time (myr)
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Time (myr)Time (myr)-90 my -65 my
~present
Seismic Direct Dinosaur Indicator (DDI)?Seismic Direct Dinosaur Indicator (DDI)?
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Imaging Dinosaur Imaging Dinosaur Fossils by Seismic Fossils by Seismic
Tomography and GPRTomography and GPRTravis Crosby, Min Zhou, Dave Sheley, Travis Crosby, Min Zhou, Dave Sheley, Scott Scott
SampsonSampson, Paul Gettings and GT Schuster (U Utah), Paul Gettings and GT Schuster (U Utah)Craig Lipus (Geometrics)Craig Lipus (Geometrics)
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OutlineOutline1.1. Motivation & ObjectiveMotivation & Objective
2.2. S. Utah Hadrosaur Site S. Utah Hadrosaur Site
3.3. Seismic Tomography & GPR Seismic Tomography & GPR ExperimentsExperiments
4.4. Results & ProblemsResults & Problems
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ProblemProblem: Where are dinosaurs?Where are dinosaurs?
Dinosaur Fossil DetectionDinosaur Fossil Detection
Paleontologists dig rocks!Paleontologists dig rocks!
SolutionSolution: Seismic/GPR DDI?Seismic/GPR DDI?
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OutlineOutline1.1. Motivation & ObjectiveMotivation & Objective
2.2. S. Utah Hadrosaur Site S. Utah Hadrosaur Site
3.3. Seismic Tomography & GPR Seismic Tomography & GPR ExperimentsExperiments
4.4. Results & ProblemsResults & Problems
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Site Location MapSite Location Map
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ViewView
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Seismic and GPR Survey AreasSeismic and GPR Survey Areas
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Hadrosaur QuarryHadrosaur Quarry
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OutlineOutline1.1. Motivation & ObjectiveMotivation & Objective
2.2. S. Utah Hadrosaur Site S. Utah Hadrosaur Site
3.3. Seismic Tomography & GPR Seismic Tomography & GPR ExperimentsExperiments
4.4. Results & ProblemsResults & Problems
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Site PhotographsSite Photographs
8 m8 m
0.5
m0.
5 m
24 g
eo/li
ne24
geo
/line 12 m12 m
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GPR SurveyGPR Survey
8 m8 m
0.5
m0.
5 m
24 g
eo/li
ne24
geo
/line 12 m12 m
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OutlineOutline1.1. Motivation & ObjectiveMotivation & Objective
2.2. S. Utah Hadrosaur Site S. Utah Hadrosaur Site
3.3. Seismic Tomography & GPR Seismic Tomography & GPR ExperimentsExperiments
4.4. Results & ProblemsResults & Problems
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3-D Velocity Tomogram3-D Velocity Tomogram
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Comparison with Adjacent Comparison with Adjacent TrenchTrench
11.2 ft11.2 ft
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Shot Gather (400 Hz)Shot Gather (400 Hz)0 ms0 ms
60 ms60 ms
>80K Traveltime Picks>80K Traveltime Picks3D Traveltime Tomography3D Traveltime Tomography1-2 m Wavelength1-2 m Wavelength
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Residual vs Iter. #Residual vs Iter. #1.8 ms1.8 ms
1.6 ms1.6 ms11 2020Iteration #Iteration #
RM
S R
esid
ual
RM
S R
esid
ual
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0 m0 m
3 m3 m
0 m0 m
3m3m
0 m0 m
3 m3 m
N-S Vertical Section TomogramsN-S Vertical Section Tomograms
0 m 12 m0 m 12 m
1.5 km/s1.5 km/s
0 km/s0 km/s
1.5 km/s1.5 km/s
0 km/s0 km/s
1.5 km/s1.5 km/s
0 km/s0 km/s
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Preliminary ResultsPreliminary Results
0.00 1.25 2.50 3.75 5.00 6.25 7.50
0
2
4
6
8
10
Position in metres
Dept
h in
met
res
LINE 7.5 Depth Section
0.00 1.25 2.50 3.75 5.00 6.25 7.50
-2
0
2
4
6
8
Position in metres
Dept
h in
met
res
LINE8.5 Depth Section
Radar Data
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OutlineOutline1.1. Motivation & ObjectiveMotivation & Objective
2.2. S. Utah Hadrosaur Site S. Utah Hadrosaur Site
3.3. Seismic Tomography & GPR Seismic Tomography & GPR ExperimentsExperiments
4.4. Results & ProblemsResults & Problems
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Potential ProblemsPotential Problems1.1.Data Quality ControlData Quality Control
1.1.AnisotropyAnisotropy
1.1.AttenuationAttenuation
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Geophone #Geophone #
SHO
T #
SHO
T #
Data QC:Data QC: EditEdit
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Data QC: ReciprocityData QC: Reciprocity
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Attenuation?Attenuation?0 ms0 ms
25 ms25 ms
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-2000-2000 20002000-2000 m/s-2000 m/s -2000 m/s-2000 m/s
-1500-1500
150015001500 m/s1500 m/s
-1500 m/s-1500 m/s-2000 m/s 2000 m/s-2000 m/s 2000 m/s
AnisotropyAnisotropy??
Dx=0-2 mDx=0-2 m
Dx=2-6 mDx=2-6 m
Dx=0-12 mDx=0-12 m
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0 m0 m
8 m8 m
0 m0 m
8 m8 m
0 m0 m
8 m8 m
Depth Slice TomogramsDepth Slice TomogramsZ=1 m
Z=2 m
Z=3 m
0 m 12 m0 m 12 m
1.5 km/s1.5 km/s
0 km/s0 km/s
1.5 km/s1.5 km/s
0 km/s0 km/s
1.5 km/s1.5 km/s
0 km/s0 km/s
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ConclusionsConclusions
• Seismic Tomography not DDISeismic Tomography not DDI
• Seismic Tomography IDDISeismic Tomography IDDI
• GPR PreliminaryGPR Preliminary• Near-Surface Problems:Near-Surface Problems: Attenuation, Anisotropy, QCAttenuation, Anisotropy, QC Is a hadrosaur fossil low or Hi velocity?Is a hadrosaur fossil low or Hi velocity?
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Differential GPS: cm AccuracyDifferential GPS: cm Accuracy