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Sensitivity study of TEM data at La Bajada Fault

Sensitivity study of TEM data at La Bajada Fault. Tobyn W. VanVeghten University of Missouri-Rolla July 11, 2004. Outline. Objective Methodology with example 1-D results TEM Cross-section constrained by sensitivity analysis WinGLink EMMA and results from EMMA Conclusion. Objective.

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Sensitivity study of TEM data at La Bajada Fault

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  1. Sensitivity study of TEM data at La Bajada Fault Tobyn W. VanVeghten University of Missouri-Rolla July 11, 2004

  2. Outline • Objective • Methodology with example 1-D results • TEM Cross-section constrained by sensitivity analysis WinGLink • EMMA and results from EMMA • Conclusion

  3. Objective • Sensitivity analysis • Constrain TEM data at Canyon Site • Qualitatively in WinGLink • Quantitatively using EMMA

  4. Examples of Raw Data

  5. Sensitivity Test

  6. Sensitivity Test Cont’d

  7. Inverse Models with Error Bars

  8. TEM Cross-Section W E

  9. EMMA • Electromagnetic Model Analysis (EMMA) Program • Developed by the HydroGeophysics Group, University of Aarhus, Denmark • 1-D modeling program for most TEM, FDEM, Resistivity, MT, and borehole methods • Includes model sensitivity analysis *From Auken, Nebel, Sorensen, Breiner, Pellerin, and Christensen, June 2002

  10. EMMA Screenshot

  11. Example of EMMA Results Earlier Results for Comparison

  12. TEM Cross-Section after EMMA E W

  13. Conclusion • Can’t resolve top and bottom resistive layers • Change in character between LB600 and LB650 • Possible fault here

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