Geohazards  
     
     
 
 
 

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Figure 5. The graph on the left hand side of this figure shows three earthquake traces superimposed on a plot of P and S-wave arrival times. The right hand sketch shows these traces superimposed on circles with radii corresponding to the time interval between P and S-wave arrivals.
Where these circles meet marks the epicentre of the earthquake (after Aitken and Lowry 1995).

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