Professor Takehiro Koyaguchi, Assistant Professor Yujiro Suzuki and others at the Earthquake Research Institute, the University of Tokyo investigated the height and spread of the eruption in a giant eruption using numerical simulations, and the shape and behavior of the eruption differ greatly when the scale of the eruption changes. It revealed that.
Explosive volcanic eruptions emit volcanic ash-rich eruptions that create eruption columns that rise directly above the volcano and pyroclastic flows that flow over the surface of the earth.Smoke over the sky can hinder the operation of aircraft, and pyroclastic flows endanger human life.How the disaster spreads when a giant eruption occurs is a matter of great concern, but we have never directly experienced a giant eruption that forms a caldera, and it is a giant eruption. It was impossible to accurately predict the area affected by the eruption.
Therefore, the group investigated the height and spread of the eruption in a super-giant eruption using numerical simulations.As a result of conducting a three-dimensional fluid simulation developed independently, most of the eruption of the eruption of Mount Pinatubo in 3 forms a smoke column in the sky.It was found that an eruption column and a pyroclastic flow were formed at the same time in an eruption several times larger.When the scale is 1991 times that of Pinatsubo volcano, the eruption flows as a pyroclastic flow, and the eruption called "ash kagura" rises from the upper surface of the pyroclastic flow. It was also clarified for the first time that an ash scab was formed, and it was shown that the shape of the eruption greatly differs depending on the scale of the eruption.
Paper information:[Nature Communications] Understanding the plume dynamics of explosive super-eruptions
