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where  is the unit weight of the overlaying rock [mN/ m3].
 
where  is the unit weight of the overlaying rock [mN/ m3].
 
+
::z is the depth to point below surface [m].
z is the depth to point below surface [m].
   
::k is the ratio of the average horizontal stress to the vertical stress.
 
::k is the ratio of the average horizontal stress to the vertical stress.
  

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