9.2.2. Magnetic Amplitude Inversion¶
Amplitude data are weakly sensitive to the orientation of magnetization. As a result, the interpretation of amplitude data can be added to the information gained by interpreting TMI data.
Here, we demonstrate the basic steps for forward modeling and inverting magnetic amplitude data. We use GIFtools to create an amplitude data object. Next, amplitude data are predicted using a synthetic model. We then use inversion to recover the synthetic model. Original work on amplitude inversion comes from our colleagues at CSM .
Link to MAG3D documentation
Click any figure to enlarge
184.108.40.206. Step by step¶
If you have already completed the Magnetic Susceptibility Inversion demo, you may advance directly to Step 3. Use the final de-trended data as your data column and use the final recovered model from Step 5 of the previous exercise to predict amplitude data.
- Step 2: Survey and Data
Import the processed TMI data in GIF format from the file TKC_magSynthetic_Survey_noIGRF.mag.
- Step 3: Processing
By default, magnetic data are interpreted as being TMI data. For GIFtools to work with amplitude data, we must create a magnetic amplitude data object using change data type
To create some amplitude data, we will forward model data from an existing model
The recovered effective susceptibility model shows a near-vertical anomaly, in good agreement with the conceptual idea of a vertical kimberlite pipe.