INTERNATIONAL ASPECTS OF OCEANOGRAPHY 



IN MOST CASES ONE SYMBOL STANDS 

 fOR A FEW OR EVEN MANY SHOCKS 

 ® STRONG SHOCKS 

 FREQUENT IN THAT REGION 

 • OCCASIONALLY STRONG 

 SHOCKS IN THAT REGION 



O OCCASIONALLY MEDIUM 

 SIZE SHOCKS ABOUT LIKE 

 THE LONG BEACH SHOCK BUT 



STRONG SHOCKS LESS FREQUENT 

 + OCCASIONALLY 

 SHOCKS BUT NO 

 RECENT STRONG 

 SHOCKS 



Pacific Ocean, Earthquake Epicenters 

 (Base chart, after A. Defant.) 



