436 



F. OMORI 



TABLE XXIII. 



Yearly Earthquake Numbers in Tokyo. (Between 1876 and 1898). 



The great earthquake numbers for October 1891, March 

 1894, June 1896, and August 1897 were due to the after-shocks 

 of four great earthquakes, which took place respectively in these 

 four months. To obtain proper numbers for the four years con- 

 cerned, the numbers for the above four months have been sub- 

 tracted from the total numbers of the respective years, the 

 remainder in each case being then multiplied by the factor if. 



The results thus obtained, which are entered as modified 

 numbers, have been utilised in drawing the curve of the yearly 

 seismic frequency in Tokyo, fig. 19. The minima occurred in 

 1883 and 1893, and the maxima in 1880, 1889 and 1896. The 



