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Normalized Sensitivity

In addition to saving a Resistivity File (.resistivity) for each inversion iteration, MARE2DEM will save a <model name>.<iteration #>.sensistivity file that has the normalized data sensitivity computed by summing the Jacobian matrix columnwise over all n data:

Sj=1Ajin|WiiJij|

where

Jij=dimj,

Wii is the inverse standard error for the ith datum, and Aj is the area of the jth free parameter. The normalization by the parameter area decouples the sensitivity from the size of each parameter. Normalize S has units log10(S/m)/m2.

The sensitivity can be used as a relative measure of data sensitivity to structure, but be aware this is a linearized approximation for what is a non-linear inverse problem, so sensitivity plots should be taken with a grain of salt.