Figure 512

curve.

A plotted vertical electric sounding

1. The person responsible for data interpretation constructs a one-dimensional resistivity depth model based on the available information regarding subsurface conditions.

2. Computer software is used to generate a synthetic vertical electric sounding curve corresponding to the initial one-dimensional model of soil resistivity variation with depth.

3. The computer-generated synthetic vertical sounding curve is then compared to the vertical sounding curve measured in the field.

4. The interpreter then adjusts the initial one-dimensional resistivity model, followed by the generation of a new synthetic vertical sounding curve.

The last forward modeling step is repeated until there is a good fit between the measured vertical electric sounding curve and the synthetic vertical electric sounding curve. Once a good enough fit is achieved, the final one-dimensional resistivity depth model is considered to be a reasonable estimate for the true vertical resistivity distribution.

In recent years, inverse modeling techniques have gained widespread acceptance for use in determining resistivity variations with depth. The inverse computer modeling approach is completely automated, using iterative procedures coupled with optimization protocols to produce a

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