Global Volcanism Program | Image GVP-04611
An explosion from the Beyonesu Rocks at the Myjinsho submarine caldera in Japan's central Izu Islands breaches the sea surface on 23 September 1952. These cock’s tail jets of blocks and ash are characteristic of shallow submarine explosions. This photo was taken 5 seconds after the explosion breached the sea surface; five minutes later the eruption was over and the sea was again calm. The suddenness of these powerful explosions proved to be fatal to 31 people on a research vessel that sailed over the vent the following day.
Photo courtesy of Ryohei Morimoto (University of Tokyo), 1952.