy, Enivornment, Geology, media, People, Photos, Science, Vacations, Video, Volcano, Water, Weather, Wisdom | Tags: , , , , , , , , , , , , , , , , , |

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Aerial Japan volcano footage: Mt Ontake spews giant ash cloud, locals flee

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Incredible Footage | Japan’s Mt. #Ontake Volcano Eruption | Sep 27, 2014

RAW: Japanese helicopters rescue hikers on erupting Mt Ontake, over 30 feared dead

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Ontake Volcano Eruption In Japan Ontakesan 27/09/2014 | RAW VIDEO

Mount Ontake Volcano Eruption In Japan RAW VIDEO

Japan’s Mount Ontake volcanic eruption traps hikers

Lack of warning in Japan’s Mt. Ontake volcano eruption raises questions

With all of the technology in place to monitor volcanoes and earthquakes, especially in Japan, it’s a fair question to ask: why was there no warning before the deadly eruptionof Mount Ontake in Japan on Saturday?

Compare Mount Ontake’s eruption to that of the recent lava show of Bardarbunga in Iceland. Seismometers in Iceland detected the potential movement of magma about two weeks in advance of the fissure eruption in the Holuhraun lava field, and officials were issuing warnings to surrounding residents well in advance.

But on Mount Ontake, the only warning hikers received on Saturday was a loud boom, “like thunder,” minutes before a massive ashcloud overtook the mountain.

Though it may seem that Saturday’s eruption took scientists by surprise, there’s probably little else they could have done to prevent the tragedy, at least with the current monitoring equipment. And when it comes to predicting the events themselves, “it depends on the type of eruption,” says Joe Dufek, professor of geophysics at the Georgia Institute of Technology.

Dufek explains that Saturday’s eruption had a large steam component — what scientists call a phreatic eruption. Red hot magma boiled ground water around the volcano until it exploded and was released as steam, launching ash high into the air. Saturday’s phreatic eruption was similar to those seen on Mount Ontake in 1979, 1991, and 2007.

The difficult aspect of this kind of eruption is that it can go virtually undetected. “An eruption like this doesn’t even require magma to move around,” says Dufek, which means that it wouldn’t have been noticeable on seismometers, like the Iceland eruption was.

Of the 110 active volcanoes in Japan, 47 of them are monitored closely by scientists. Mount Ontake is one of them. Scientists have 12 seismometers on the volcano, as well as five GPS instruments and a tiltmeter, used to measure whether or not the ground is moving. Eleven minutes before the eruption, the seismometers showed a volcanic tremor, but neither the GPS nor the tiltmeter showed any changes.

However, some argue that with different monitoring devices, early signs might have been visible to scientists. David Cyranoski of Nature News writes:

Some volcanoes in Japan, although not Ontake, also have devices for measuring gas release. This could, for example, show whether increased amounts of sulphur dioxide are escaping — a possible sign of an imminent eruption. Some volcanoes also have devices for measuring underground electrical conductivity: an increase in conductivity can signal rising water or magma.

While it was possible for officials to have taken some action prior to the eruption — tremors were recorded earlier this month — the question remains whether that kind of precautionary step would be a good idea, especially when there’s very little evidence suggesting there could even be an eruption. “We could just restrict everywhere, but people don’t want that,” said Toshikazu Tanada, the head of volcano research at the Japan National Research Institute for Earth Science, in an interview with Nature News.

There will likely be future conversations in Japan of how to better predict volcanic eruptions, but Dufek cautions that in fairness, the country’s geo-monitoring system is already quite advanced. “There’s not a lot of lead time in this kind of eruption,” said Dufek. “The monitoring in Japan as a whole is probably the densest network anywhere in the world. If anyone could catch it, it would probably be these guys.”

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In 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in Washington, in the United States. The eruption (which was a VEI 5 event) was the only significant one to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California.[1] The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a huge bulge and a fracture system on the mountain’s north slope.

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13 Impressively Beautiful Snowcapped Volcanoes of Japan

s part of the Pacific “Ring of Fire”, Japan is one of the countries in the world with so many active and inactive volcanoes.  These volcanoes whether active or dormant are popular tourist attractions. These volcanoes are scattered in the different parts of the country which is consists of many islands and islets.

Volcanoes included on this article are the snowcapped ones.

1. Mount Fuji

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  • Other name/s: Fuji-san
  • Type: Stratovolcano
  • Elevation: 3,776 meters
  • Last eruption: 1708
  • Location: About kilometers southwest of Tokyo.
  • Activities in the area: Hiking, Paragliding
  • Distinction: It is the mountain in Japan. It is one of Japan’s most famous symbols.

2. Mount Haku

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  • Other name/s: Haku-san
  • Type: Stratovolcano
  • Last eruption: 1659
  • Location: Borders of Gifu, Fukui and Ishikawa Prefectures
  • Activities in the area: Hiking
  • Distinction: It is one of the “Three Holy Mountains” of Japan

3. Mount Yotei

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  • Other name/s: Yoteizan, Yezo Fuji or Ezo Fuji, Makka Nupuri, Mount Shiribeshi
  • Type: Stratovolcano
  • Elevation:  1,898 meters
  • Last eruption: Holocene
  • Location: Shikotsu-Toya National Park in Hokkaido
  • Distinction: One of the 100 Famous Japanese Mountains

4. Mount Iwate

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  • Other name/s: Iwate-san
  • Type: Stratovolcano
  • Location: Southwest of Morioka City, Iwate Prefecture in Tohoku
  • Activities in the area:
  • Distinction: One of the 100 Famous Japanese Mountains

5. Mount Norikura

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  • Other name/s: Norikura-dake
  • Type: Stratovolcano
  • Elevation: 3,026 meters
  • Last eruption: 6870 BC ± 500 yea
  • Location: Borders of Gifu and Nagano Prefectures
  • Distinction: One of the 100 Famous Japanese Mountains and the New 100 Famous Japanese Mountains

6. Mount Ontake

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  • Other name/s: Ontake-san, Mount Kiso Ontake
  • Elevation: 3,063 meters
  • Last eruption: 1980
  • Location: Borders of Otaki and Kiso in Nagano prefectures and Gero in Gifu Prefectures
  • Distinction: It is the second highest volcano in Japan

7. Mount Myoko

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  • Other name/s: Myoko-san
  • Type: Stratovolcano
  • Elevation: 2,446 meters
  • Last eruption: 2360 BC ± 150 years
  • Location: Myoko City, Niigata Prefecture in Honshu Island
  • Distinction: One of the 100 Famous Japanese Mountains
  •                    “Famous Mountain” of Niigata Prefecture

8. Mount Nikko-Shirane

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  • Other name/s: Nikkō-Shirane-san
  • Type: Shield volcano
  • Elevation: 2,578 meters
  • Last eruption: 1890
  • Location: Nikko National Park in central Honshu
  • Activities in the area:
  • Distinction: One of the 100 Famous Japanese Mountains

9. Mount Chokai

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  • Type:  Chokai-san
  • Elevation: 2,237 meters
  • Last eruption: 1974
  • Location: Border of Yamagata and Akita prefectures
  • Activities in the area: Hiking
  • Distinction: It is second tallest mountain in Tohoku region. It is regarded as a sacred mountain by Shugendo. One of the 100 Famous Japanese Mountains

10. Mount Iwaki

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  • Other name/s: Iwaki-san, Tsugaru-Fuji
  • Type: Stratovolcano
  • Elevation: 1,625 meters
  • Last eruption: 1853
  • Location: Western Aomori Prefecture, Tohuko
  • Activities in the area: It can be reach only through hiking
  • Distinction: One of the 100 Famous Japanese Mountains

11. Mount Asama

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  • Other name/s: Asama-yama
  • Type: Complex volcano
  • Elevation:  2,544 meters
  • Last eruption: 2009
  • Location: Gunma and Nagano Prefecture border in Central Honshu
  • Distinction: One of the 100 Famous Japanese Mountains

12. Mount Tate

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  • Other name/s: Tate-yama
  • Elevation: 2,621 meters
  • Last eruption: 1858
  • Location: Southeastern area of Toyama Prefecture
  • Activities in the area: Climbing from April to November
  • Distinction: It is Japan’s “Three Holy Mountains”.
  •       It is one of the tallest peaks in the Hilda Mountains

13. Mount Tateshina

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  • Other name/s: Tateshina-yama, Suwa Fuji
  • Type: Complex volcano
  • Elevation: 2,530 meters
  • Last eruption: Unknown
  • Location: Border of Chino and Tateshina municipalities in Nagano Prefecture
  • Distinction: One of the 100 Famous Japanese Mountains

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