Contact Information:

• GMRC: Gravity & Magnetics Research Consortium

• UXO: Unexploded Ordnance group

• 2005, Ph.D., Geophysics, Colorado School of Mines
  - Thesis topic: Binary inversion of gravity data(pdf - 5.8Mb)

• 1997: B.S., Geophysics, University of California, Santa Barbara

• April 2008 – present: Research Assistant Professor, Department of Geophysics, CSM,
  Center for Gravity, Electrical & Magnetic Studies (CGEM)

• Summer 2005 – April 2008: Postdoctoral fellow, Department of Geophysics, CSM,
  Center for Gravity, Electrical & Magnetic Studies (CGEM)

• Summer 2004: Teaching Assistant, GPGN 486: Geophysics Summer Field, CSM

• Fall 2000 – Spring 2005: Research Assistant, Gravity & Magnetics Research Consortium, CSM

• Fall 2000: Teaching Assistant, GPGN 303: Gravity & magnetic exploration methods, CSM

• Sept 1997 – Mar 1998: Geophysics Intern, USGS Hawaiian Volcano Observatory, Geophysics Dept.

• June 1992 – June 1995: Astronomy Intern, Santa Barbara Museum of Natural History, Astronomy Dept.

• 2005– present: Researcher, SERDP Project MM-1414 (awarded 2007 Project of the Year) - Improving detection and discrimination of UXO in magnetic environments

• 2003– present: Center for Gravity, Electrical & Magnetic Studies: Colorado School of Mines
  - Joint inversion of surface & borehole 4D gravity data for continuous characterization of fluid contact movement
  - Influence of self-demagnetisation effect on data interpretation in strongly magnetic environments
  - Separation of geologic noise in UXO magnetic data using wavelet transform
  - Detection of UXO in strongly magnetic environments by extended Euler deconvolution
  - Geophysical modeling of willemite deposits
  - Archaeological geophysics at Ludlow massacre site, Colorado
  - Archaeological geophysics at Chaco Culture National Historical Park

• 1999 – 2005: Gravity & Magnetics Research Consortium: Colorado School of Mines
  - Binary inversion of gravity data
  - Hybrid optimization for a binary inverse problem

• Lithologic inversion of geophysical data for energy exploration

• Control Source Audio-frequency Magneto Telluric (CSAMT) and time-lapse gravity monitoring for aquifer storage at Layden Mine, CO

• Experimental design of new electrical survey (DC/IP) array configurations

• Joint inversion of DC resistivity and electromagnetic (EM) data for energy exploration

• Unexploded Ordnance (UXO) research

• Archaeological geophysics: Electrical (DC/IP), Magnetic, and Electromagnetic studies at Ludlow massacre site, Colorado

• Geophysical modeling of willemite (zinc silicate) deposits

• Summer 2008: GPGN 486, Geophysical Field Camp, CSM
  Co-instructor

• Fall 2007 - present: GPGN 303, Gravity & magnetic exploration methods, CSM

• Spring 2007: GEGN317, Geophysics module, Geology Field Methods, CSM

• Spring 2006: GPGN 498/598, Geophysical Methods for UXO detection & discrimination, CSM
  Co-instructor

• Spring 2006: GPGN 438, Senior Design, Kilauea Volcano Hawaii, CSM
  Advisor and co-instructor

• Fall 2000: GPGN 303, Gravity & magnetic exploration methods, CSM
  Taught a section of course in fulfillment of requirement for Ph.D. program

• Nov 1994 – Oct 1996: Planetarium show creator, Santa Barbara Museum of Natural History
  Wrote, produced & presented planetarium shows on black holes

• Aug 1994 – Jan 1995: Astronomy guest lecturer, Santa Barbara City College
  Taught in planetarium & observatory about night sky and telescope designs

• 2008-2010: Principal Investigator, SERDP Project MM-1638: Advanced UXO detection and discrimination using magnetic data based on extended Euler deconvolution and shape identification through multipole moments
  Awarded for Spring 2008 through Spring 2010, $457k

• 2008-2009: Co-PI, SERDP Project MM-1640: Enhancement of Transient Electro-Magnetic (TEM) data and noise characterization by principal component analysis (PCA)
  Awarded for Spring 2008 through Spring 2009, $98k

• 2008-2009: Co-PI, SERDP Project MM-1642: Enhancement of magnetic data by stable downward continuation for UXO application
  Awarded for Spring 2008 through Spring 2009, $72.3k

• Technology Fee Proposal Awards, Colorado School of Mine
  (For acquisition of equipment for teaching and research in the Department of Geophysics)
  - Fall 2008: EM-34 Ground Conductivity Meter by Geonics, Ltd. $29k
  - Spring 2007: Differential GPS System by Trimble (co-author) $19.5k
  - Fall 2006: Geode 24-Chanel In-Field Seismograph by Geometrics, Inc. $16.9k
  - Spring 2006: EM-63 Full Transient ElectroMagnetic Sounder, Geonics, Ltd. $26.8k
  - Fall 2005: SuperSting 28 Channel Resistivity/IP Meter by AGI, Inc. $18k
  - GSMP-40 Potassium Magnetic Gradiometer by GEM Systems $19.3k

• 2007: Project of the Year. Co-performer - SERDP Project MM-1414: Improving detection and discrimination of UXO in magnetic environments

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

• 2004: Ranked in top 25 papers presented at the 74nd Ann.Internat. Mtg, Soc. Expl. Geophys.
  Krahenbuhl, R., and Li, Y., 2004, Hybrid optimization for a binary inverse problem

• 2002: SEG Annual Meeting Grant Award, for attendance and presentation of:
  Krahenbuhl, R., and Li, Y., 2002, Gravity inversion using a binary formulation $1000

• 2002 – 2004 Academic Years: SEG Chevron Scholarship $2000/yr

• 2001 – 2002 Academic Year: SEG Lucien LaCoste Scholarship $10,000/yr

• 2000 – 2001 Academic Year: Colorado Graduate Fellowship, $14,000

• Krahenbuhl, R., and Li, Y., 2007, Influence of self-demagnetization effect on data interpretation in strongly magnetic environments,19th International Geophysical Conference and Exhibition, Perth, WA, Extended Abstracts

• Krahenbuhl, R., and Li, Y., 2007, Influence of self-demagnetization effect on data interpretation in strongly magnetic environments, 76th 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 Forum 2007, Expanded Abstracts

• Krahenbuhl, R., and Li, Y., 2006, Inversion of gravity data using a binary formulation, Geophysical Journal International, Vol. 167, Issue 2, pgs 543-556.

• Krahenbuhl, R., 2005, Binary inversion of gravity data for salt imaging, Ph.D. thesis, Colorado School of Mines (pdf - 5.8Mb)

• Krahenbuhl, R., and Li, Y., 2004, Hybrid optimization for a binary inverse problem
  74nd Ann.Internat. Mtg, Soc. Expl. Geophys., Expanded Abstracts
  Ranked in the top 25 papers presented at the conference & Best Student paper

• 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.

• Krahenbuhl, R., and Li, Y., Hybrid optimization for binary problems in lithologic inversion and time-lapse monitoring
  Current manuscript for journal publication: Geophysics

• Krahenbuhl, R., and Hitzman, M., Geophysical modeling of two willemite deposits, Vazante (Brazil) and Beltana (Australia)
  Current manuscript for journal publication: Australian Society of Exploration Geophysicists (ASEG)

• Society of Exploration Geophysicists (SEG)

• Australian Society of Exploration Geophysicists (ASEG)

• Environmental and Engineering Geophysical Society (EEGS)

• Society of Geophysics Graduate Students, Colorado School of Mines (SGGS)
  2002 – 2003 academic year: President
  2001 – 2002 academic year: Treasurer