The Activities of Japanese Volcanoes in Recent Years

Abstract

The writer intends here to describe the outline of the volcanic activities in Japan after the World War II, with special reference to the changes in the social conditions of the volcanic areas and to the development of our volcanological observation & research. During the period from 1945 to 1965, the volcanic activities such as eruptions & the so-called volcanic extra-ordinary phenomena were found out at 26 volcanoes of Japan as is shown in Table 1. The locations of those volcanoes are shown in Fig. 1. The destructive eruption has taken place once a year or so on the average, and 70 persons in total were killed by 10 eruptions of 6 volcanoes. But the volcanic activities in our country, as a whole, were rather calm during this period. Besides, it must be noticed that almost all the volcanic activities including very slight volcanic extra-ordinary phenomena are nowadays detected in Japan, and we shall scarcely have unexpected eruptions hereafter.