On the Statistical Properties of Frequency of Earthquakes

[摘要] The occurence of earthquakes was analysed statistically, and found following nature.(1) The great earthquakes in Japan and world have periodicity about forty years.(2) The number of earthquakes in the next day or the month of a day or a month, in which earthquakes occure very often, is rather little, on the contrary, it is rather numerous in the next day or month of these in which earthquakes occurvery seldom.(3) The durability is considerable, and it increases with time.(4) Some consideration was made on these properties.(5) The discussion was made also on the Watanabe's theory of durability.

[学科分类] 大气科学