# Difference between revisions of "Impedance"

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In seismology, impedance of a rock layer is defined as the product of bulk density ''ρ''<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 ''ρ''<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+1}-Z_{1}}{Z_{i+1}+Z_{i}} </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]]. | The angle-dependent reflectivity is given by the [[Zoeppritz equation]]. | ||

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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 *ρ*_{B} and P-wave velocity *V*_{P}:

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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