General

EMIX MMPlus allows for foward and inverse modeling of EM data acquired with instruments such as the  GENIE/HLEM or the MAXMIN systemas in terms of layered earth models and thin plate conductors.  EMIX MMPlus can interpret data from both the MAXMIN and GENIE systems

EMIX MMPlus computes the layered earth forward model using the full solution described by H.P.  Patra and K.  Mallick in Geosounding Principles, 2 (1980) published by Elsevier.  The inversion calculation uses the Inman-style ridge regression approach of nonlinear least squares curve fitting. 

The total number of layers for layered earth models is 7.   The program calculations allow for VARIABLE coil spacings and also takes the instrument height into consideration.  A floating constant compensates for the spacing errors in TX and RX separation.

EMIX MMPlus interprets and presents data collected in profile form in terms of both layered earth models and thin plate conductors.  Support for the  GENIE/HLEM is now standard with this package.  The program uses data acquired in the HLEM mode.

EMIX MMPlus lets you divide the data into five segments along the profiles and then fix individual model parameters for each of the four segments.  

The Genie option was developed to accommodate the measurements of the Genie HLEM Instrument.  This instrument is useful in rugged terrain, since it measures total field at two frequencies and combines them to form the "Genie Anomaly".  In addition to allowing EMIX Plus to model this Genie Anomaly, it is also better for MaxMin and other instruments that measire in-phse and quadrature components of the secondary field. The program now has forward and inverse modeling for conductors, instead of a direct inversion.

The dip, depth and conductance of the thin sheet are specified, and the argand diagrams are interpolated to find the in-phase and quadrature values. The Wesley algorithm is used to find the curve shape, using the depth and the angle. The curve is then scaled to yield the in-phase and quadrature responses. In case of the Genie, this is done for the low and the high frequencies and combined to form the Genie Anomaly. This means a starting model can be specified, or manually interpret without using inversion is possible.  It also means that there is a single interpretation for dip angle and width. There is no longer a need to edit thr argand interpretation, since there is now a forward modeling mode.

The response for conductor models can be calculated for all the frequencies without copying the conductor to all the frequencies, effectively "filling" in the synthetic data with the response from the selected conductors. The program does a forward calculation of the conductors to adjust for the frequency and then an inversion to adjust for the base values.  Conductors can also be copied specified frequencies.

Calculated layered earth responses or "filled" conductor responses from the field data can be "removed" from the data by subtracting the synthetic responses from the field data.

Standard Conponents

Emix MM Plus v.3 software and manual