NOTES ON JAPANESE EARTHQUAKES. 425 



26. The monthly distribution of 1088 small earthquakes 

 in Kyoto, whose dates are exactly known, is shown in Tables 

 XVIII, XIX and XX, and illustrated in figs. 12 and 14. 

 According to Table XVIII, the maximum monthly number of 

 110 occurred in March, and the minimum of 74 in September, 

 the ratio of the two numbers being as 1.5:1. Comparing fig. 

 12 with fig. 13, we find that for Kyoto the August maximum, 

 which is very well marked in the frequency of the strong earth- 

 quakes, is reduced to a mere trace in the case of the small earth- 

 quakes. According to Table XIX, the maximum seasonal 

 number of 307 occurred in Spring, and the minimum of 252 in 

 Winter, the ratio of the two numbers bring as 1.2:1. 



Finally, according to Table XX, there exists no difference 

 between the number of small earthquakes in Kyoto for the 

 warmer and colder halves of the year. 



The occurrence of minimum frequencies of Kyoto small 

 earthquakes in Autumn and Winter does not agree with the 

 annual variation of ordinary small earthquakes in Japan, illus- 

 trated in fig. 4, which presents the minimum in Summer. There 

 may possibly exist some seismic peculiarity inherent in the region 

 about Kyoto, causing its annual variation to difter from that for 

 other parts of Japan. 



