1 – Ioto, JapanIwo Jima in 45 eruptionsDo remember that the island is now called Ioto. Tallis Rockwell’s view (Crisis on Ioto):Considered to be the most dangerous volcano in the world on this blog, Ioto is quite a temperamental volcano, rising at an average rate of 15-25 cm/yr for more than 500 years. Even forgoing the magma chamber the cone-sheet intrusion has enough magma to produce a high-end VEI 6 or a low-end VEI 7. Ioto, Iwo-Jima, Sulphur Island, whatever you want to call it, is undergoing massive changes over a vast area. The caldera of Ioto is circular or chestnut-shaped (if Suribachiyama forms one end of it), of about 10 by 11 km in size.