Difference between revisions of "Impedance"

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In seismology, impedance of a rock layer is defined as the product of bulk density ''&rho;''<sub>B</sub> and P-wave velocity ''V''<sub>P</sub>:  
 
In seismology, impedance of a rock layer is defined as the product of bulk density ''&rho;''<sub>B</sub> and P-wave velocity ''V''<sub>P</sub>:  
  
<math>Z_\mathrm{P} = \rho_\mathrm{B} V_\mathrm{P}\ </math>
+
:<math>Z_\mathrm{P} = \rho_\mathrm{B} V_\mathrm{P}\ </math>
  
 
The normal incidence (vertical) reflection coefficient between an upper layer ''i'' and a lower layer ''i'' + 1 is given by
 
The normal incidence (vertical) reflection coefficient between an upper layer ''i'' and a lower layer ''i'' + 1 is given by
  
<math>R_{i} = \frac{Z_{i}-Z_{i+1}}{Z_{i}+Z_{i+1}} </math>
+
:<math>R_{i} = \frac{Z_{i+1}-Z_{1}}{Z_{i+1}+Z_{i}} </math>
 +
 
 +
The angle-dependent reflectivity is given by the [[Zoeppritz equation]].
  
 
==Shear impedance==
 
==Shear impedance==
 
S-wave impedance is the product of bulk density and S-wave velocity
 
S-wave impedance is the product of bulk density and S-wave velocity
  
<math>Z_\mathrm{S} = \rho_\mathrm{B} V_\mathrm{S}\ </math>
+
:<math>Z_\mathrm{S} = \rho_\mathrm{B} V_\mathrm{S}\ </math>
  
 
==Elastic impedance==
 
==Elastic impedance==

Latest revision as of 12:14, 25 June 2014

In seismology, impedance of a rock layer is defined as the product of bulk density ρB and P-wave velocity VP:

The normal incidence (vertical) reflection coefficient between an upper layer i and a lower layer i + 1 is given by

The angle-dependent reflectivity is given by the Zoeppritz equation.

Shear impedance

S-wave impedance is the product of bulk density and S-wave velocity

Elastic impedance

Elastic impedance (EI) is an offset (or angle) dependent property for non-normal angles of incidence. It was first described by Connolly, 1999.

P to S converted wave elastic impedance (PSEI)

Also called Shear wave impedance.

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