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27 Nov 2019

Another commonly used modulus is the Poisson's ratio which isdefined as the ratio of the transverse strain to the axial strain.In simpler terms the Poisson's ratios, v, measure how muchhorizontal extension, Eyy, a material undergoes given some appliedvertical contaction, Exx. I.e

v=-Eyy/Exx

The Poisson;s ratio has important implicattions for subsurfacerock properties including reservoir and aquifer characterization.Using what you learnded in question 1, and given that Poission'sratio is related to the shear and bulk moduli by:

K=2u(1+v)/3(1-2v)

What does the stated Vs=.55Vp tell us about the poisson'sratio?


IN your own words, why is the vp/vs ratio more useful thanjust Vp or Vs alone?

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