Richard A. Krahenbuhl, PhD

Director: Humanitarian Engineering and Science, Graduate Program
Associate Research Professor: Department of Geophysics

MINES Affiliations

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

TAUGHT AT MINES

Applied Geophysics + Field Labs
Drone Geophysics
Geophysics Field Camp
Geophysical Data Analysis
Senior Design

TAUGHT AT MINES

Geophysical Data Integration (GPGN 599)
Gravity & Magnetic Methods
Geophysical Field Methods
Geophysics for UXO Detection & Discrimination
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 Center for Mining Sustainability, Phase II: Unraveling the nexus of geology, groundwater, agriculture, and landslides in southern Peru
2019 – 2020 $1.12M PI Center for Mining Sustainability, Phase I: Geophysics, Geology, Hydrological Modeling, Photogrammetry, & water filtration – Characterizing the agricultural development & landslide activity at Majes, southern Peru
2018 – 2020 $8M Co-PI DARPA [Underminer]: Advanced Rapid Tactical Tunneling Operations – Task: Magnetic Sensing
2018 – 2020 $99K Co-PI Geoscientists Without Borders: Building 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 in hydrocarbon exploration
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 and electromagnetics
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:

Geo-Drone Platform and sensor collection
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 Proceedings

Hanna E. Flamme; Richard A. Krahenbuhl (PI); Yaoguo Li; Brandon Dugan; Jeffrey Shragge; Andrew Graber; Dana Sirota; Gavin Wilson; Edgard Gonzales; Javier Ticona; Armando Minaya, 2021: Integrated geophysical investigation for understanding agriculturally induced landslides in southern Peru. Submitted for publication in Environmental Earth Sciences
Dana Sirota, Jeffrey Shragge, Richard Krahenbuhl (Co-PI), Andrei Swidinsky, Nicaise Yalo, and John Bradford, 2021: Development and Validation of a Low-cost DC Resistivity Meter for Humanitarian Geophysics Applications. Accepted. Geophysics – Special Section: Humanitarian Geoscience
Xiaolu Wei, Pablo Garcia-Chevesich, Francisco Alejo, Vilma García, Gisella Martínez, Fariborz Daneshvar, Laura C. Bowling, Edgard Gonzáles, Richard Krahenbuhl (PI), and John E. McCray, 2021: Hydrologic Analysis of an Intensively Irrigated Area in Southern Peru Using a Crop-Field Scale Framework. Water, 2021, 13(3), 318; doi:10.3390/w13030318
Pablo Garcia-Chevesich, Xiaolu Wei, Juana Ticona, Gisella Martínez, Julia Zea, Vilma García, Francisco Alejo, Yao Zhang, Hanna Flamme, Andrew Graber, Paul Santi, John McCray, Edgard Gonzáles and Richard Krahenbuhl (PI): The Impact of Agricultural Irrigation on Landslide Triggering: A Review from Chinese, English, and Spanish Literature. Water, 2021 13(1), 10; https://doi.org/10.3390/w13010010
Graber, A. P. Santi, H. Flamme, and R. Krahenbuhl (PI), 2020, Finite Element Modeling to Constrain Unknown Groundwater Conditions for Large Landslides in the Siguas River Valley, Peru. The Geological Society of America, Annual Meeting
Flamme, H., D. Sirota, R. Krahenbuhl (PI), 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 (PI), 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 (PI), 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 (PI), 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 (PI), 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 (Co-PI), 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. (PI), 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. (C0-PI), 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
R. Krahenbuhl (PI), 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.
R. Krahenbuhl (PI)., 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 (PI), 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
R. Krahenbuhl (PI), 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. Krahenbuhl (PI), 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
R. Krahenbuhl (PI), 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 (PI), 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)
R. Krahenbuhl (PI), 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).
R. Krahenbuhl (PI), 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.
R. Krahenbuhl (PI), 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. Krahenbuhl (PI), 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
R. Krahenbuhl (PI), 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
R. Krahenbuhl (PI), 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
R. Krahenbuhl (PI), 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. Krahenbuhl (PI), 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.
R. Krahenbuhl (PI), 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.
R. Krahenbuhl (PI), 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.
R. Krahenbuhl (PI), 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
R. Krahenbuhl (PI), 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
R. Krahenbuhl (PI), 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 (PI), 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
R. Krahenbuhl (PI), 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
R. Krahenbuhl (PI), 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

2021 Geoscientists Without Borders – Keynote speaker. Symposium on the Application of Geophysics to Engineering and Environmental Problems: Low-cost Geophysical Instruments for Groundwater Management in West Africa
2021 MINES Integrated CCUS Initiative, 2021 Expo. The evolution and current state of time-lapse gravity for carbon storage monitoring
2020 Agriculturally induced landslides in Peru. Workshop: Applied Geophysics Addressing Top Challenges Facing Humanity. Society of Exploration Geophysicists, International Conference and Exhibition
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 (Co-Author)
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), 80^th 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