[Asahi] Possibility of massive volcanic eruption in Japan

<Quote> [Asahi]
Japan should brace for a catastrophic volcanic eruption at some point, say experts, citing a massive buildup of magma at many of the nation’s 110 active volcanoes.
The researchers said seismic activity surged at 20 active volcanoes around Japan, including Mount Fuji, after the magnitude-9.0 Great East Japan Earthquake struck last year.
It was one of the most powerful earthquakes on record. It struck with such force that the Japanese land mass shifted.
Over the past century, volcanic eruptions around the world were apparently triggered by magnitude-9.0 or stronger earthquakes that struck several years earlier.
Nakamura also is involved with the nonprofit Vocanological Society of Japan. He said the study was intended to help local officials prepare for a contingency resulting from a major eruption by assessing the risks posed by volcanoes around the country.
Particularly worrisome, he said, was a lack of data pointing to a reduction in magma. In the absence of a really huge eruption for a century suggested there was a massive buildup of magma, which at some point will inevitably spew from a volcano with tremendous force.
According to the study, 1,162 eruptions have occurred in Japan over the past 2,000 years. Of these, 52 were major events that spewed a massive volume of ash and lava over a short period. It amounts to a large-scale eruption occurring every 38 years.
Records show that three volcanic eruptions in the 17th century, including one at Mount Hokkaido-Komagadake in Hokkaido in 1640, spewed out the equivalent of 1 billion cubic meters of ash and lava.
Two similar eruptions occurred in the 18th century, one of which involved Mount Fuji in 1707.
The study showed that relatively large eruptions occurred 124 times.
There were 562 instances of medium-scale eruptions, or one every 3.6 years.
Mount Fuji has erupted 38 times.


Français :

[Asahi] Possibilité d’une éruption volcanique majeure au Japon

<Citation> [Asahi]
Le Japon devrait s’armer contre une éruption volcanique catastrophique disent les experts, indiquant des montées importantes de magma dans de nombreux volcans actifs des 110 du pays.
Les chercheurs disent que l’activité sismique est en augmentation pour 20 volcans actifs du Japon, dont le Mont Fuji, depuis le grand tremblement de terre de l’Est du Japon qui a frappé l’an dernier.
Ce fut un des plus puissants séismes jamais enregistrés. Il a été d’une telle violence que tout le Japon en a été déplacé.
Au cours du siècle dernier, les éruptions volcaniques qui ont eu lieu sur la planète étaient apparemment déclenchés par des séismes de magnitude 9 ou plus survenus les années précédentes.
M. Nakamura est aussi impliqué dans la société à but non lucratif  Vocanological Society of Japan. Il a dit que l’étude avait pour but d’aider les décideurs locaux à se préparer à l’éventualité des conséquences d’une éruption majeure en estimant les risques liés aux volcans de tout le pays.
Ce qui est particulièrement inquiétant est la rareté des données indiquant une réduction du magma. L’absence d’éruption vraiment énorme depuis un siècle suggère qu’il y a eu d’énormes montées de magma, qui, à un moment donné, finiront forcément par sortir par un volcan avec une violence inouïe.
Selon cette étude, il y a eu 1 162 éruptions au Japon au cours des 2 000 dernières années. De celles-ci, 52 ont été des événements majeurs qui ont émis d’énormes volumes de cendres et de laves pendant une courte période. On a ainsi connu une grosse éruption tous les 38 ans.
Les données montrent que trois éruptions volcaniques sont survenues au cours du 17e siècle, dont une, au Mont Hokkaido-Komagadake sur l’île d’Hokkaido en 1640, a émis l’équivalent d’un milliard de mètres cubes de cendres et de laves.
Deux éruptions similaires ont eu lieu au 18e siècle, dont une au Mont Fuji en 1707.
Les études ont montré que des éruptions relativement importantes se sont produites 124 fois.
Il y a eu 562 cas d’éruptions de moyenne importance, soit une tous les 3.6 ans.
Le Mont Fuji a connu 38 éruptions.

About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


December 2012