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Time (myr)

present. -65 my. Seismic Direct Dinosaur Indicator (DDI)?. ~. -90 my. Time (myr). Imaging Dinosaur Fossils by Seismic Tomography and GPR. Travis Crosby, Min Zhou, Dave Sheley, Scott Sampson , Paul Gettings and GT Schuster (U Utah) Craig Lipus (Geometrics). Outline.

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Time (myr)

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  1. present -65 my Seismic Direct Dinosaur Indicator (DDI)? ~ -90 my Time (myr)

  2. Imaging Dinosaur Fossils by Seismic Tomography and GPR Travis Crosby, Min Zhou, Dave Sheley, Scott Sampson, Paul Gettings and GT Schuster (U Utah) Craig Lipus (Geometrics)

  3. Outline • Motivation & Objective • S. Utah Hadrosaur Site • Seismic Tomography & GPR Experiments • Results & Problems

  4. Solution: Seismic/GPR DDI? Dinosaur Fossil Detection Problem: Where are dinosaurs? Paleontologists dig rocks!

  5. Outline • Motivation & Objective • S. Utah Hadrosaur Site • Seismic Tomography & GPR Experiments • Results & Problems

  6. Site Location Map

  7. View

  8. Seismic and GPR Survey Areas

  9. Hadrosaur Quarry

  10. Outline • Motivation & Objective • S. Utah Hadrosaur Site • Seismic Tomography & GPR Experiments • Results & Problems

  11. 0.5 m 12 m 24 geo/line 8 m Site Photographs

  12. 0.5 m 12 m 24 geo/line 8 m GPR Survey

  13. Outline • Motivation & Objective • S. Utah Hadrosaur Site • Seismic Tomography & GPR Experiments • Results & Problems

  14. 3-D Velocity Tomogram

  15. 11.2 ft Comparison with Adjacent Trench

  16. Shot Gather (400 Hz) 0 ms >80K Traveltime Picks 3D Traveltime Tomography 1-2 m Wavelength 60 ms

  17. Residual vs Iter. # 1.8 ms RMS Residual 1.6 ms 1 20 Iteration #

  18. N-S Vertical Section Tomograms 1.5 km/s 0 km/s 0 m 3 m 0 m 3m 1.5 km/s 0 km/s 0 m 3 m 1.5 km/s 0 km/s 0 m 12 m

  19. Radar Data Preliminary Results

  20. Outline • Motivation & Objective • S. Utah Hadrosaur Site • Seismic Tomography & GPR Experiments • Results & Problems

  21. Potential Problems Data Quality Control Anisotropy Attenuation

  22. Data QC:Edit SHOT # Geophone #

  23. Data QC: Reciprocity

  24. Attenuation? 0 ms 25 ms

  25. 1500 m/s 1500 -1500 -1500 m/s -2000 m/s 2000 m/s Anisotropy? Dx=0-2 m Dx=2-6 m Dx=0-12 m -2000 -2000 m/s 2000 -2000 m/s

  26. Depth Slice Tomograms 1.5 km/s 0 km/s 0 m 8 m Z=1 m 0 m 8 m 1.5 km/s 0 km/s Z=2 m 0 m 8 m 1.5 km/s 0 km/s Z=3 m 0 m 12 m

  27. Conclusions • Seismic Tomography not DDI • Seismic Tomography IDDI • GPR Preliminary • Near-Surface Problems: • Attenuation, Anisotropy, QC • Is a hadrosaur fossil low or Hi velocity?

  28. Differential GPS: cm Accuracy

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