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Dr. Bradley Carr

Associate Research Scientist | Director (UWNSG), Facility Manager – WyCEHG & FINSE

Dr. Brad Carr, Assistant Research Scientist at the University of Wyoming.Department of Geology and Geophysics & UW Near-Surface Geophysics Instrument Center

Office: ESB 1008
Phone: (307) 761 3884

University of Wyoming
1000 E. University Ave. (Dept. 3006)
Laramie, WY 82071


Geophysics, PhD, University of Wyoming, 1995
Geology and Geophysics, BS, University of Wisconsin-Madison, 1987


Senior Geophysicist, Advanced Geosciences, Inc., Austin, TX, 2006 - 2013
Senior Geophysicist, Geophex, Inc., Raleigh, NC, 2000 – 2006
Postdoctoral Research Scientist in Geophysics Oak Ridge National Laboratory, 1996-1999
Postdoctoral Research Scientist in Geophysics, University of Saskatchewan, 1993-1996


My research focuses on the integrated use & development of near surface geophysical methodologies to understand near-surface material geophysical properties and groundwater recharge/movement in mountain headwater environments, hydrothermal areas, the Earth’s Critical Zone, and contaminated (or threatened) municipal aquifers.

Due to a vast accumulated experience in applied, theoretical and manufacturing near-surface geophysics as well as exploration seismology, I work extensively and often with all current near-surface geophysical instrumentation (i.e. surface/borehole reflection and refraction seismology, surface/borehole/marine DC resistivity - induced polarization - self-potential, borehole geophysical logging, surface/borehole nuclear magnetic resonance, total & gradient Magnetics, multifrequency “shallow” electromagnetics, transient “deep” electromagnetics, controlled source and natural magnetotellurics, ground penetrating radar and gravimetry). Also, I operate and collect soil and rock core samples with the WyCEHG 7822DT Geoprobe drill rig and manage the near-surface materials properties testing lab (Heller Lab) in the basement of the Geology building.

Currently, I have ongoing critical zone and hydrogeophysical research projects in & around Laramie, WY and Yellowstone National Park.

Lastly, I am the Director of the UW Near-Surface Geophysics Instrument Center (UWNSG) as well as the Facility Manager of the Wyoming Center for Environmental Hydrology & Geophysics (WyCEHG) -  FINSE (Facility for Imaging the Near- and Sub-surface Environment) hydrogeophysics group.  The UWNSG is a cost center that: 1) Rents or provides research service for ~ $2.6M of near-surface geophysical, subsurface push sampling/augering/coring, surveying and associated equipment, 2) Training in the use of the near-surface geophysical instrumentation and geophysical software, 3) Rental of software licenses for near-surface geophysical data analysis, and 4) Data planning, acquisition and analysis services by center staff.


GEOL 4717-04 Summer Field Geology Course: Geophysics

Graduate Students

Stephanie Phillips - Ph.D. Candidate

Ang (Leon) Li, Ph.D.

Eva Smith, M.S.

Daniel Ciraula, M.S.

Selected Publications

Riebe, C.S., R.P. Callahan, S.B.M. Granke, B.J. Carr, J.L. Hayes, MS Schell, L.S. Sklar, 2021, Anisovolumetric weathering in granitic saprolite controlled by climate and erosion rates. Geology, DOI: 10.1130/G48191.1.

Leone, J.D., W.S. Holbrook, C.S. Riebe, J. Chorover, T.P. Ferre, B.J. Carr, R.P. Callahan, 2020, Strong slope-aspect control of regolith thickness by bedrock foliation. Earth Surface Processes and Landforms, DOI: 10.1002/esp.4947.

Callahan, R.P., C.S. Riebe, S. Pasquet, KL Ferrier, D. Grana, L.S. Sklar, N.J.Taylor, B.A. Flinchum, J.L. Hayes, B.J. Carr, P.C. Hartsough, A.T. O’Green, W.S. Holbrook, 2020, Subsurface weathering Revealed in Hillslope-Integrated Porosity Distributions. Geophysical Research Letters, DOI: 10.1029/2020GL088322.

Gu, X., G. Mavko, L. Ma, D. Oakley, N. Accardo, B.J. Carr, A.A. Nyblade, S.L. Brantley, 2020, Seismic refraction tracks porosity generation and possible CO2 production at depth under a headwater catchment. Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.2003451117.

Uhlemann, S., B.J. Carr, B. Dafflon, K. Williams, 2020, Geophysical borehole logging data of wells ER-GLS1, ER-GUM1, ER-PLM7, and ER-PLM8 at the East River Watershed, Colorado. OSTI.GOV, DOI: 10.15485/1650355.

Moravec, B.G., A.M. White, R.A. Root, A. Sanchez, Y. Olshansky, B.K. Paras, B.J. Carr, J. McIntosh, J.D. Pelletier, C. Rasmussen, W. S. Holbrook, J. Chorover, 2020, Resolving deep critical zone architecture in complex volcanic terrain. Journal of Geophysical Research: Earth Surface, DOI: 10.1029/2019JF005189.

Holbrook, W.S., V. Marcon, A.R. Bacon, S.L. Brantley, B.J. Carr, B.A. Flinchum, D.D. Richter, C.S. Riebe, 2019, Links between physical and chemical weathering inferred from a 65-m-deep borehole through Earth’s critical zone. Scientific Reports, DOI: 10.1038/s41598-019-40819-9.

Wang, W., P. Chen, I. Keifer, K. Dueker, E.J. Lee, D. Mu, J. Jiao, Y. Zhang, B.J. Carr, 2019, Weathering front under a granite ridge revealed through full-3D seismic ambient noise tomography. Earth and Planetary Science Letters, DOI: 10.1016/j.epsl.2018.12.038.

Ren, S., A.D. Parsekian, Y. Zhang, B.J. Carr, 2019, Hydraulic conductivity calibration of logging NMR in a granite aquifer, Laramie Range, Wyoming. Groundwater, DOI: 10.1111/gwat.12798.

Carey, A.M., G.B. Paige, B.J. Carr, W.S. Holbrook, S.N. Miller, 2019, Characterizing hydrological processes in a semiarid rangeland watershed: A hydrogeophysical approach. Hydrological Processes, DOI: 10.1002/hyp.13361.

Flinchum, B.A., W.S. Holbrook, A.D. Parsekian, B.J. Carr, 2019, Characterizing the critical zone using borehole and surface nuclear magnetic resonance. Vadose Zone Journal, DOI: 10.2136/vzj2018.12.0209.

Flinchum, B.A., W.S. Holbrook, D. Grana, A. Parsekian, B.J. Carr, J. Hayes, J. Jiao, 2018, Estimating the water holding capacity of the critical zone using near-surface geophysics.  Hydrological Processes, DOI: 10.1002/hyp.13260

Ren, S., S. Gragg, Y. Zhang, B.J. Carr, G. Yao, 2018, Borehole characterization of hydraulic properties and groundwater flow in a crystalline fractured aquifer of a headwater mountain watershed, Laramie Range, Wyoming, Journal of Hydrology, 561, 780-795.

Flinchum, B.A., W.S. Holbrook, D. Rempe, S. Moon, C. Riebe, B.J. Carr, J. Hayes, M. Peters, 2018, Critical zone structure under a granite ridge inferred from drilling and three-dimensional seismic refraction data.  Journal of Geophysical Research:  Earth Surface, DOI: 10.1029/2017JF004280

Ren, S., A Parsekian, Y. Zhang, B.J. Carr, 2018,  Hydraulic conductivity calibration of logging NMR in a granite aquifer, Laramie Range, Wyoming.  Groundwater, DOI:  10.1111/gwat.12798

Novitsky, C., W.S. Holbrook, B.J. Carr, S. Pasquet, D. Okaya, B.A. Flinchum, 2018, Mapping inherited fractures in the critical zone using seismic anisotropy from circular surveys. Geophysical Research Letters, DOI: 10.1002/2017GL075976

Parsekian, A.D., Claes, N., Singha, K., Minsley, B.J., Carr, B, Voytek, E., Harmon, R., Kass, M.A., Carey, A., Thayer, D., Flinchum, B., 2017, Comparing measurement response and inverted results of electrical resistivity tomography instruments. Journal of Engineering & Environmental Geophysics, 22(3) 249-266.

Carey, A.M., Paige, G.B., Carr, B.J., and M. Dogan, 2017, Forward modeling to investigate inversion artifacts resulting from surface electrical resistivity tomography during rainfall events. Journal of Applied Geophysics, 145, 39-49.

Pasquet, S., W.S. Holbrook, B.J. Carr, K. W.W. Sims, 2016, Geophysical Imaging of Shallow Degassing in a Yellowstone hydrothermal system, Geophysical Research Letters, 43 (23), 1-9, DOI: 10.1002/2016GL071306

St. Clair, J., Moon, S., Holbrook, W.S., Perron, J.T., Riebe, C.S., Martel, S.J., Carr, B.J., Harman, C., Singha, K., and D. DeB. Richter, 2015. Geophysical imaging reveals topographic stress controls of bedrock weathering: Science, 30 Oct 2015, Vol. 350, Issue 6260, pp. 534-538, DOI: 10.1126/science.aab2210.

Carr, B.J., Lagmanson, M. M. and H. Aktaracki, 2011. The Use of Electrical Imaging to Characterize Contaminated Sites: Geophysical Transactions, Vol. 45, No. 4, pp. 223-231.

Doll, W.E., Carr, B.J. and J.R. Sheehan, and W.A. Mandell, 2005. Overview of Karst Effects and Karst Detection in Seismic Data from the Oak Ridge Reservation, Tennessee: U.S. Geological Survey Karst Interest Group Proceedings, Rapid City, South Dakota, September 12-15, 2005, Scientific Investigations Report: 2005-516, 20-28.

Miller, R.D., Hunter, J.A., Doll, W.E., Carr, B.J., and T.S. Collett, 2004, High-resolution seismic imaging of the hydrate stability zone at the Mallik L-38 research site, Northwest Territories, Canada: Geological Survey of Canada Bulletin 585, 14p.

Nyquist, J. E., Carr, B. J., and R. K. Davis, 1999. DC Resistivity Monitoring of Potassium Permanganate Injected to Oxidize TCE In Situ: Journal of Environmental and Engineering Geophysics, vol. 4, 135-148.

Carr, B. J., and Z. Hajnal, 1999. P- and S-Wave Characterization of Near-Surface Reflectivity from Glacial Tills Using Vertical Seismic Profiles: Geophysics, vol.64, 970-980.

Carr, B. J., Hajnal, Z., and A. Prugger, 1998. Shear Wave Studies in Glacial Till: Geophysics, vol. 63, 1273-1284.

Carr, B.J., Smithson, S. B., Kareav, N., Ronin, A., Garipov, V., Kristofferson, Y., Digranes, P., Smythe, D., and C. Gillen, 1996. Vertical Seismic Profile Results from the Kola Superdeep Borehole, Russia: Tectonophysics, vol. 264, 295-307.

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Department of Geology and Geophysics

1000 E. University Ave.

Laramie, WY 82071-2000

Phone: 307-766-3386

Fax: 307-766-6679


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