Andrew J Barbour, Ph.D.

I'm a research geophysicist in the Induced Seismicity group. My research focuses on improving our understanding of how stress changes from natural and anthropogenic sources (i.e., earthquake rupture and/or fluid injection) lead to deformation, seismicity patterns, fluid flow, and pore pressure in the Earth's crust. I am particularly interested in observations near active fault systems.



2016 — present: Research Geophysicist, Earthquake Science Center, U.S. Geological Survey, Menlo Park, CA

2014 — 2016: Mendenhall Postdoctoral Fellowship, Earthquake Science Center, U.S. Geological Survey, Menlo Park, CA

Project: "Assessment of the Efficacy of Fluid Injection Models, and Permeability Enhancement due to Earthquake Rupture"; Advisor: Stephen Hickman


2014 — Ph.D. Earth Sciences, Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California at San Diego

Thesis: "Investigations of fluid-strain interaction using Plate Boundary Observatory borehole data" (; Advisor: Duncan Agnew

2006 — B.S. Mechanical Engineering, Jacobs School of Engineering, University of California at San Diego


    Contact me ( for a copy of any of these papers. See also my Google Scholar page:

    In review:

    Fan, W., Barbour, A. J., McGuire, J. J., Huang, Y., Lin, G., Cochran, E. S., and R. Okuwaki, Very low frequency earthquakes in between the seismogenic and tremor zones in Cascadia?

    Fan, W., Okuwaki, R., Barbour, A. J., Huang, Y., Lin, G., and E. S. Cochran, Fast rupture of the 2009 Mw 6.9 Canal de Ballenas earthquake in the Gulf of California dynamically triggers seismicity in California

    Materna, K., Barbour, A. J., Jiang, J., and M. Eneva, A Decade of Crustal Deformation and Aseismic Slip at the North Brawley Geothermal Field

    Wang, S., Jiang, G., Lei, L., Barbour, A. J., Tan, X., Xu, C., and X. Xu, Three Mw≥4.7 earthquakes within the Changning (China) shale gas field ruptured shallow faults intersecting with hydraulic fracturing wells


    31. Barbour, A. J., and N. M. Beeler (2021), Teleseismic Waves Reveal Anisotropic Poroelastic Response of Wastewater Disposal Reservoir, Earth and Planetary Physics, 5(6), 547–558, DOI: 10.26464/epp2021034

    30. Jiang, G., Liu, L., Barbour, A. J., Yang, H., and R. Lu (2021), Physics-based Evaluation of the Maximum Magnitude of Potential Earthquakes Induced by the Hutubi (China) Underground Gas Storage, Journal of Geophysical Research: Solid Earth, 126, e2020JB021379, DOI: 10.1029/2020JB021379

    29. Barbour, A. J., J. O. Langbein, and N. S. Farghal (2021), Earthquake Magnitudes from Dynamic Strain, Bulletin of the Seismological Society of America, 111 (3), DOI: 10.1785/0120200360

    28. Rubinstein, J. L., Barbour, A. J., and J. H. Norbeck (2021), Forecasting Induced Earthquake Hazard Using a Hydromechanical Earthquake Nucleation Model, Seismological Research Letters, DOI: 10.1785/0220200215

    27. Fan, W., Barbour, A. J., Cochran, E. S., and G. Lin (2021), Characteristics of Frequent Dynamic Triggering of Microearthquakes in Southern California, Journal of Geophysical Research: Solid Earth, 126, e2020JB020820, DOI: 10.1029/2020JB020820

    26. Skoumal, R. J., Kaven, J. O., Barbour, A. J., Wicks, C., Brudzinski, M. R., Cochran, E. S., and J. L. Rubinstein (2021), The Induced Mw 5.0 March 2020 West Texas Seismic Sequence, Journal of Geophysical Research: Solid Earth, 126, e2020JB020693, DOI: 10.1029/2020JB020693

    25. Farghal, N. S., Barbour, A. J., and J. O. Langbein (2020), The Potential of Using Dynamic Strains in Earthquake Early Warning Applications, Seismological Research Letters, 91(5), 2817-2827, DOI: 10.1785/0220190385

    24. Hirakawa, E. T., and A. J. Barbour (2020), Kinematic Rupture and 3D Wave Propagation Simulations of the 2019 Mw 7.1 Ridgecrest, California Earthquake, Bulletin of the Seismological Society of America, 110(4), 1644-1659, DOI: 10.1785/0120200031

    23. Silverii, F., Montgomery-Brown, E., Borsa, A., and A. J. Barbour (2020), Hydrologically-induced deformation in Long Valley Caldera and adjacent Sierra Nevada, Journal of Geophysical Research: Solid Earth, 125, e2020JB019495, DOI: 10.1029/2020JB019495

    22. Skoumal, R. J., Barbour, A. J., Brudzinski, M. R., Langenkamp, T., and J. O. Kaven (2020), Induced seismicity in the Delaware Basin, Texas, Journal of Geophysical Research: Solid Earth, 125, e2019JB018558, DOI: 10.1029/2019JB018558

    21. Barbour, A. J., and F. Pollitz (2019), Induced Seismicity Reduces Seismic Hazard? Geophysical Research Letters, 46 (Commentary), DOI: 10.1029/2019GL081991

    20. Barbour, A. J., L. Xue, E. Roeloffs, and J. L. Rubinstein (2019), Leakage and Increasing Fluid Pressure Detected in Oklahoma’s Wastewater Disposal Reservoir, Journal of Geophysical Research: Solid Earth, 124, 2896–2919, DOI: 10.1029/2019JB017327, Datasets:

    19. Skoumal, R., Ries, R., Brudzinski, M., Barbour, A. J., and B. Currie (2018), Earthquakes Induced by Hydraulic Fracturing are Pervasive in Oklahoma, Journal of Geophysical Research: Solid Earth, 123, 10918–10935, DOI: 10.1029/2018JB016790

    18. Eneva, M., Barbour, A. J., Adams, D., Hsiao, V., Blake, K., Falorni, F., and R. Locatelli (2018), Satellite Observations of Surface Deformation at the Coso Geothermal Field, California, Geothermal Resources Council Transactions, 42, 1383-1401, Permalink (contact me for a pdf)

    17. Cochran, E.S., Aagaard, B.T., Allen, R.M., Andrews, J., Baltay, A.S., Barbour, A. J., Bodin, P., Brooks, B.A., Chung, A., Crowell, B.W., Given, D.D., Hanks, T.C., Hartog, J.R., Hauksson, E., Heaton, T.H., McBride, S., Meier, M-A., Melgar, D., Minson, S.E., Murray, J.R., Strauss, J.A., and D. Toomey (2018), Research to Improve ShakeAlert Earthquake Early Warning Products and Utility, U.S. Geological Survey Open-File Report 2018–1131, 17 p., DOI: 10.3133/ofr20181131

      16. Wang, C. Y., M. L. Doan, L. Xue, and A. J. Barbour (2018), Tidal response of groundwater in a leaky aquifer: application to Oklahoma, Water Resources Research, 54, 8019 — 8033, DOI: 10.1029/2018WR022793, Datasets:

      15. McGarr, A., and A. J. Barbour (2018), Injection‐Induced Moment Release Can Also Be Aseismic, Geophysical Research Letters, 45(11), 5344 — 5351, DOI: 10.1029/2018GL078422

      14. Crandall-Bear, A. T., A. J. Barbour, and M. Schoenball (2018), Irregular Focal Mechanisms Observed at Salton Sea Geothermal Field: Possible Influences of Anthropogenic Stress Perturbations, Proceedings of the 43rd Workshop on Geothermal Reservoir Engineering, SGP-TR-213, Stanford University, Stanford, California, 12-14 Feb., Published online:

      13. McGarr, A., and A. J. Barbour (2017), Wastewater disposal and the earthquake sequences during 2016 near Fairview, Pawnee, and Cushing, Oklahoma, Geophysical Research Letters, 44(18), 9330 — 9336, DOI: 10.1002/2017GL075258

      12. Wang, C.-Y., and A. J. Barbour (2017), Influence of pore pressure change on coseismic volumetric strain, Earth and Planetary Science Letters, 45, 152 — 159, DOI: 10.1016/j.epsl.2017.07.034

      11. Barbour, A. J., J. H. Norbeck, and J. L. Rubinstein (2017), The Effects of Varying Injection Rates in Osage County, Oklahoma, on the 2016 M5.8 Pawnee Earthquake, Seismological Research Letters, 88(4), 1040 — 1053, DOI: 10.1785/0220170003

          Selected press coverage:

      10. Barbour, A. J., and B. W. Crowell (2017), Dynamic Strains for Earthquakes Source Characterization, Seismological Research Letters, 88(2A), 354 — 370, DOI: 10.1785/0220160155, Datasets:

      9. Barbour, A. J., E. L. Evans, S. H. Hickman, and M. Eneva (2016), Subsidence Rates at the Southern Salton Sea Consistent with Reservoir Depletion, Journal of Geophysical Research: Solid Earth, 121(7), 5308 — 5327, DOI: 10.1002/2016JB012903

      8. Barbour, A. J., E. L. Evans, S. H. Hickman, and M. Eneva (2016), Sources of Subsidence at the Salton Sea Geothermal Field, Proceedings of the 41st Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, February 22-24, SGP-TR-209,  Published [online]

      7. Barbour, A. J., D. C. Agnew, and F. K. Wyatt (2015), Coseismic Strains on Plate Boundary Observatory Borehole Strainmeters in Southern California, Bulletin of the Seismological Society of America, 105(1), 431 — 444, DOI: 10.1785/0120140199

      6. Barbour, A. J., (2015), Pore-Pressure Sensitivities to Dynamic Strains: Observations in Active Tectonic Regions, Journal of Geophysical Research: Solid Earth, 120, 5863 — 5883, DOI: 10.1002/2015JB012201

      5. Barbour, A.J., and E. Roeloffs (2015), Direct Observation of Fluid-Strain Interactions Around Active Faults, Future Seismic and Geodetic Facility Needs in the Geosciences, 21-May-2015, Published [online]

      4. Barbour, A. J., and R. L. Parker (2014), psd: Adaptive, Sine Multitaper Power Spectral Density Estimation for R, Computers & Geosciences, 63, 1 — 8, DOI: 10.1016/j.cageo.2013.09.015

      3. Barbour, A. J., and F. K. Wyatt (2014), Modeling Strain and Pore Pressure Associated with Fluid Extraction: The Pathfinder Ranch Experiment, Journal of Geophysical Research: Solid Earth, 119(6), 5254 — 5273, DOI: 10.1002/2014JB011169, Datasets:

      2. Barbour, A. J., and D. C. Agnew (2012), Detection of Seismic Signals Using Seismometers and Strainmeters, Bulletin of the Seismological Society of America, 102(6), 2484 — 2490, DOI: 10.1785/0120110298

      1. Barbour, A. J., and D. C. Agnew (2011), Noise Levels on Plate Boundary Observatory Borehole Strainmeters in Southern California, Bulletin of the Seismological Society of America, 101(5), 2453 — 2466, DOI: 10.1785/0120110062



      Data from the USGS pressure-monitoring project in Oklahoma are freely available here: