41S F. OMORi : 



as follows. The provinces on the concave or Japan-Sea side of 

 the arc were disturbed almost only by local shocks ; while those 

 on the convex or Pacific side of the arc were often disturbed 

 by great 7ion-local ones, whose origins were situated in the Ocean 

 and which caused sometimes fearful sea-waves. Of the provinces 

 in the central portion of the Main Island, Mino, Shinano, 

 Shimotsuke and Iwashiro become often the seats of local des- 

 tructive earthquakes. But the two other provinces of Kotsuke 

 and Hida were very seldom disturbed by destructive earthquakes, 

 and form, together with Tajima and a few provinces in Sanyo-do, 

 tlie regions seismically most stable in the Main Island. 



20. The figures in the 14th column of Table X give, for 

 different provinces, the average intervals of time between tAvo 

 successive destructive earthquakes, as deduced from the numbers 

 in the 3rd column of the same Table. Among others, the mean 

 interval is for Musashi 21 years, and for Sagami 27 years. 



VI. Kyoto Earthquakes. 



21. Kyoto was the capital of the Empire during the 1070 years 

 between 797 and 1867. The records of earthquakes in this city 

 is therefore most complete, and includes 1308 shocks, of which 

 34 were destructive, 194 strong, and the remaining 1090 slight. 



I shall consider the seismicity in Kyoto under the following 

 three heads : firstly, destructive earthquakes ; secondly, strong 

 and slight earthquakes ; and thirdly, the annual variation of 

 seismic frequency. 



22. Destructive earthquakes in Kyoto. In Kyoto, there have 

 been since the 9th century (Table XI) 34 destructive earthquakes, 

 which happened therefore on the average once in about 30 

 years. Their distribution in time is illustrated in fig. 10. 



