A Kobe College staff has found that the 7,300-year-old volcanic eruption is the biggest one within the final 11,700 years.
As per the high-resolution marine seismic reflection surveys, the uppermost unit exhibiting outstanding seismic facies thins radially away from the caldera and covers over 4500 sq. meters of the seafloor. The estimated quantity of the submarine deposits is over 71 km3 based mostly on the isopach map.