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==In-situ Stress Estimation==
 
==In-situ Stress Estimation==
 
===Vertical Component===
 
===Vertical Component===
The vertical stress (σv) acting on a horizontal plain can be estimated using the weight of the overlaying layers, as shown below:
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The vertical stress (σv) acting on a horizontal plane can be estimated using the weight of the overlaying layers, as shown below:
    
::<math>\sigma_v = \sigma_z + Pa</math>        (measured in Mega Pascal)  
 
::<math>\sigma_v = \sigma_z + Pa</math>        (measured in Mega Pascal)  

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