Fischer Inversions

The singular advantage of a Fischer-type inversion is that it does not rely on a starting model. Rather, it makes direct use of the CSAMT data for information regarding layering. A typical use of the Fischer inversion is to determine how many layers can be resolved with the existing data; generally, the layers are visually obvious in the inversion (see fig. 4). These results are then used to help build a Marquardt starting model and then iterated to a true inversion (Fischer and others, 1981; Pedersen and Gharibi, 2000).

All Fischer inversions were done for the TE = XY orientation. Station MSH-1001 is identical to station MSH-1002, and station MSH-1003 is identical to station MSH-1004 (two sets of repeated measurements not duplicated here).