Japan Overdue for Massive Volcanic Eruption

DW News reports that a catastrophic eruption is brewing in Japan:

One of the most seismically active countries in the world and home to more than 100 active volcanoes, experts say Japan is at risk of a major volcanic eruption that would cause chaos across the nation.
... That event was nearly 100 years ago, but Yoichi Nakamura, a professor of volcanology at Utsunomiya University, north of Tokyo, believes that an eruption on a similar scale is imminent. And a blast with a Volcanic Explosivity Index (VEI) reading of four would cause havoc across large areas of this densely populated nation.

"In recent years, we have not had a big eruption, but I have been researching the history of volcanoes in Japan and the evidence suggests that there is an event of VEI four or three every decade or so, but that has not happened for a long time," he said.

"The last really big eruption was Sakurajima and that was in 1914," he pointed out. "I'm very worried about a major event and the possibility that something serious will occur is increasing year by year."

The fear is that vast reserves of magma are building up beneath the craters of a number of volcanoes across the nation and a serious seismic event could trigger an eruption and the release of torrents of lava and pyroclastic material.

... Should a VEI five event take place [from an eruption of Mt. Fuji], Tokyo would once again be smothered in ash, buildings would collapse under the weight, roads and railways would become impassable and infrastructure would be severely damaged by lava flows. It would take weeks for services to return to normal, he warns, and the cost would be huge.