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A Geophysical Study: Desert Hot Springs, CA

A Geophysical Study: Desert Hot Springs, CA. Electric and Electromagnetic Response of the Mission Creek Fault Undergraduate research project: Brad Coffey, Ben Drenth, Amber Harris, Shannon Kobs, Mellisa Le, Doug Moore. Introduction. Purpose Location Geology Methods. Purpose.

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A Geophysical Study: Desert Hot Springs, CA

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  1. A Geophysical Study: Desert Hot Springs, CA Electric and Electromagnetic Response of the Mission Creek Fault Undergraduate research project: Brad Coffey, Ben Drenth, Amber Harris, Shannon Kobs, Mellisa Le, Doug Moore

  2. Introduction • Purpose • Location • Geology • Methods

  3. Purpose • Use of electrical and electromagnetic geophysical methods to assess the properties of the Mission Creek Fault and determine the usefulness of these methods in similar areas.

  4. Location

  5. Aerial Photo

  6. Geology

  7. Geophysical Methods • Electrical • Resistivity • Electromagnetic • Very Low Frequency (VLF) • VLF – resistivity (VLF-R) • Horizontal Loop Electromagnetics (HLEM)

  8. Resistivity • Previous Work • Location • Methods • Results • Interpretation • Multielectrode Resistivity 2002

  9. Locations of soundings taken by Chad Lukkarila and Dr. Diehl

  10. Resistivity methods • Schlumberger Arrays • 250 meter maximum spacing • Originally interpreted using Resist3 • New interpretation using Zhody program

  11. Resistivity Cross-section Line

  12. Zhody Layered Model Results N-NE S-SW

  13. Multielectrode Resistivity

  14. Electromagnetics • Very Low Frequency (VLF) • VLF-Resistivity • Horizontal Loop EM (HLEM)

  15. S R P Ez Ex Hy VLF and VLF-R

  16. VLF VLF tilt-angle response Horizontal Conductor

  17. VLF

  18. VLF-R N-NE S-SW

  19. HLEM

  20. HLEM Field Data

  21. HLEM Models

  22. Resistive Overburden Water Table Fault Plane Water Table Model Summary N-NE S-SW 30-50 m

  23. Conclusions • Successful identification of fault location through electrical and electromagnetic methods • Future Work: • Resistive or conductive fault gouge • Interaction of fault and groundwater

  24. Acknowledgements Thanks to Dr. Alex Mayer for his informative talk on the hydrogeology of the Desert Hot Springs Area. A special thanks to Dr. Young for arranging the field trip, leading us in the interpretation of the data, and feeding us at that awesome steak place.

  25. References • ________, 1988. Emix-mm User’s Manual, Interpex Limited, Golden, Colorado, USA. • Karous, M., and S. E. Hjelt (1983) Linear Filtering of VLF Dip-Angle measurements, Geophysical Prospecting, 31: 782-794. • Lukkarila, Chad R., 1999, Refinement of a groundwater flow model: Upper Coachella Valley, Riverside County, California, MS Thesis, Department of Geological Engineering and Sciences, Michigan Technological University • McNeil, J.D. 1988 “Advances in Electromagnetic Methods for Groundwater Studies.” SAGEEP 1988, 252-348. • Proctor, R. J. 1968. Geology of the Desert Hot Springs-Upper Coachella Valley Area, California. Special Report 94 California Division of Mines and Geology, San Fransisco, 50 p. • Reynolds, J. M. 1997. An Introduction to Applied and Environmental Geophysics. John Wiley & Sons, Inc. New York.

  26. Questions?

  27. Photos – Nap Time

  28. Photos – Fun Time

  29. Photos – Miscellaneous

  30. Photos - Miscellaneous

  31. Photos – Miscellaneous

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