At any rate, the situation is probably not as dire as some make it out to be, as I explain here:

http://www.democraticunderground.com/?com=view_post&forum=1002&pid=1293034

However, as someone who spends a good piece of each week in Tokyo, I am much more concerned about a major earthquake there. Last year's huge quake, whose epicenter was more than 200 miles away from the central part of Tokyo, was still intensive enough in Tokyo to shut down public transportation, topple floor safes in upper story jewelry shops, and cause upper stories of skyscrapers to sway several feet back and forth.

Of course, Japan is a land of volcanoes, and there have been various volcanic eruptions in the recent past, most notably Mt. Aso on the island of Kyushu, as well the Sakurajima volcano on the same island which occasionally dumps ash on the city of Kagoshima across the bay. There is also Showa Shin-san, Japan's version of Paricutin, and the volcano at Nasu which often has steam rising from its crater.

Finally, the researchers from research organization that put out the report, which is actually practically down the street from me, have stated that "the increase in magma pressure alone is not enough to cause an eruption" but that "there is a need to issue a warning that there is a possibility of an eruption of (Mt. Fuji) after a few years have elapsed since the (Great East Japan) earthquake".

Have on other sections of the fault and nearby volcanos.

In the months following the Big One, there was a noticeable increase in the activity of land-based faults that were relatively close to the epicenter, particularly in Fukushima Prefecture, as well as in neighboring Ibaraki and Miyagi prefectures, and off the coast of Ibaraki and Chiba prefectures (note: These prefectures, or "states", are all in a line along the eastern Pacific coast of Japan). However, there was no real noticeable increase in seismic activity west of that area, except for one relatively powerful earthquake that hit the Shizuoka City area (near Mt. Fuji) shortly after the Big One. In that area, there is also a large fault that runs from the Pacific coast to the Sea of Japan coast, and for years there have been predictions of a major quake hitting that area ("Tokai Daishinzai" in Japanese).

Looking at recent volcanic activity in the area relatively near the 2011 epicenter, I see that the Nasudake volcano at Nasu, more or less on the border between Tochigi and Fukushima prefectures and approximately 100 miles from the epicenter, showed a small spike in activity just before the 2011 earthquake, but its current level of activity is nowhere near the level that it was in, say, the early 1970s.

http://www.seisvol.kishou.go.jp/tokyo/STOCK/monthly_v-act_doc/tokyo/12m03/301_12m03.pdf

Seeing the climate data and realizing there is really no way out at this point, one of my few hopes is that we will see some significant eruptions that can prevent the planet from roasting us all. Granted, I don't like the idea of any nations or peoples suffering the localized catastrophe of a volcano...but if Japan can predict the eruption and prevent it from having a negative impact like the eruption in Iceland a couple of years ago), then it could possibly be a good thing.

They don't need this