Teaching Near-Surface Geophysics in the Field Sarah Kruse University of South Florida *see notes on...
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Transcript of Teaching Near-Surface Geophysics in the Field Sarah Kruse University of South Florida *see notes on...
Teaching Near-Surface Geophysics in the Field
Sarah KruseUniversity of South Florida
*see notes on Powerpoint file for details
Learning Goalsfor USF B.S. and M.S. students
and workshops in Latin America
Hands-on experience
Using physical intuitionbasic underlying physics
Forward modeling and processing toolbox
Science communicationwriting reportsdiscussing posters
Geophysics field opportunities at USF1. Principles of Applied Geophysics
Field project
Principles of Applied GeophysicsLogistics
Principles of Applied GeophysicsLogistics
Principles of Applied GeophysicsLogistics
Principles of Applied GeophysicsLogistics
Principles of Applied GeophysicsLogistics
Principles of Applied GeophysicsAssessment
toolbox
Principles of Applied GeophysicsData archive
Geophysics field opportunities at USF2. Geophysics Field Camp
Learning GoalsHands-on experience
Using physical intuitionbasic underlying physics
Forward modeling and processing toolbox
Science communication writing reports, combined analysis of multiple methods on site
Geophysics Field CampLogistics
Geophysics Field CampLogistics
$
Geophysics Field CampLogistics
Geophysics Field CampLogistics
Geophysics Field CampLogistics
Geophysics Field Camp
Section heading Sample contentIntroduction Why this site?
Purpose of resistivity/conductivity measurements:Expect to see freshwater/saltwater interface (describe expected conductivity contrast)May see tar mats, buried tar mats (describe expected conductivity contrast)Ground truthing
Methods Equipment: AGI Supersting R8 resistivity meterField geometries: 28 electrodes, 1-m spacingAcquisition parameters: dipole-dipole and inverse Schlumberger array geometries, 2 cycles/readingProcessing software: Res2dinvProcessing steps: Editing data (what % removed, why?), inversion parameters, number of iterations,…
Results Map, position informationDescribe data volume, data qualityRaw data (if appropriate) = pseudosectionProcessed data = inversion Xsection(s)
Discussion On processed data image (preferably second copy), add notations with geologic interpretationsComparisons with ground truthingComparisons with other methods (if available)If appropriate, what didn’t work and why
Strengths and Limitations (of this method)
Finer spatial resolution than EM-31 or EM-34 (be quantitative if possible)Labor-intensive (xx hrs for xx meters of profile)
Assessment
Geophysics Field CampAssessment
Geophysics Field Camp
Geophysics field opportunities at USF3. Field Geophysics
Field GeophysicsLogistics
Field Geophysics
Section heading Sample contentIntroduction Why this site?
Purpose of resistivity/conductivity measurements:Expect to see freshwater/saltwater interface (describe expected conductivity contrast)May see tar mats, buried tar mats (describe expected conductivity contrast)Ground truthing
Methods Equipment: AGI Supersting R8 resistivity meterField geometries: 28 electrodes, 1-m spacingAcquisition parameters: dipole-dipole and inverse Schlumberger array geometries, 2 cycles/readingProcessing software: Res2dinvProcessing steps: Editing data (what % removed, why?), inversion parameters, number of iterations,…
Results Map, position informationDescribe data volume, data qualityRaw data (if appropriate) = pseudosectionProcessed data = inversion Xsection(s)
Discussion On processed data image (preferably second copy), add notations with geologic interpretationsComparisons with ground truthingComparisons with other methods (if available)If appropriate, what didn’t work and why
Strengths and Limitations (of this method)
Finer spatial resolution than EM-31 or EM-34 (be quantitative if possible)Labor-intensive (xx hrs for xx meters of profile)
Assessment
Field Geophysics WorkshopsLatin America
Field Geophysics Workshops Case studies for subsequent students with access
to site but not to equipment
Critical to find sites with some ground-truthing
Field Geophysics Workshops
Field Geophysics Workshops