420 



F. OMORI : 



the present time into two equal parts, we find that there were 

 in the first o50 years seventeen, and in the second 550 years 

 also seventeen destructive earthquakes. 



TABLE XII. 



Time Distril)iiti()n of Destructive Eartliqnakes in Kyoto. 



23. Strong and small shocks in Kyoto. In Kyoto there have 

 been since the 9th century 228 strong and destructive earth- 

 quakes, whose distribution in time will be evident from fig. 11, 

 the half-century numbers being given in the 3rd column of 

 Table XIII. The total numbers of small earthquakes in Kyoto, 

 which happed in the time interval between the 18th century and 

 the 3rd year of Kei-o (1867), is 1090, the half-century numbers 

 being given in the 4th cohimn of Table XIII. Fig. 9 shows 

 the variation of the general seismic activity in Kyoto from the 

 earliest times, x denoting time in units of 50 years, and y the 

 total seismic activity corresponding to x, obtained by adding 

 together the numbers of small, strong and destructive earth- 

 quakes multiplied by cofficients respectively equal to 1,2 and 2. 



