256 



EARTHQUAKES. 



When the months are grouped together according to 

 the seasons, spring, summer, autumn, and winter, we 

 find that in the northern hemisphere the minimum is 

 in summer and the maximum in winter, whilst in the 

 southern hemisphere (giving the proper months corre- 

 sponding to its seasons) we find two maxima, one at the 

 commencement of winter, and the other at midsummer, 

 whilst the minima are in spring and autumn. 





















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F MAM J J AS ON D 



Fig. 36, — Curves of Monthly Seismic Intensity (Mallet). 



In the following table the difference in the number of 

 earthquakes felt at dififerent seasons is given more in 

 detail. 



In examining this table, we must remember that for 

 countries like Peru, Chili, and New Zealand, lying in the 

 southern hemisphere, the records given for the months 

 April to September correspond to the winter months of 



