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


I run the USGS pressure-monitoring project in Oklahoma. The data are freely available here:


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

21. Barbour, A. J., and F. Pollitz (2019), Induced seismicity reduces seismic hazard? Geophysical Research Letters, 46, 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, 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(10), 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 their 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(10), 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