DISTRIBUTION OF EARTHQUAKES IN TIME. 



255 



I 



frequency of earthquakes at the different seasons and 

 months is little more than an extension and critical ex- 

 amination of the results which have been given respect- 

 ing the frequency of earthquakes in regard to the posi- 

 tion of the sun. 



That there is a difference between the number of 

 earthquakes which are felt at one season of the year as 

 compared with those felt at another is a fact which, as 

 seismoscopic observations are extended, is becoming more 

 and more recognised. 



Some of the more important results which were 

 arrived at by Mallet from 5,879 observations made in the 

 northern hemisphere, and 223 in the southern hemisphere, 

 may be expressed as follows : — 





Maxima 



Minima 



Northern Hemisphere . 

 Southern Hemisphere . 



January, also a slight 

 rise in August and 

 October 



November, also May 

 and June 



May, June, and July 



March, extending 

 over one month, 

 also August . 



Julius Schmidt, of Athens, who so carefully examined 

 the earthquakes of eastern Europe, came to the following 

 conclusions : — 



For the earthquakes between 1200 and 1873, a 

 maximum on September 26 and January 17 ; a 

 minimum on December 3 and June 13. 



For the earthquakes between 1873 and 1874, a 

 maximum on March 1 and October I ; a minimum on 

 July 7 and December 15. 



For all the earthquakes of eastern Europe, a maximum 

 on January 3 ; a minimum on July 8, or there was a 

 maximum at perihelion and aphelion. 



