11 9° 30' 



Earthquake Epicenter Symbols 

 Magnitude (Richter) 



o 4.0-4.4 



• 4.5-4.9 

 a 5.0-5.4 



* 5.5-5.9 



a Above 6.0 



Figure 1 1 . Epicenter locations off Southern California of earthquakes 

 of magnitude 4.0 and greater on the Richter Scale occurring 

 between 1934 and 1961. (Data from California State Department 

 of Water Resources, 1964.) 



21 



