## ERT(electronic resistivity topograph)-interface impedance

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TingYan
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### ERT(electronic resistivity topograph)-interface impedance

Hello. Does anyone know how to define the interface impedance with the vertical current density and the potential continuity?

geophix
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### Re: ERT(electronic resistivity topograph)-interface impedance

I consider myself an expert on ERT, but I still don't understand your question. Can you explain it a little bit more?

kaminae
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### Re: ERT(electronic resistivity topograph)-interface impedance

I suppose, he means boundary conditions for DC.

TingYan
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### Re: ERT(electronic resistivity topograph)-interface impedance

Hi Geophix and Kaminae, thank you for your reply. I saw a definition of a impedance(the author use the sentence like: with the vertical current density and the potential continuity, the impedance can be defined by ......) in one paper with the equation like: impedance = a constant * the secondary potential divided by (the vertical current density); I have no idea about this definition and why he uses this.

2nd question: I believe the boundary conditions are used on the total potentials while in some paper they use the boundary conditions only on the secondary potentials which i think its wrong. I am confused then.....

Many thanks.

geophix
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### Re: ERT(electronic resistivity topograph)-interface impedance

I believe you are talking about one of the modeling methods in which the total potential is separated into two potentials: primary potential and secondary potential. The primary potential is used to deal with source and receivers in a uniform model, while the secondary potential is caused by variations of the resisitivities. So after removal of the primary potential due to the source (and receiver?) geometry, the modeling and inversion use only the secondary potential field which I suppose dealing with resistivity variations more directly.

TingYan
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### Re: ERT(electronic resistivity topograph)-interface impedance

thank you. I got it. Sorry to reply you so late.

geophix
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### Re: ERT(electronic resistivity topograph)-interface impedance

TingYan wrote:thank you. I got it. Sorry to reply you so late.
Glad to know it works for you now. My pleasure to help.

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