Negative Magnetic susceptibilities
JoeInman
Posts: 7 
in Oasis montaj
In running VOXI my models end up with some negative magnetic susceptibilities. As was mentioned previously if the RMI has any negative values then negative susceptibilities will follow. I would assume this is due to the background level shift or using the wrong value. When making diurnal, etc. corrections to a base station it is standard to remove the base station values and then add a somewhat arbitrary value to the data, so that the values are in the typical field range...52,000 nT or whatever. Then I remove the IGRF and that becomes RMI until I decide to remove a baselevel or linear or quadratic function regionals. To avoid negative susceptibilities caused by negative RMI why don't I simply determine the minimum value of the RMI and then add that amount back into the field. I assume that would solve the problem except for negatives caused by remnant polarization. Does this make any sense and does anyone have experience with this?
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Comments
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Have you tried setting the lower bound to 0 to remove negative susceptibilities?0
