ON THE EARTHQUAKE AND VOLCANIC PHENOMENA OF JAPAN. 



97 



From the above we see that the greatest number of earthquakes oc- 

 curred between 3-4 p.m., and the next maximum frequency between 

 4-5 A.M. and between 9-10 p.m. ; whereas the minimum was between 

 9-10 A.M. and between 8-9 p.m. If we took 6 o'clock as the limit between 

 day and night, we should have at night a greater number of earthquakes 

 than during the day by 26. 



3. Areas of Seismic Disturbances and Intensity. 



The area shaken by an earthquake varied from a mere local tract up 

 to an area of several thousand square ri, depending chiefly on the intensity 

 of the shock. In the following table the number of earthquakes during 

 the year has been classified according to the size of the area disturbed. 

 One square ri=5'9 square miles. 



4. Area Shaken during each Month in Square Ri. 



5. Intensity of Earthquahes. 



Of the 630 earthquakes in the year 1S88, severe earthquakes numbered 

 58, moderate ones 264, and feeble ones 308. Thus 9 per cent, of the 

 1892. H 



