Colorado School of Mines
Department of Geophysics
Golden, CO 80401
303-384-2329
rkrahenb@mines.edu

Research interests

  • Time-Lapse Monitoring
  • Gravity & Magnetics Methods
  • CO2 Sequestration
  • Geothermal
  • Exploration in Oil, Gas, Mining
  • Unexploded Ordnance (UXO) Detection 
  • Geoscientists Without Borders
  • Humanitarian Engineering and Science
  • Volcanic Monitoring
  • Archaeological Geophysics
  • Landslide Hazards
  • Agricultural Geophysics

teaching

CURRENT

  • Applied Geophysics
  • Geophysical Data Analysis
  • Field Camp / Summer Field
  • Senior Design

PREVIOUS

  • Gravity & Magnetic Methods
  • Geophysical Field Methods
  • Geophysics for UXO Detection & Discrimination
  • Geophysical Data Integration (GPGN599)
  • Geology Field Methods (Geophysics Module)

COURSE DEVELOPMENT FOR OTHER INSTITUTIONS

  • Exploration Geophysics
  • Advanced Potential Fields
  • Advanced Seismology
  • Tectonics / Geodynamics

research projects:  grants

  • 2020 – 2024     $780K              PI      UNSA/MINES Phase II: Agriculturally induced landslides in Peru
  • 2019 – 2020     $1.12M            PI      UNSA/MINES Phase I:  Agriculturally induced landslides in Peru. Geophysics, Geology, Hydrological Modeling, Photogrammetry
  • 2018 – 2020     $8M           Co-PI      DARPA [Underminer]:  Advanced Rapid Tactical Tunneling Operations (ARTTO)
  • 2018 – 2020     $99K         Co-PI      Geoscientists Without Borders: Low-cost geophysical instrumentation, Water in Africa
  • 2016 – 2020     $1.1M       Co-PI      DOE-NETL: Charged wellbore casing controlled source EM for CO2 sequestration monitoring
  • 2014                     $55K                  PI      Northern Solutions: Modeling/Analysis of borehole gravity for reservoir monitoring at Prudhoe Bay
  • 2013 – 2014     $25K                 PI      Anadarko: Imaging base of salt with gravity data
  • 2012 – 2013     $100K              PI      BP Exploration (Alaska): Modeling, simulation, inversion of multiple geophysical data for MBE detection
  • 2011 – 2013     $318K      Co-PI      NASA-LASER:  Crustal structure and formation mechanism of lunar multi-ring basins
  • 2011                     $225K               PI      BP Alternative Energy: Inversion of borehole time-lapse gravity & simulation data for optimal survey design
  • 2010                     $30K                  PI      ConocoPhillips: Time-lapse gravity for monitoring CO2 sequestration
  • 2008 – 2009     $457K              PI      SERDP: Advanced UXO detection, discrimination and identification using magnetic data
  • 2008 – 2009     $98K         Co-PI      SERDP: Enhancement of Transient Electro-Magnetic data and noise characterization by PCA
  • 2008 – 2009     $72K         Co-PI      SERDP: Enhancement of magnetic data by stable downward continuation for UXO application
  • 1999 – Present                     Co-PI      Gravity and Magnetics Research Consortium (GMRC)
  • 1999 – Present                     Co-PI      Center for Gravity, Electrical and Magnetic Studies (CGEM)

research projects:  consortium & research center

Research performed within the Gravity & Magnetics Research Consortium [GMRC], and the Center for Gravity, Electrical & Magnetic Studies [CGEM]

 

  • Monitoring CCS-EOR with 4D gravity
  • Robust parametric inversion by adaptive quenched simulated annealing (AQSA)
  • Joint analysis of time-lapse gravity and production data for a gas reservoir
  • Integration of seismic and reservoir data with surface & borehole gravity for reservoir monitoring
  • Reservoir simulation modeling: making the link from reservoir simulators to gravity, electrical, and EM methods
  • Adaptive data sampling of large scale geophysical datasets for compressive inversion
  • Borehole vector gravity for monitoring water movement
  • Matrix bypass event (MBE) detection by gravity, electrical and EM methods
  • SAGD monitoring with gravity and gravity gradiometry data
  • Development and application of global and hybrid optimization techniques for geophysical inversion
  • Regularization, model weighting, and solution appraisal for 3D inversion of geophysical data
  • Tunnel detection
  • Advancing 3D and 4D model development for robust geophysical experiments
  • Influence of self-demagnetization effect on data interpretation in strongly magnetic environments
  • Gravity, magnetic, and DC/IP modeling of willemite deposits in Brazil and Australia
  • UXO shape identification through recovery of multipole moment
  • Detection of UXO in strongly magnetic environments by extended Euler deconvolution
  • Enhancement of magnetic data by stable downward continuation for UXO application
  • Global optimization
  • Hybrid optimization for lithologic inversion and time-lapse monitoring using a binary formulation (awarded SEG Best Student presentation)
  • Joint inversion of surface & borehole 4D gravity data for continuous characterization of fluid contact movement
  • 3D inversion of magnetic data with self-demagnetization

Undergraduate research projects

Exciting projects I have secured and advised for our undergraduates to acquire research experience at MINES: 

  • Hawaii Volcanoes National Park. Three projects on Kilauea volcano within the caldera and lower flow field, and one at Kahuku archaeology site
  • Historic preservation at Astor House Yard, City of Golden, CO
  • Historic preservation, detection of mass graves at Roselawn Cemetery, Pueblo, CO
  • Historic preservation at Russell Gulch Cemetery, Gilpin County Historical Society, CO
  • Archaeological geophysics at Tahosa Creek / High Peak Camp, Colorado
  • Historic preservation at the Lake George Cemetery, Park County, Colorado
  • Archaeological geophysics at Ludlow massacre site, Colorado
  • Archaeological geophysics at Chaco Canyon National Park, New Mexico
  • Archaeological geophysics at Chimney Rock Great House, Colorado
  • Archaeological geophysics at Basketmaker III community, Crow Canyon Archaeological Center, Colorado
  • Archaeological geophysics at Hidden Tower Village Site, Colorado

educational contributions outside of teaching

Secured through proposals a large collection of geophysical equipment for labs and field education in the Department of Geophysics at Colorado School of Mines: 

  • GEM-2 Multi-frequency electromagnetic (FEM) ground conductivity meter
  • CG-5 Gravity Meter by Scintrex
  • Geode In-Field Seismograph by Geometrics
  • Pulse EKKO Ground Penetrating Radar (GPR) System by Sensors & Software, Inc
  • GSMP-40 Potassium Magnetic Gradiometer by GEM System
  • MRS-MIDI surface-NMR (SNMR)System by Radic-Research
  • EM-34 Ground Conductivity Meter by Geonics, Ltd
  • EM-63 Full Transient ElectroMagnetic Sounder, Geonics
  • SuperSting 28 Channel Resistivity/IP Meter by AGI, Inc.
  • Differential GPS/GNSS System by Trimble (R10 base/rover)
  • Field laptops for Department of Geophysics labs and Field Camp
  • Res2DInv + Res3DInv DCIP modeling and inversion software
  • Mines Geophysics Discovery Lab (GDL) at Kafadar, design and build

books & book contributions

  • Book:  Gravity and magnetic methods in mineral and oil & gas exploration and production. EAGE Education tour series. Li, Y. & R.A. Krahenbuhl, 2015
  • Book Contribution:    Chapter 36, Evaluating time-lapse borehole gravity for CO2 plume detection at SECARB Cranfield, in K.F. Gerdes, eds., Carbon Dioxide Capture for Storage in Deep Geologic Formations – Results for the CO2 Capture Project, Volume 4, CCS Technology Development and Demonstration Results, CPL Press, Berks, UK.  Dodds, K., R.A. Krahenbuhl, A. Reitz, Y. Li, and S. Hovorka, 2015, 
  • Thesis: Binary inversion of gravity data. Krahenbuhl, R.A., 2005

publications & conference oroceedings

  • Flamme, H., D. Sirota, R. Krahenbuhl, Y. Li, B. Dugan, J Shragge, E.G. Zenteno, J.R.T. Paucara, A.M. Lizarraga, 2020, Geophysical Investigation to Understand Local Geology and Agricultural Water Movement in Relation to Landslide Activity in Majes, Peru. 90th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  • Ziehm, T., J. McCaskill, R. Krahenbuhl, and M. Slaughter, 2020, Geophysical investigation for unmarked graves at the Russell gulch cemetery in Colorado. Symposium on the Application of Geophysics for Environmental and Engineering Problems
  • Bonn, P., D. Mayes, E. Moren, A. Kadyanto, R. Krahenbuhl, and M. Slaughter, 2020, Geophysical archaeological investigation of a mass grave site at Roselawn Cemetery in Pueblo, Colorado. Symposium on the Application of Geophysics for Environmental and Engineering Problems

  • Flamme, H., D. Sirota, G. Crookston, R. Krahenbuhl, B. Passerella, 2020, Initial data collection and characterization of the new geophysical discovery lab at Colorado School of Mines. Symposium on the Application of Geophysics for Environmental and Engineering Problems

  • Flamme, H., R. Krahenbuhl, Y. Li, E.G. Zenteno, J.R.T. Paucara, A.M. Lizarraga, 2020, Understanding local geology and subsurface movement of irrigation waters in relation to anthropogenically induced landslides at the Majes agricultural site Peru. Symposium on the Application of Geophysics for Environmental and Engineering Problems

  • Sirota, D., J. Shragge, R. Krahenbuhl, and A. Swidinsky, 2020, Validating low-cost dc resistivity instrument design for low-cost humanitarian geophysics. Symposium on the Application of Geophysics for Environmental and Engineering Problems

  • Krahenbuhl, R.A., A. Reitz, Y. Li, H. Rim, and S. Wagner, 2019: Time-lapse borehole vector gravity for reservoir monitoring. 89th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Krahenbuhl, R.A., Y. Li, W. A. McAliley, N. Moodie, T. Irons, and B.R. Bloss, 2019: Integrated Model Construction for CO2-EOR Monitoring via Charged-Wellbore Casing Controlled-Source Electromagnetics. 89th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • McAliley, W. A., B.R. Bloss, T. Irons, N. Moodie, Krahenbuhl, R.A., and Y. Li, 2019: Analysis of land-based CSEM data for CO2 monitoring at Bell Creek, MT. 89th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Sirota, D., R.A. Krahenbuhl, J. Shragge, and A. Swidinski, 2019, Low-cost DC resistivity instrument design for humanitarian geophysics. Symposium on the Application of Geophysics for Environmental and Engineering Problems

  • Krahenbuhl, R.A., B. Passerella, H. Flamme, G. Crookston, D. Sirota, 2018: Developing a large underground geophysical education laboratory at Colorado School of Mines. 88th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Li, Y., R.A. Krahenbuhl, J. Capriotti, 2018: Time-lapse gravity: A versatile method for monitoring dynamic processes. International Symposium on Deep Earth Exploration and Practices (DEEP). Session level invited keynote presentation

  • McAliley. W.A., R. Krahenbuhl, T. Irons, B. Bloss, N. Moodie, Y. Li, 2018: Time-lapse charged wellbore casing controlled source electromagnetic surveys for monitoring injected carbon dioxide. Annual Meeting, American Geophysical Union

  • Irons, T., N. Moodie, A. McAliley, R. Krahenbuhl, B. Bloss, K. Zamudio, and M. Pace, 2018: Validation and development of multiphase reservoir simulations with controlled source electromagnetics. Annual Meeting, American Geophysical Union

  • Moodie, N., Trevor Irons, Andy McAliley, Richard Krahenbuhl, Yaoguo Li, Benjamin Bloss, 2018: Devising a framework to couple electromagnetic geophysical measurements with reservoir simulations to monitor CO2 plume movement. Annual Meeting, American Geophysical Union

  • Krahenbuhl, R.A., B. Passerella, H. Flamme, G. Crookston, 2018: Building a large, outdoor, underground geophysical education laboratory at Colorado School of Mines. Symposium on the Application of Geophysics for Environmental and Engineering Problems; Geophysics Education Section.

  • Krahenbuhl, R., and Y. Li, 2017, Investigation of magnetic inversion methods in highly magnetic environments under strong self-demagnetization effect. Geophysics, 82, 6, 1-15

  • Yin, Q., R. Krahenbuhl, Y. Li, S. Wagner, and J. Brady, 2017, Integrating time-lapse gravity and reservoir simulation data at Prudhoe Bay for new understanding. Symposium on the Application of Geophysics for Environmental and Engineering Problems

  • Li, Y., J. Capriotti, and R. Krahenbuhl, 2016, Inversion of time-lapse gravity data for reservoir monitoring. 78th EAGE Conference and Exhibition. Workshop: Potential fields and their gradient tensors in the integrated inversion of geophysical data – new advances

  • Krahenbuhl, R.A., A. Reitz, Y. Li, S. Wagner, and J. Konkler, 2016, Prudhoe Bay reservoir model: making the link between seismic and borehole data to gravity, electrical and EM methods. 86th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Balza, A., Y. Li, and R.A. Krahenbuhl, 2016, Joint analysis of time-lapse gravity and production data for a gas reservoir. 86th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Yin, Q., R.A. Krahenbuhl, Y. Li, S. Wagner, and J. Brady, 2016, Time-lapse gravity data at Prudhoe Bay: New understanding through integration with reservoir simulation models. 86th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Krahenbuhl, R., C. Martinez, Y. Li, and G. Flanagan, 2015: Time-lapse monitoring of CO2 sequestration: an integrated site investigation based on reservoir properties and seismic with borehole and surface gravity data. Geophysics, 80, WA15-WA24. (Special Section, Advances in Time-Lapse)

  • Reitz, A., R. Krahenbuhl, and Y. Li, 2015: Feasibility of time-lapse gravity and gravity gradiometry monitoring for SAGD reservoirs. Geophysics, Geophysics, 80, WA99-WA111. (Special Section, Advances in Time-Lapse)

  • Krahenbuhl, R.A., and Y. Li, 2015: Interpretation of magnetic data in highly magnetic environments with application to the Hawsons Iron Deposit in NSW, Australia. Near Surface Geophysics Asia Pacific Conference (NSGAPC).

  • Krahenbuhl, R.A., and Y. Li, 2015: Robust parametric inversion using adaptive quenched simulated annealing. 85th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Capriotti, J., Y. Li, and R.A. Krahenbuhl, 2015: Joint inversion of gravity and gravity gradient data using a binary formulation. International Workshop on Gravity, Electrical and Magnetic Methods (GEM), Chenghu. Expanded Abstracts

  • Foks, N., R. Krahenbuhl, and Y. Li, 2014: Adaptive sampling of potential-field data: A direct approach to compressive inversion. Geophysics, 79, IM1-IM9.

  • Krahenbuhl, R., A. Reitz, H. Rim, and Y. Li, 2014: Improved recovery of fluid movement through time-lapse borehole vector gravity. 84th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Reitz, A., R.A. Krahenbuhl, Y. Li, and J. Brady, 2014: Feasibility of surface and borehole time-lapse gravity for SAGD monitoring. 84th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Dodds, K., R. Krahenbuhl, A. Reitz, Y. Li, and S. Hovorka, 2013: Evaluating time-lapse borehole gravity for CO2 plume detection at SECARB Cranfield. International Journal of Greenhouse Gas Control (IJGGC), Special Issue: ‘The large-scale CO2 Injection Test at Cranfield, Mississippi, USA”. Vol 18, 421-429

  • Martinez, C., Y. Li, R. Krahenbuhl, and M. Braga, 2013: 3D inversion of airborne gravity gradiometry for iron ore exploration in Brazil. Geophysics, 78, B1-B11

  • Li, Y., S. Devriese, R. Krahenbuhl, and K. Davis, 2013: Enhancement of magnetic data by stable downward continuation for UXO application. IEEE Trans. Geo. Sci & Remote Sens, 51, 3605-3614

  • Krahenbuhl, R. A., C. Martinez, Y. Li, and G. Flanagan , 2013: Integrating reservoir properties and seismic with borehole and surface time-lapse gravity data for monitoring CO2 sequestration: A site investigation. 83nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Reitz, A., R.A. Krahenbuhl, and Y. Li, 2013: Feasibility of time-lapse gravity gradiometry for SAGD monitoring. 83rd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Hovorka, S., R.A. Krahenbuhl, A. Reitz, Y. Li, and K. Dodds, 2012: Evaluating time-lapse borehole gravity for CO2 plume detection at SECARB Cranfield. Intern. Conf. on Greenhouse Gas Technologies (ICGGT), Kyoto, Nov. 2012

  • Krahenbuhl, R. A., Y. Li, and T. Davis, 2012: Time-lapse gravity for reservoir monitoring: Feasibility and potential applications. 22nd Internat. Geophys. Conf. and Exhib., Australian Soc. Expl. Geophys (ASEG), Expanded Abstracts

  • Martinez, C., Y. Li, R.A. Krahenbuhl, and M.A. Braga, 2012: Structurally constrained lithology characterization using magnetic and gravity gradient data over an iron ore formation. 22nd Internat. Geophys. Conf. and Exhib., Australian Soc. Expl. Geophys (ASEG), Expanded Abstracts

  • Krahenbuhl, R.A., Y. Li, and C. Nind, 2012: The benefit of borehole gravity in horizontal monitoring wells for time-lapse applications. 82nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Reitz, A., R.A. Krahenbuhl, Y. Li, and D DiFrancesco, 2012: Feasibility analysis of time-lapse gravity gradiometry for reservoir monitoring. 82nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Foks, L., R.A. Krahenbuhl, and Y. Li, 2012: Adaptive sampling of potential-field data: A direct approach to compressive inversion. 82nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts.

  • Martinez, C, Y. Li, R. Krahenbuhl, and M.A. Braga, 2013: 3D inversion of airborne gravity gradiometry data in mineral exploration: A case study in the Quadrilátero Ferrífero, Brazil. GEOPHYSICS, v78, #1, B1 – B11.

  • Krahenbuhl, R., and Y. Li, 2012: Time-lapse gravity: A numerical demonstration using robust inversion and joint interpretation of 4D surface and borehole data. GEOPHYSICS, v77, #2, G33 – G43.

  • Senseney, C., R. Krahenbuhl, and M. Mooney, 2012: Genetic algorithm to optimize layer parameters in light weight deflectometer backcalculation. Int. J. Geomechanics, ASCE, 2012, doi: 10.1061/(ASCE) GM.1943-5622.0000222.

  • Krahenbuhl, R., Y. Li, and T. Davis, 2011 The Leading Edge, Special Issue (Time-Lapse measurements). Understanding the applications and limitations of time-lapse gravity for reservoir monitoring. The Leading Edge, 30, Issue 9, 1060 – 1068.

  • Krahenbuhl, R., and Li, Y., 2011, 4D gravity modeling: Integrating seismic data with highly constrained gravity inversions for effective reservoir monitoring. 12th International Congress of the Brazilian Geophysical Society (sBGF), Expanded Abstract

  • Martinez, C., Y. Li, R. Krahenbuhl, and M. Braga, 2011, Lithologic characterization using magnetic and gravity gradient data over an iron ore formation in the Quadrilatero Ferrifero, Minas Gerais, Brazil. 12th International Congress of the Brazilian Geophysical Society (sBGF), Expanded Abstract

  • Martinez, C., Y. Li, R. Krahenbuhl, and M. Braga, 2011, Lithologic characterization using magnetic and gravity gradient data over an iron ore formation. 12th International Congress of the Brazilian Geophysical Society (sBGF), Expanded Abstract accepted. 81st Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstract

  • Krahenbuhl, R., and Y. Li, 2011, Regularization, model weighting and solution appraisal in binary inversion for time-lapse gravity monitoring. GEM Beijing 2011: International Workshop on Gravity, Electrical & Magnetic Methods and their Applications. Expanded Abstract

  • Li, Y., and R. Krahenbuhl, 2011, A general framework for 3D interpretation of magnetic data affected by remanence and self-demagnetization. 12th International Congress of the Brazilian Geophysical Society (sBGF), Expanded Abstract

  • Krahenbuhl, R, Y. Li, and T. Davis, 2010, 4D gravity monitoring of fluid movement at Delhi Field, LA: A feasibility study with seismic and well data. 80th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Mitchell, M.A., S.G.R Devriese, R.N. Frary, R. Krahenbuhl, and B.K. Todd, 2010, Archaeological investigations using geophysics at Chimney Rock Great House, Colorado. 80th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Martinez, C., Y. Li, R. Krahenbuhl, and M. Braga, 2010, 3D inversion of airborne gravity gradiometry for iron ore exploration in Brazil. 80th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Krahenbuhl, R., and Li, Y., 2009, Hybrid optimization for lithologic inversion and time-lapse monitoring using a binary formulation, Geophysics, 74, #6, I55-I65 (Accelerated Article)

  • Blum, T., K. van Wijk, L. Liberty, M. Batzle, R. Krahenbuhl, A. Revil, and R. Reynolds, 2009, Characterization of a geothermal system in the Upper Arkansas Valley, CO., 79th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Martinez, C., A. Dean, E. Goggin, R. Krahenbuhl, and B. Todd, 2009, Archaeological investigation of the Court Kiva in Chaco Canyon using geophysical methods, 79th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Krahenbuhl, R., Y. Li and M. Nabighian, Improving UXO detection in magnetic environments through linear feature analysis. UXO/Countermine Forum 2009, Expanded Abstracts

  • Davis, K., Y. Li, R. Krahenbuhl, and M. Nabighian, 2009, Automatic detection of magnetic UXO anomalies in noisy environments. UXO/Countermine/Range Forum 2009, Expanded Abstracts

  • Davis, K., Kass, M.A., Krahenbuhl, R., and Li, Y., 2008, Survey design and model appraisal based on resolution analysis for 4D gravity monitoring. 78th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts, 27, 731

  • Krahenbuhl, R, and Li, Y., 2008, Joint inversion of surface and borehole 4D gravity data for continuous characterization of fluid contact movement. 78th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Krahenbuhl, R., and Li, Y., 2006, Inversion of gravity data using a binary formulation, Geophysical Journal International, 167, #2, 543

  • Krahenbuhl, R., and Li, Y., 2007, Influence of self-demagnetisation effect on data interpretation in strongly magnetic environments. 19th Internat. Conference & Exhibition, Australian Soc. Expl. Geophys., Expanded Abstracts

  • Krahenbuhl, R., and Li, Y., 2007, Influence of self-demagnetisation effect on data interpretation in strongly magnetic environments. 77th Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts

  • Krahenbuhl, R., and Li, Y., 2007, Separation of geologic noise in UXO magnetic data using wavelet transform. UXO/Countermine/Range Forum 2007, Expanded Abstracts

  • Krahenbuhl, R., and Li, Y., 2004, Hybrid optimization for a binary inverse problem. 74nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts ** Best Student Paper presented at conference

  • Krahenbuhl, R., and Hitzman, M., 2004, Geophysical modeling of two willemite deposits, Vazante (Brazil) and Beltana (Australia). 74nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts.

  • Krahenbuhl, R., and Li, Y., 2002, Gravity inversion using a binary formulation. 72nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts.

software contributions

  • BININV3D     Binary inversion of 3D and 4D gravity data for 3D density distribution
  • RAPSfit            Radial power spectral fitting in ensemble analysis of potential field data
  • EllipseFit         Modeling and inversion of gravity data for arbitrary elliptical structure

invited talks / presentations

  • 2020     Agriculturally induced landslides in Peru. Workshop: Applied Geophysics Addressing Top Challenges Facing Humanity.  Society of Exploration Geophysicists, International Conference and Exhibition
  • 2020     Geoscientists Without Borders (GWB). Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP) Conference. Title: Low-cost Geophysical Instrumentation for Groundwater Management in West Africa
  • 2019     Metcalf Archaeology: Geophysical investigations in archaeology
  • 2018     Universidad Nacional de San Agustin de Arequipa (UNSA): Geophysics and sustainable mining
  • 2018     Time-lapse gravity: A versatile method for monitoring dynamic processes. International Symposium on Deep Earth Exploration and Practices (DEEP). Session level invited keynote presentation, speaker Y. Li
  • 2014     Potential Field Interpretation Workshop, Golden, CO: Understanding and interpreting magnetic data affected by self-demagnetization from high-susceptibility sources
  • 2014     Shell Technology Center, Houston, TX:  Advancing reservoir monitoring with time-lapse gravity: New borehole gravity technologies and integration with seismic and reservoir data
  • 2014     Reservoir monitoring by integration of gravity, seismic, and reservoir property data.  SEG Development & Production Forum (D & P Forum), Reservoir Characterization and Monitoring with Advanced Geophysical Technology
  • 2013     Reservoir simulation modeling, gravity, electrical, and EM data for improved monitoring, North Slope, Alaska.  BP Exploration (Alaska) Inc.
  • 2011     Colorado Governor’s Energy Office, Geothermal Working Group (GWG) Workshop: The Path to Colorado’s First Geothermal Test Hole – The integration of geophysical methods for geothermal exploration
  • 2010     Workshop.  Society of Exploration Geophysicists (SEG), 80th Annual International Meeting: Gravity and Magnetic Technologies Applied to Drilling, Development, and Production
  • 2009     Houston Geophysical Society, Potential Fields Group:  Joint inversion of surface and borehole 4D gravity data for continuous characterization of fluid contact movement
  • 2009     BP:  Joint inversion of surface and borehole 4D gravity data for continuous characterization of fluid contact movement
  • 2006     Boise State University, Geosciences Department Seminar Series:  Gravity inversion for salt imaging

collaborators

  • Humanitarian Engineering and Science (HES) Program – Geophysics track. Colorado School of Mines. Co-developer

  • Center for Underground, Rapid Tunneling Team, Colorado School of Mines. DARPA [Underminer]: Advancing Rapid Tactical Tunneling Operations (ARTTO)

  • Universidad Nacional de San Agustin de Arequipa (UNSA): Phase 1 and Phase 2 projects through Center for Mining Sustainability

  • United States Geological Survey (USGS): Charged Wellbore Casing Controlled Source Electromagnetics for Reservoir Imaging and Monitoring

  • Reservoir Characterization Project (RCP), Colorado School of Mines: Integration of RCP seismic and engineering reservoir models for robust 4D potential field modeling

  • Professor Mike Mooney, SmartGeo Director, Colorado School of Mines: Optimization of layer parameters from light weight deflectometer data

  • Planetary Geophysics Lab (PGL), Colorado School of Mines: The crustal structure and formation mechanism of lunar multi-ring basins

  • LockheedMartin: Identifying new applications of next generation gravity gradiometry sensors in monitoring

  • BP Alternative Energy: CO2 plume detection at SECARB Cranfield with time-lapse borehole gravity

  • Shell: Robust parametric inversion of gravity data for ellipsoid targets using adaptive quenched Simulated Annealing (AQSA)

  • Department of Anthropology, CU Boulder; Professor Steve Lekson, Archaeologist: Archaeo-geophysics at Chaco Culture National Historical Park, New Mexico; Archaeo-geophysics at Chimney Rock Great House, Colorado

  • Sky Research, Inc.: Cooperative development and application of new magnetic and time-domain EM technologies for UXO remediation projects

  • ConocoPhillips: Monitoring CO2 sequestration with time-lapse surface and borehole gravity

  • International Reservoir Technologies, Inc.: Cooperative development of 3D and 4D reservoir simulation models for gravity, electrical and electromagnetic methods

  • BP Alaska: Reservoir model development of North Slope; Various non-seismic monitoring studies

  • GEDEX/Anadarko: Imaging base of salt with gravity and gravity gradiometry, SEAM model

  • MicrogLacoste: Optimal well placement for monitoring with next generation borehole gravity meters

  • Crow Canyon Archaeological Center: Archaeological investigation at Indian Camp Ranch, Basketmaker III farmstead

  • Chimney Rock National Monument: Archaeological investigation at Chimney Rock Great House

  • Metcalf Archaeology: Various projects associated with Senior Design

  • Colorado State Archaeologist and Deputy State Historic Preservation, Holly Norton: Projects associated with Senior Design

  • Park County Historic Preservation Advisory Commission: Identification of historic gravesites at Lake George Cemetery

university committees

  • Undergraduate Council (UC), Colorado School of Mines (2019 – present)
  • Technology Committee, Colorado School of Mines (2018 – present; 2010 – 2012)
  • Research Council, Colorado School of Mines (2012 – 2018)
  • Department of Geophysics, Colorado School of Mines
    • Society of Geophysics Graduate Students (SGGS), Advisor, 2018 – present
    • Undergraduate Advisory Committee (UAC), 2010 – present
    • Undergraduate Curriculum Review panel, Summer – Fall 2010
    • Graduate Advisory Committee (GAC), 2002 – 2003

outreach activities

  • Volunteer: History Colorado – Applications of geophysics for historical preservation
  • Volunteer: Jefferson County Public Schools
  • Creator and speaker: Planetarium shows on black holes, Santa Barbara Museum of Natural History
  • Volunteer: Night sky public observations, Santa Barbara Museum of Natural History

professional sicieties & memberships

  • The Institute of Electrical & Electronics Engineers (IEEE)
    • Education Society
    • Learning Technologies
    • Professional Communication Society
    • Geoscience and Remote Sensing Society
  • Society of Exploration Geophysicists (SEG)
    • Near-Surface Geophysics Section
    • Geoscientists Without Borders
  • American Geophysical Union (AGU)
    • Planetary Sciences Member
    • Near Surface Geophysics Member
    • Geodesy Member
    • Marine Geology and Geophysics Member
    • Natural Hazards Member
  • Environmental and Engineering Geophysical Society (EEGS)
  • History Colorado: link to local archaeological projects for Senior Design