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