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Imaging Salt Diapers and Embedded Voids by Refraction Tomography

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Seismic Direct Dinosaur Indicator (DDI)? ~ present-90 my-65 my Time (myr) ... Reciprocity Anisotropy? Depth Slice Tomograms Conclusions Differential GPS: ... – PowerPoint PPT presentation

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Title: Imaging Salt Diapers and Embedded Voids by Refraction Tomography


1
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
  1. Motivation Objective
  2. S. Utah Hadrosaur Site
  3. Seismic Tomography GPR Experiments
  4. Results Problems

4
Dinosaur Fossil Detection
  • Problem Where are dinosaurs?

Paleontologists dig rocks!
5
Outline
  1. Motivation Objective
  2. S. Utah Hadrosaur Site
  3. Seismic Tomography GPR Experiments
  4. Results Problems

6
Site Location Map
7
View
8
Seismic and GPR Survey Areas
9
Hadrosaur Quarry
10
Outline
  1. Motivation Objective
  2. S. Utah Hadrosaur Site
  3. Seismic Tomography GPR Experiments
  4. Results Problems

11
Site Photographs
12
GPR Survey
13
Outline
  1. Motivation Objective
  2. S. Utah Hadrosaur Site
  3. Seismic Tomography GPR Experiments
  4. Results Problems

14
3-D Velocity Tomogram
15
Comparison with Adjacent Trench
16
Shot Gather (400 Hz)
0 ms
gt80K 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
Preliminary Results
Radar Data
20
Outline
  1. Motivation Objective
  2. S. Utah Hadrosaur Site
  3. Seismic Tomography GPR Experiments
  4. Results Problems

21
Potential Problems
  1. Data Quality Control
  1. Anisotropy
  1. Attenuation

22
Data QC Edit
SHOT

Geophone
23
Data QC Reciprocity
24
Attenuation?
0 ms
25 ms
25
Anisotropy?
Dx0-2 m
Dx2-6 m
Dx0-12 m
-2000
2000
-2000 m/s
-2000 m/s
26
Depth Slice Tomograms
1.5 km/s 0 km/s
0 m 8 m
Z1 m
0 m 8 m
1.5 km/s 0 km/s
Z2 m
0 m 8 m
1.5 km/s 0 km/s
Z3 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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