Professional Appointments

University of Bergen, Department of Geoscience, Norway, Associate Professor, 2010-

Schlumberger, Oslo Technology Centre, Norway, Geophysical Advisor, 2007-2009

Schlumberger Cambridge Research, UK, Senior Research Scientist, 2000-2007

University of California, Berkeley, Department of Earth and Planetary Sciences, USA, Postdoc, 1997-2000

 

University of Cambridge, Department of Earth Science, UK, Visiting Scientist, 2019

University of Washington, Applied Physics Lab, Seattle, USA, Visiting Scientist, 2015

University of Kiel, Institute for Geoscience, Kiel, Germany, Visiting Scientist, 2015

 

Education

Princeton University, Department of Geosciences, USA, PhD, 1997

Utrecht University, Department of Geosciences, the Netherlands, BSc, 1991

 

Awards

Excellent Teaching Practitioner, University of Bergen, 2021

Invited speaker, International Conference on Underwater Acoustics, 2021

Invited speaker, American Geophysical Union, Fall Meeting, 2016

‘Best Research Project with Commercial Potential’ awarded by BTO/Sparebanken Vest, 2010

UC Berkeley, Miller Fellow, Miller Institute for Basic Research in Science, 1997-1999

 

Main research areas

• Earthquake seismology
• Environmental geophysics
• Geothermal energy
• Global seismology
• Ocean acoustics
• Seismic exploration

Courses

Bachelor level:

• Introduction to Geophysics (GEOV111), 2012-2014

• Solid Earth Physics (GEOV112), 2010-present

• Seismic Acquisition and Data Processing (GEOV113), 2012-2013

Bachelor/Master level:

• Computational Methods in Geophysics (GEOV219), 2011-2020

• Global and Applied Geophysics (GEOV265), 2021-

• Data Analysis and Inversion in Geophysics (GEOV277), 2018-2019

Master level:

• Writing and Presentation Skills for Geoscience Students (GEOV300), 2015-2016

 

Awards

Excellent Teaching Practitioner, University of Bergen, 2021

Invited speaker, Session on Geoscience Teaching, AGU, 2017

 

Master Students

19. Elastic Imaging and Full Waveform Inversion for Carbon Sequestration, Tora Haugen Myklebust, M

18. Efficient Ray Based Modelling Techniques for Geothermal Reservoir Characterization, A Case Study of The Geysers Geothermal Field - Malin Larsen Nordstad, M

17. Efficient Modeling for Long Range Ocean Acoustics - Kristoffer Igland, M

16. Relocating Earthquakes using Seismic Networks on Small Islands: Case Studies from Heimaey (Iceland) and Jan Mayen (Norway) - Robin André Rørstadbotnen, 2019

15. Characterization of a Geothermal Field Using Multiscale Travel Time Tomography – Study of the Miravalles Geothermal Field in Costa Rica - Regine Johansen, M 2019

14. Estimation of Landscape History Using Multiple In Situ Cosmogenic Isotopes; Quantification of Erosion Rates in Rendalssølen in Norway - Audun Hitland, 2019

13. AVO Inversion Using Data Assimilation - Thomas de Jonge, M 2019

12. Comparison of a Classical PSHA and a Rupture Forecast for California - Helga Indrøy, 2018

11. Non-linear AVO Inversion - Anja Tveit, M 2018

10. Double-Difference Relocation and Empirical Green Function Analysis of Storfjorden Earthquakes - Norunn Tjåland, 2017

9. Frequency Selection Strategies for Full Waveform Inversion - Ildus Islamgulov, 2017

8. Anisotropic Properties of a Mid-Lithospheric Discontinuity in Eastern North America –  Mari Farestveit, 2017

7. The Cascadia Subduction zone: Kinky or not? An Implementation of a 2D Background Velocity Model in Teleseismic Scattered-wave Inversion - Maren Kjos Veim, 2017

6. Analysis of Magma Chamber Activity at Yellowstone from 2010 to 2017 – Marie Lien, M 2017

5. Seismic Modeling for Geothermal Reservoir Characterization - Annie Jerkins, M 2016

4. Seismo-Tectonics of the Alborz Mountains (Iran) from Local Earthquake Data – Sara Rezaei, 2015

3. Exploring the Seismicity of the Gakkel Ridge from Arctic Sea Ice - Gaute Hope, M 2013

2. The Application of Full Waveform Inversion to Carbonate Rocks – Njål Greiner, M 2013

1. Ray-Born Modeling and Waveform Inversion - Hans Christian Tengesdal, M 2013

(M stands for 'main supervisor')

 

Courses in University Pedagogy

Collegial Learning and Teaching in STEM Education, 2016-2017

Hot Moments in Teaching and Learning, 2013

Course Evaluations, 2013

Introduction to University Pedagogy, 2012-2013

 

Publications on Teaching

9. Keers, H., E. Stordahl, B. Nyberg, K. Mair, Geoscience Education and Technology – Effect of the Lockdown, Nordic Geoscience Winter Meeting, Iceland, 2022.

8. Keers, H., I. Christensen, S. Balevik, Teaching and Assessment at the Faculty of Mathematics and Natural Science, Faculty Teaching Seminar, Flesland, 2022.

7. Keers, H., E. Stordahl, B. Nyberg, K. Mair, Geoscience Education and Technology – Effects of the Lockdown, iEarth Digital Learning Forum, 2021.

6. Keers, H., Research Based Teaching - Teaching using Research or Learning to do Research? Special Issue on Innovation in Teaching of The Journal for Research and Practice in College Education, 3, 2, 94-97, 2018.

5. Nyberg, B., H. Keers, Technology and Teaching Methods in Geoscience Education - Results from a Worldwide Survey, ISSOTL conference, Bergen, 2018.

4. Keers, H., J. Grytnes, A. Salvanes, R. Waagbø, How Technology Motivates and Enhances Students’ Learning, EuroSOTL conference, University of Lund, 2017.

3. Keers, H., S. Rondenay, Y. Harlap, I. Nordmo, Active Learning, Digital Teaching and Assessment of University Science Courses, SOTL Conference, University of Bergen, 2017.

2. Keers, H., S. Rondenay, Y. Harlap, I. Nordmo, Teaching Computational Geophysics Classes Using Active Learning Techniques (Invited), presentation at AGU fall meeting, San Francisco, 2016.

1. Keers, H., S. Rondenay, Y. Harlap, I. Nordmo, Resources for Computational Geophysics Courses, EOS, 95, 37, 335-336, 2014.

Academic article

• Stampa, J.; Eckel, F.; Keers, Henk et al. (2024). Automated measurement of teleseismic P-, SH- and SV-wave arrival times using autoregressive prediction and the instantaneous phase of multicomponent waveforms. (external link)
• Nyberg, Björn Johan Emil Burr; Keers, Henk; Næsheim, Sigrid et al. (2023). SEDucate: Sedimentology Log Exercises for an Active Learning Environment, DOI: 10.57035/journals/sdk.2023.e11.1014, Sedimentologika. (external link)
• Galtung, Kristoffer Tesdal; Keers, Henk; Sarajærvi, Martin et al. (2021). Efficient Modeling for Ocean Acoustics. (external link)
• Newrkla, Katharina; Shiddiqi, Hasbi Ash; Jerkins, Annie et al. (2019). Implications of 3D Seismic Raytracing on Focal Mechanism Determination. (external link)
• Sarajaervi, Martin; Keers, Henk (2019). Ray-based modeling and imaging in viscoelastic media using graphics processing units. (external link)
• Demuth, Andrea; Ottemöller, Lars; Keers, Henk (2018). QLg wave tomography beneath Norway. (external link)
• Sarajaervi, Martin; Keers, Henk (2018). Computation of ray-Born seismograms using isochrons. (external link)
• Moghaddam, Peyman Poor; Khajavi, Reza; Keers, Henk (2018). Travel time computations using a compact eikonal equation for vertical transverse isotropic media. (external link)
• Minakov, Alexander; Keers, Henk; Kolyukhin, Dmitriy et al. (2017). Acoustic waveform inversion for ocean turbulence. (external link)
• Demuth, Andrea; Ottemöller, Lars; Keers, Henk (2016). Ambient noise levels and detection threshold in Norway. (external link)
• Cristiano, Luigia; Meier, Thomas; Krüger, Frank et al. (2016). Teleseismic P-wave polarization analysis at the Gräfenberg array. (external link)
• Mikhalevsky, Peter N.; Sagen, Hanne; Worcester, Peter Francis et al. (2015). Multipurpose Acoustic Networks in the Integrated Arctic Ocean Observing System. (external link)
• Atakan, Kuvvet; Bjerrum, Louise Wedderkopp; Bungum, Hilmar et al. (2015). The European plate observing system and the Arctic. (external link)
• Moghaddam, Peyman Poor; Keers, Henk; Herrmann, Felix J. et al. (2013). A new optimization approach for source-encoding full-waveform inversion. (external link)
• Minakov, Alexander; Mjelde, Rolf; Faleide, Jan Inge et al. (2012). Mafic intrusions east of Svalbard imaged by active-source seismic tomography. (external link)
• Libak, Audun; Eide, Christian Haug; Mjelde, Rolf et al. (2012). From pull-apart basins to ultraslow spreading: Results from the western Barents Sea Margin. (external link)
• Moghaddam, Peyman Poor; Libak, Audun; Keers, Henk et al. (2012). Efficient and accurate modeling of ocean bottom seismometer data using reciprocity. (external link)
• Libak, Audun; Mjelde, Rolf; Keers, Henk et al. (2012). An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust. (external link)

Academic lecture

• Keers, Henk; Meier, Thomas (2023). Modeling of body waves for regional seismology. (external link)
• Vedå, Lisbeth Johnsen; Linge, Henriette; Keers, Henk et al. (2023). Modelling Cosmogenic Nuclide Inventories for Different Landslide Geometries: A Study of the Hølen Rock Avalanche. (external link)
• Myklebust, Tora; Keers, Henk (2022). Elastic isotropic modeling and full waveform inversion for regional seismology. (external link)
• Nyberg, Björn Johan Emil Burr; Næsheim, Sigrid; Keers, Henk (2022). SEDucate plugin for sedimentology course curriculums . (external link)
• Keers, Henk; Stordahl, Elise; Nyberg, Björn Johan Emil Burr et al. (2022). Geoscience Education and Technology - Effects of the Lockdown. (external link)
• Keers, Henk; Galtung, Kristoffer Tesdal; Sarajærvi, Martin et al. (2021). Efficient Modeling Methods for Long Range Ocean Acoustics. (external link)
• Galtung, Kristoffer Tesdal; Keers, Henk; Sarajærvi, Martin et al. (2021). Detection of Temperature Variations in the Ocean using Long Range Acoustics. (external link)
• Keers, Henk; Stordahl, Elise; Nyberg, Björn Johan Emil Burr et al. (2021). Geoscience Education and Technology - Results of the Lockdown. (external link)
• de Jonge, Thomas; Alerini, Mathias; Keers, Henk (2021). Stochastic AVO Inversion: Sensitivity Analysis and Application to the Volve Field. (external link)
• Shidiqqi, A.; Newrkla, K.; Jerkins, Annie et al. (2019). Implications of 3D teleseismic ray-tracing on the determination of focal mechanisms. (external link)
• Keers, Henk; Nyberg, Björn Johan Emil Burr (2018). Technology and Teaching Methods in Geoscience Education - Results from a Worldwide Survey. (external link)
• Sarajærvi, Martin; Keers, Henk (2018). Efficient Modeling and Imaging in Viscoelastic Media Using GPUs. (external link)
• Keers, Henk; Rondenay, Stephane; Harlap, Yael et al. (2017). Active Learning, Digital Teaching and Assessment of University Science Courses.. (external link)
• Demuth, Andrea; Ottemöller, Lars; Keers, Henk (2016). Lg wave attenuation tomography for Norway. (external link)
• Keers, Henk (2015). Full waveform inversion for ocean acoustics and seismic exploration. (external link)
• Keers, Henk (2015). Full waveform inversion using ray-Born modeling. (external link)
• Demuth, Andrea; Ottemöller, Lars; Keers, Henk (2014). Detection limits and ambient noise levels of the Norwegian National Seismic Network. (external link)
• Hope, Gaute; Kristoffersen, Yngve; Ottemöller, Lars et al. (2013). Studying microseismicity of the Gakkel ridge from drifting sea ice. (external link)
• Raeesi, Mohammad; Atakan, Kuvvet; Keers, Henk (2013). Revisiting the slip distribution of the May 1960 (Mw 9.5) Chile. (external link)
• Hope, Gaute; Kristoffersen, Yngve; Ottemoller, Lars et al. (2012). Experience from studying microseismicity from drifting sea ice at the Gakkel ridge. (external link)
• Jakobsen, Morten; Keers, Henk (2010). Fast modelling of time-lapse seismic data using integral equation methods.. (external link)
• Jakobsen, Morten; Keers, Henk (2010). T-matrix Approach to Seismic Modeling in the Acoustic Approximation.. (external link)
• Minakov, Alexander; Mjelde, Rolf; Faleide, Jan Inge et al. (2010). Northern Barents Sea Evolution Linked to the Arctic Ocean. (external link)

Lecture

• Keers, Henk; Nyberg, Björn Johan Emil Burr; Mair, Karen et al. (2023). The Impact of the COVID-19 Pandemic on University Education. (external link)
• Keers, Henk (2023). Inquiry-Based Problems for STEM education. (external link)
• Keers, Henk; Christensen, Ingrid; Balevik, Stine Beate (2022). Teaching and Assessment at the Faculty of Mathematics and Natural Science. (external link)
• Keers, Henk; Rondenay, Stéphane; Harlap, Yael et al. (2016). Teaching Computational Geophysics Classes using Active Learning Techniques. (external link)

Masters thesis

• Keers, Henk (2023). Elastic Seismic Imaging and Probabilistic AVO Inversion; Application to CO2 Storage at Sleipner. (external link)
• Keers, Henk (2023). Full Waveform Inversion and Multi-Diagonal Inversion for Monitoring of CO2 Storage at Sleipner. (external link)
• Keers, Henk (2023). Fault Zone Characterization and Monitoring of CO2 Storage using Full Waveform Inversion. (external link)
• Keers, Henk (2022). Master thesis - Elastic Imaging and Full Waveform Inversion for Carbon Sequestration. (external link)
• Keers, Henk (2022). Master Thesis - Efficient Ray Based Modelling Techniques for Geothermal Reservoir Characterization – A Case Study of The Geysers Geothermal Field. (external link)
• Keers, Henk (2021). Master thesis - Efficient Modeling for Long Range Ocean Acoustics . (external link)
• Keers, Henk (2019). Master thesis - Characterization of a Geothermal Field Using Multiscale Travel Time Tomography – Study of the Miravalles Geothermal Field in Costa Rica. (external link)
• Keers, Henk (2019). Master thesis - Relocating Earthquakes using Seismic Networks on Small Islands: Case Studies from Heimaey (Iceland) and Jan Mayen (Norway). (external link)
• Keers, Henk (2019). Master thesis - Estimation of Landscape History Using Multiple In Situ Cosmogenic Isotopes; Quantification of Erosion Rates in Rendalssølen in Norway. (external link)
• Keers, Henk (2019). Master thesis - AVO Inversion Using Data Assimilation. (external link)
• Keers, Henk (2018). Master Thesis - Comparison of a Classical PSHA and a Rupture Forecast for California. (external link)
• Keers, Henk (2018). Master thesis - Non-linear AVO Inversion. (external link)
• Keers, Henk (2017). Frequency Selection Strategies for Full Waveform Inversion. (external link)
• Keers, Henk (2017). Master thesis - Anisotropic Properties of a Mid-Lithospheric Discontinuity in Eastern North America . (external link)
• Keers, Henk (2017). Master thesis - The Cascadia Subduction zone: Kinky or not? An Implementation of a 2D Background Velocity Model in Teleseismic Scattered-wave Inversion. (external link)
• Keers, Henk (2017). Master thesis - Double-Difference Relocation and Empirical Green Function Analysis of Storfjorden Earthquakes. (external link)
• Keers, Henk (2017). Master thesis - Analysis of Magma Chamber Activity at Yellowstone from 2010 to 2017. (external link)
• Keers, Henk (2016). Master thesis - Seismic Modeling for Geothermal Reservoir Characterization. (external link)
• Keers, Henk (2015). Master thesis - Seismo-Tectonics of the Alborz Mountains (Iran) from Local Earthquake Data. (external link)
• Keers, Henk (2013). Master thesis - Exploring the Seismicity of the Gakkel Ridge from Arctic Sea Ice. (external link)
• Keers, Henk (2013). Master thesis - Ray-Born Modeling and Waveform Inversion. (external link)
• Keers, Henk (2013). Master thesis - The Application of Full Waveform Inversion to Carbonate Rocks. (external link)

Doctoral dissertation

• Keers, Henk (2020). PhD Thesis - Modeling, Imaging and Full Waveform Inversion of Viscoelastic Waves. (external link)
• Keers, Henk (2018). PhD Thesis - Ambient Noise Levels, Q-Lg Tomography and Earthquake Source Parameters in Norway . (external link)
• Keers, Henk (2008). PhD thesis - Estimation of Unsaturated Flow Parameters by Inverse Flow Modeling and GPR Tomography. (external link)

Report

• Keers, Henk (2018). Research Based Teaching - Teaching using Research or Learning to do Research?. (external link)

Academic anthology/Conference proceedings

• Keers, Henk; Salvanes, Anne Gro Vea; Grytnes, John-Arvid et al. (2017). How technologies motivate and enhance student learning. (external link)

Poster

• Minakov, Alexander; Kolyukhin, Dmitriy; Keers, Henk (2015). Imaging of 3D Ocean Turbulence Microstructure Using Low Frequency Acoustic Waves. (external link)
• Cristiano, Luigia; Minakov, Alexander; Keers, Henk et al. (2014). Observation and modelling of P-wave polarization for teleseismic events. (external link)
• Minakov, Alexander; Tengesdal, Hans Christian; Keers, Henk (2013). Ray-Born modeling in acoustic and elastic media. (external link)
• Libak, Audun; Moghaddam, Peyman Poor; Minakov, Alexander et al. (2013). Seismic waveform inversion and imaging of deepwater glacial sedimentary fans in the northern Norwegian-Greenland Sea. (external link)
• Libak, Audun; Eide, Christian Haug; Mjelde, Rolf et al. (2011). Strukturen til jordskorpen vest for Bjørnøya. (external link)
• Jakobsen, Morten; Keers, Henk; Ruud, Bent Ole et al. (2010). Waveform inversion of 4D seismic data using the Born approximation in the frequency domain. (external link)

Academic literature review

• Keers, Henk; Rondenay, Stéphane; Harlap, Yael et al. (2014). Resources for computational geophysics courses. (external link)

Abstract

• Tengesdal, Hans Christian; Minakov, Alexander; Keers, Henk (2014). Hybrid ray-Born and finite difference full waveform inversion. (external link)

Other product

• Keers, Henk; Melbø-Strommen, Aslaug; Hopperstad, Jon Fredrik et al. (2013). Acquiring near-zero offset survey data, Patent WO2009/148900, US patent 8467264,. (external link)
• Keers, Henk (2012). Determining Positioning of Survey Equipment Using a Model, US patent 8094513 (with 4 co-inventors). (external link)
• Keers, Henk; Vongtragool, S.; Welker, K. et al. (2012). Determining Positioning of Survey Equipment Using a Model, US patent 8094513. (external link)
• Keers, Henk (2011). Geophysical Signal Processing, US patent 0128817. (external link)
• Keers, Henk; Kitchenside, P; Nichols, D. et al. (2011). Migration velocity analysis using seismic data, US patent 0085413. (external link)
• Tustin, G.; Meeten, G.; Jones, T. et al. (2010). Seismic Data Acquisition Assembly, Patent WO/2010/021880, US/2010/00039890. (external link)
• Kitchenside, P; Busanello, G.; Keers, Henk (2010). Imaging with Vector Measurements, Patent WO/2010/091115, US/2010/0202250. (external link)
• Keers, Henk; Childs, P. (2010). Using Waveform Inversion to Determine Properties of a Subsurface Medium, Patent WO/2010/0065778, US patent 0142316. (external link)

See a complete overview of publications in Cristin.

Scientific Papers (Peer Reviewed)

30. de Jonge, T., M. Alerini, H. Keers, AVO Inversion using Data Assimilation: Sensitivity Analysis and Application to the Volve Reservoir (submitted)

29. Galtung, K., H. Keers, M. Sarajærvi, G. Hope, Efficient Modeling for Ocean Acoustics, Proceedings of Meetings on Acoustics, 44, 022002, 1-15, 2021.

28. Newrkla, K, H. Ash Shidiqqi, A. Jerkins, L. Ottemöller, H. Keers, Implications of 3D Seismic Raytracing on Focal Mechanism Determination, Bulletin Seismological Society of America, 109, 6, 2746-2754, 2019.

27. Sarajærvi, M., H. Keers, Ray-based Modelling and Imaging in Viscoelastic Media Using Graphics Processing Units, Geophysics, 84, 5, 1-12, 2019.

26. Demuth, A., L. Ottemöller, H. Keers. Q_Lg wave Tomography beneath Norway, Journal of Seismology, doi/10.1007/s10950-018-9798-x, 1-14, 2018.

25. Moghaddam, P., R. Khajavi and H. Keers, Travel time computations using a compact eikonal equation for vertical transverse isotropic media, Geophysical Prospecting, doi: 10.1111/1365-2478.12636, 2018.

24. Sarajærvi, M., H. Keers, Computation of ray-Born seismograms using isochrons, Geophysics, 83, T245-256, 2018.

23. Minakov, A., H. Keers, D. Kolyukhin, H. Tengesdal, Acoustic waveform inversion for ocean turbulence, Journal of Physical Oceanography, 47, 1473-1491, 2017

22. Cristiano L., T. Meier, F. Krüger, H. Keers, C. Weidle, Teleseismic P-wave polarization analysis at the Gräfenberg array, Geophysical Journal International, 207 (3), 1456-1471, 2016.

21. Demuth, A., L. Ottemöller, H. Keers, Ambient noise levels and detection threshold in Norway, Journal of Seismology, DOI 10.1007/s10950-016-9566-8, 2016.

20. Atakan, K., Bjerrum, L., Bungum, H., Dehls, J., Kaynia, A., Keers, H., Kierulf, H., Kværna, T., Langeland, T., Lindholm, C., Maupin, V., Ottemöller, L., Sørensen, M., Yuen, M., The European Plate, Observing System and the Arctic, Arctic, 68, 1-7, 2015.

19. Mikhalevsky, P., Sagen, H., Worcester, P., Baggeroer, A., Orcutt, J., Moore, S., Lee, C.; Vigness-Raposa, K., Freitag, L., Arrott, M., Atakan, K., Beszczynska-Möller, A., Duda, T., Dushaw, B., Gascard, J., Gavrilov, A., Keers, H., Morozov, A., Munk, W., Rixen, M., Sandven, S., Skarsoulis, E., Stafford, K., Vernon, F., Yuen, M., Multipurpose Acoustic Networks in the Integrated Arctic Ocean Observing System, Arctic, 68, 11-27, 2015.

18. Moghaddam, P., H. Keers, F. Herrmann, W. Mulder, A new optimization approach for source-encoding full-waveform inversion, Geophysics, 78, R125-R132, 2013.

17. Moghaddam, P., A. Libak, H. Keers, R. Mjelde, Efficient and accurate modelling of ocean bottom seismometer data using reciprocity, Geophysics, 77, T211-T220, 2012.

16. Libak, A., R. Mjelde, H. Keers, J. I. Faleide, Y. Murai, An integrated geophysical study of Vestbakken Volcanic Province, Western Barents Sea, and adjacent oceanic crust, Marine Geophysical Research, 33, 185-207, 2012.

15. Minakov, A, R. Mjelde, J. I. Faleide, E. Flueh, A. Dannowski, H. Keers, Mafic Intrusions East of Svalbard Imaged by Active-Source Seismic Tomography, Tectonophysics, 518- 521, 106-118, dx.doi.org/10.1016/j.bbr.2011.03.031, 2012.

14. Libak, A., C. H. Eide, R. Mjelde, H. Keers, E. R. Flueh, From pull-apart basins to ultraslow spreading: Results from the western Barents Sea Margin, Tectonophysics, 518-521, 44- 61, doi:10.1016/j.tecto.2011.09.020, 2011.

13. Farmani, M. B., N.-O. Kitterød, H. Keers, Estimation of Unsaturated Flow Parameters Using GPR Tomography and Groundwater Table Data, Vadose Zone Journal, 7, 1-14, doi10.2136/vzj 2007-0169, 2008.

12. Farmani, M. B., N.-O Kitterød, H. Keers, Inverse Modeling of Unsaturated Flow Parameters Using Dynamic Geological Structure Conditioned by GPR Tomography, Water Resources Research, 44, W08401, doi:10.129/2007WR006251, 2008.

11. Vasco, D. W., H. Keers, J. Khazanehdari, A. Cooke, Seismic Imaging of Reservoir Flow Properties: Resolving Water Influx and Reservoir Permeability, Geophysics, 73, O1-O13, 2008.

10. Farmani, M. B., H. Keers, N.-O. Kitterød, Time-Lapse GPR Tomography of Unsaturated Water Flow in an Ice-Contact Delta, Vadose Zone Journal, 6, 46-57, 2007.

9. Keers, H., D. Vasco, L. Johnson, Determination of Porosity and Saturation Using Seismic Waveform Inversion, Stud. Geophys. Ged., 51, 119-140, 2007.

8. Amodei, D., H. Keers, D. Vasco, L. Johnson, Computation of Uniform Waveforms Using Complex Rays, Physical Review E, 73, 036704 (1-14), 2006.

7. Vasco, D., H. Keers, J. Peterson, E. Majer, Zeroth Order Asymptotics: Waveform Inversion of the Lowest Degree, Geophysics, 68, 614-628, 2003.

6. Chapman, C. H., H. Keers, Application of the Maslov Seismogram Method in Three Dimensions, Stud. Geophys. Ged., 46, 615-649, 2002.

5. Keers, H., D. Vasco, L. Johnson, Viscoacoustic Crosswell Imaging Using Asymptotic Waveforms, Geophysics, 66, 861-870, 2001.

4. Vasco, D., H. Keers, K. Karasaki, Estimation of Reservoir Properties Using Transient Pressure Data: an Asymptotic Approach, Water Resources Research, 36, 3447-3465, 2000.

3. Keers, H., L. Johnson, D. Vasco, Acoustic Crosswell Imaging Using Asymptotic Waveforms, Geophysics, 65, 1569-1582, 2000.

2. Keers, H., F. A. Dahlen, G. Nolet, Chaotic Ray Behavior in Regional Seismology, Geophysical Journal International, 131, 361-380, 1997.

1. Keers, H., G. Nolet, F. A. Dahlen, Ray Theoretical Analysis of Lg, Bulletin of the Seismological Society of America, 86, 726-736, 1995.

Conference Publications

46. Myklebust, T., H. Keers, Elastic isotropic modeling and full waveform inversion for regional seismology, Nordic Seismology Seminar, Helsinki, 2022.

45. de Jonge, T., M. Alerini, H. Keers, Stochastic AVO Inversion: Sensitivity Analysis and Application to the Volve Field, NGF, Bergen, 2021.

44. Galtung, K., H. Keers, M. Sarajærvi, G. Hope, Detection of Temperature Variations in the Ocean using Long Range Acoustics, NGF, Bergen, 2021.

43. Keers, H., K. Galtung, M. Sarajærvi, G. Hope, Efficient Modeling Methods for Long Range Ocean Acoustics (Invited), Conference on Underwater Acoustics UACE, 2021.

42. Keers, H., K. Galtung, M. Sarajærvi, G. Hope, Efficient Modeling Methods for Ocean Acoustics (Invited), International Conference on Underwater Acoustics, 2021.

41. Shidiqqi, A., Newrkla, K., A. Jerkins, H. Keers, L. Ottemöller, Implications of 3D teleseismic ray-tracing on the determination of focal mechanisms, AGU fall meeting, 2019.

40. Sarajærvi, M., H. Keers, Efficient Modeling and Imaging in Viscoelastic Media Using GPUs, EAGE meeting, Copenhagen, 2018.

39. Demuth, A., Ottemöller, L., Keers, H., Lg wave attenuation tomography for Norway, European Seismological Commission meeting, 2016.

38. Minakov, A., D. Kolyukhin, H. Keers, Imaging of 3D ocean turbulence microstructure using low frequency acoustic waves, EGU meeting, 2015.

37. Demuth, A., Ottemöller, L., Keers, H., Detection limits and ambient noise levels of the Norwegian National Seismic Network, ISC meeting, 2014.

36. Cristiano L., A. Minakov, T. Meier, H. Keers, Observation and modeling of azimuthal anisotropy in the lower crust, EGU meeting, 2014.

35. Tengesdal, H, A. Minakov, H. Keers, Hybrid ray-Born and finite difference full waveform inversion, EAGE meeting, 2014.

34. Raeesi, M., K. Atakan, H. Keers, Revisiting the slip distribution of the May 1960 (Mw 9.5) Chile, IASPEI meeting, 2013.

33. Hope, G., Y. Kristoffersen, L. Ottemöller, H. Keers, J. Hall, Studying microseismicity of the Gakkel ridge from drifting sea ice, IASPEI meeting, 2013.

32. Minakov, A. N., H. Tengesdal, A. Libak, H. Keers, R. Mjelde, Acoustic and Elastic Ray- Born Modeling, EGU meeting, 2013.

31. Libak, A., P. Moghaddam, A. Minakov, H. Keers, R. Mjelde, Waveform Inversion in the northern Norwegian-Greenland Sea, EGU meeting, 2013.

30. Hope, G, Y. Kristoffersen, L. Ottemöller, H. Keers, J. Hall, Experience from studying microseismicity from drifting sea ice at the Gakkel ridge, Nordic Seismology Seminar, 2012.

29. Minakov A.N., Mjelde, R., Faleide, J.I., Huismans, R., Dannowski, A., Flueh, E., Glebovsky, V. Yu., Keers, H., Podladchikov, Y., Northern Barents Sea Evolution Linked to the Arctic Ocean, AGU Fall Meeting, 2010.

28. Jakobsen, M., H. Keers, T-matrix Approach to Seismic Modeling in the Acoustic Approximation, Lofoten Conference, 2010.

27. Jakobsen, M., H. Keers, Fast modelling of time-lapse seismic data using integral equation methods. SWLIM meeting, 2010.

26. Jakobsen, M., H. Keers, B. Ruud, I. Psencik and A. Shahraini, Waveform inversion of 4D seismic data using the ray-Born approximation in the frequency domain. EAGE meeting, 2010.

25. Farmani, M. B., N-O. Kitterød, H. Keers, Inverse Modeling of Unsaturated Flow Parameters – What can we learn from GPR Tomography? International Geological Conference (IGC), 2008.

24. Farmani, M. B., N-O. Kitterød, H. Keers, GPR Time-lapse Methods in Hydrology, Annual Conference of the Norwegian Geological Survey (NGU), 2008.

23. Childs, P., Z. Song, P. Kitchenside, C. Thomson, H. Keers, Frechet Kernels for Multiscale Seismic Inversion, SIAM MCIG Conference, 2007.

22. Farmani, M. B., N.-O. Kitterød, H. Keers, Inverse Modeling of Unsaturated Flow Parameters and Geological Structure Conditioned by Time Lapse GPR Tomography, EOS, 92, 2006.

21. Keers, H., T. Standley, A. Kania, Irregular Sampling and Seismic Imaging, EAGE, 68^th EAGE Conference and Exhibition, 2006.

20. Farmani, M. B., H. Keers, N.-O. Kitterød, Imaging Unsaturated Water Flux in an Ice-Contact Delta Structure by GPR Tomography, EGU, 1-10906, 2006.

19. Amodei, D., H. Keers, D. Vasco, L. Johnson, Computing Uniformly Asymptotic Seismograms Using Complex Ray Tracing, American Geophysical Union, Fall Meeting, EOS, 90, 2005.

18. Keers, H., L. Johnson, D. Vasco, Waveform Inversion of Timelapse Data, SWILIM VI Workshop, Prague, 2005.

17. Keers, H., C. Chapman, D. Nichols, A Fast Integration Technique for the Generation of ray- Born synthetics, EAGE, 64^th Conference and Exhibition, 2002.

16. Keers, H., C. Chapman, The Computation of Seismograms in 3D Heterogeneous Media using Maslov Theory, American Geophysical Union, Fall Meeting, EOS, 82, 2001.

15. Keers, H., L. Johnson, D. Vasco, Poroelastic Waveform Inversion of Crosswell Data, American Geophysical Union, Fall Meeting, EOS, 81, 2000.

14. Keers, H., D. Vasco, L. Johnson, Anelastic Waveform Inversion of High Frequency Waves, American Geophysical Union, Fall Meeting, EOS, 80, 1999.

13. Feighner, M. A., R. Gritto, T. M. Daley, H. Keers, E. L. Majer, Seismic Studies at the Ryepatch (Nevada) Geothermal Reservoir, American Geophysical Union, EOS, 80, 1999.

12. Keers, H., L. Johnson, D. Vasco, High Frequency Waveform Inversion of Cross Well Data, Meeting of the International Union of Geodesy and Geophysics, page B219, 1999.

11. Keers, H., L. Johnson, D. Vasco, Cross Well Imaging of Laboratory Data, Annual Meeting of the Seismological Society of America, Seism. Res. Lett., 70, 259, 1999.

10. Keers, H., G. Nolet and F. A. Dahlen, Wave Chaos and Maslov Integrals, EOS, 77, 178, 1996.

9. Keers, H., G. Nolet and F. A. Dahlen, Crustal Wave Propagation in California, EOS, 77, 524, 1996.

8. Keers, H., G. Nolet and F. A. Dahlen, The computation of amplitude envelopes in strongly heterogeneous media; theory and applications, EOS, 77, AGU Fall meeting, F523, 1996.

7. Keers, H., K. Vogfjörd, G. Nolet, F. A. Dahlen, High Frequency Propagation of Crustal Waves, Proceedingsof the 18^th Annual Seismic Research Symposium on Monitoring a Comprehensive Test Ban Treaty, 196-202,1996.

6. Keers, H., K. Vogfjörd, G. Nolet, F. A. Dahlen, Effect of Explosion Depth and Crustal Heterogeneity on Lg Waves, Proceedings of the 17^th Annual Seismic Research Symposium on Monitoring a Comprehensive Test Ban Treaty, 895-902, 1995.

5. Keers, H., G. Nolet and F. A. Dahlen, Chaos and Lg waves, EOS, AGU spring meeting, S204, 1995.

4. Vogfjörd, K., H. Keers, G. Nolet, F. A. Dahlen and R. Phinney, Composition of Lg, NATO Advanced Study Institute on Monitoring a Comprehensive Test Ban Treaty, Alvor, Portugal, 1995.

3. Keers, H., K. Vogfjörd, G. Nolet and R. Phinney, Lg waves by ray and mode summation; a first comparison, 16^th Annual seismic research symposium, AFOSR, 1994.

2. Keers, H., K. Vogfjörd, G. Nolet and R. Phinney, Lg synthesis in media with undulating surfaces by ray summation, EOS, AGU fall mtg, 420, 1994.

1. Keers, H., G. Nolet, Lg-wave propagation using mode and ray summation. EOS, Transactions AGU spring mtg, suppl, 227, 1994.

 

Patents

9. Keers, H., Melbø-Strommen, A., Hopperstad, J.-F., Robertsson, J., Kragh E., Svendsen, M., Yang, L., Frivik, S., Acquiring near-zero offset survey data, Patent WO2009/148900, US patent 8467264, 2013.

8. Keers, H., Vongtragool, S., Welker, K., Frivik, S., Groenaas, H., Determining Positioning of Survey Equipment Using a Model, US patent 8094513, 2012.

7. Keers, H., Geophysical Signal Processing, US patent 0128817, 2011.

6. Keers, H., Kitchenside, P., Nichols, D., Rentsch, S., Busanello, G., Migration velocity analysis using seismic data, US patent 0085413, 2011.

5. Kitchenside, P., Busanello, G., Keers, H., Imaging with Vector Measurements, Patent WO/2010/091115, US/2010/0202250, 2010.

4. Keers, H., Childs, P., Using Waveform Inversion to Determine Properties of a Subsurface Medium, Patent WO/2010/0065778, US patent 0142316, 2010.

3. Tustin, G., Meeten, G., Jones, T., Anderson, V., Trætten, Ø., Keers, H., Kristiansen, O., Heieren, N.-H., Combee, L., Kjellesvig, B., Seismic Data Acquisition Assembly, Patent WO/2010/021880, US/2010/00039890, 2010.

2. Keers, H., H. Bernth, C. Chapman, D. Nichols, Processing Seismic Data, Patent US/2005/0143923, 2005.

1. Martin, J., E. Muyzert, H. Keers, J. Robertsson, N. Goujon, K. Tjom, Seismic Sensing Cable Catenary Shape Determination, Patent GB/2003/004476, 2003.

Reports and White Papers

Keers, H (one of 13 co-authors), European Plate Observing System: A European large scale infrastructure initiative for solid Earth science observations, Norwegian White Paper, 2012.

Feighner, M. A., R. Gritto, T. M. Daley, H. Keers, E. L. Majer, Three-Dimensional Seismic Imaging of the Ryepatch Geothermal Reservoir, Earth Sciences Division, Lawrence Berkeley National Laboratory, Report LBNL-44119, 1999.

Numerous confidential reports and invention disclosures for Schlumberger