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TEM Sounding Across the Tanos Fault Vulcan Quarry Site North Central New Mexico

TEM Sounding Across the Tanos Fault Vulcan Quarry Site North Central New Mexico. Josh Woodworth San Diego State University. Introduction. Objectives Field methods Modeling and limitations Analysis and interpretations. Objectives.

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TEM Sounding Across the Tanos Fault Vulcan Quarry Site North Central New Mexico

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  1. TEM Sounding Across the Tanos FaultVulcanQuarry SiteNorth Central New Mexico Josh Woodworth San Diego State University

  2. Introduction • Objectives • Field methods • Modeling and limitations • Analysis and interpretations

  3. Objectives • Use TEM data with inversion software to model the structure underlying the survey • Determine if a potential aquifer can be resolved with the model • Determine if the mapped fault can be resolved with the model

  4. The Survey • Six soundings conducted back-to-back • 100 m loops • Zonge ZeroTEM transmitter • GDP – 32 receiver • TEM/3 antenna Survey Line Tanos Fault 1 km

  5. TEM Method Transmitter Loop “Smoke Ring” Effect Eddy Current

  6. Survey DataApparent Resistivity (ohm*m) vs. Time (msec) Tan02 Tan03 Tan01 Tan04 Tan05 Tan06

  7. WinGlink Inversion Models 100 102 100 101 Depth (m) 102 101 101 Apparent Resistivity (ohm*m) 100 102 Manual 101 Occam 102 101 10-1 100 101 101 102 Time (msec) Rho (ohm*m)

  8. Cross-section of Survey Area 1900 ELEVAT ION 1800 1700 (m) 1600 0 100 200 300 400 500 DISTANCE (m)

  9. Resolution Using EMMA RESIST THICK DEPTH 100 101 Depth (m) 102 100 101 102 GREEN – Good Resolution Yellow – Moderate Resolution 102 101 Red – No Resolution Rho (ohm*m)

  10. Geologic Cross-section of Vulcan Site (Hawley) Vulcan Well Tanos Fault Recommended Well Site 1820m 1210m 1 km Middle Santa Fe Group Alluvial Fan Deposits

  11. Likely Shallow Subsurface Materials ELEVAT ION (m) Clay Alluvium Gravel DISTANCE (m)

  12. New Vulcan Site Well Data:Analogous to TanosSurvey Area? ~6 km 1850 m 1780 m Water Table 1700 m

  13. 1900 ELEVAT ION 1800 1700 (m) 1600 0 100 200 300 400 500 DISTANCE (m) Interpretation UNRESOLVED Alluvium Clay-rich? Potential Aquifer? + _ Coarser-Grained Alluvium UNRESOLVED Salinity? Clay Content? Porosity?

  14. ? 1900 ELEVAT ION 1800 1700 (m) ? 1600 0 100 200 300 400 500 DISTANCE (m) Tanos Fault ?

  15. Conclusions • Modeling of data supports a fairly uniformly layered subsurface • Conductive to ~150 m • Increasing resistivity with depth below ~150 m • Potential aquifer • Fault is not evident from this model

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