Abstract

A flank eruption in a radial fissure took place at the basaltic volcano of Miyake-jima, one of the Seven Izu Islands, on August 24, 1962, after a repose of 22 years. The activity lasted only about 28 hours and the total volume of lava and ejecta is estimated to have been about 0.009 km3. But the islanders (population : 6359) became extremely uneasy and nearly 60 % of them sought safety on other islands of Japan, because swarms of severe earthquakes were felt on the island after the eruption.The writer intends here to sketch in broad outline the 1962 eruption and also the characteristics of the volcanism of Miyake-jima in pre-historic and historic times.

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