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    Small Earthquake Science @ the University of Oregon

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    Small Earthquake Science @ the University of Oregon

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    Small Earthquake Science @ the University of Oregon

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    Small Earthquake Science @ the University of Oregon


We are a group of earthquake seismologists and active tectonicists interested in the physical properties of faults, seismotectonics, crustal deformation, and the mechanics of earthquakes and faulting. We use a variety of tools, such as moment tensor inversion, waveform modeling, analysis of seismicity catalogs, and numerical models of fault friction to approach research questions. We reside in the Department of Earth Sciences at the University of Oregon. Active research projects and interests include

  • Earthquake source physics
  • Rheology of deep fault zones
  • Fluids and faulting
  • Seismotectonics of northern California and the Pacific Northwest
  • Nodal seismic deployments
  • Machine Learning
  • Earthquake hazards
  • Volcano Seismology

What we do

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Amanda Thomas

Benevolent Dictator

Jonathan Delph

Postdoctoral Scholar

Khurram Aslam

Postdoctoral Scholar

Tyler Newton

PhD Student

Tim Lin

PhD Student

Avigyan Chatterjee

PhD Student


Motivational Speaker



Alex Babb

Now @ PNSN

Quentin Bletery

Now @ IRD, GĂ©oazur

Geena Littel

PhD student @ UBC

Emily Sexton

Now @ ExxonMobil

Rob Skarbek

Research Scientist @ LDEO


  1. Wech, A. G., W. A. Thelen, and A. M. Thomas (20??) Deep long-period earthquakes generated by second boiling beneath Mauna Kea volcano. Submitted.
  2. Newton, T. J. and A. M. Thomas (20??) Stress orientations in the Nankai Trough constrained using seismic and aseismic slip. Submitted to JGR-Solid Earth.
  3. Goldberg, D. E., D. Melgar, V. J. Sahakian, A. M. Thomas, X. Xu, J. Geng, and B. W. Crowell (20??) Complex Rupture of an Immature Fault Zone: A Simultaneous Kinematic Model of the 2019 Ridgecrest, CA Earthquakes. In revision for Geophysical Research Letters.
  4. Thomas, A. M., Z. Spica, M. Bodmer, W. H. Schultz, and J. R. Roering (2019) Using a dense seismic array to determine resonances and structure of the Two Towers earthflow in Northern California. Accepted in Seismological Research Letters.
  5. Lin, J.-T., W. Chang, D. Melgar, A. M. Thomas, and C. Chiu (2019) Quick Determination of Earthquake Source Parameters from GPS Measurements: Cases of Taiwan Earthquakes. Geophysical Journal International. doi: 10.1093/gji/ggz359. [PDF]
  6. Hawthorne, J. C., A. M. Thomas, and J.-P. Ampuero (2018) The rupture extent of low frequency earthquakes near Parkfield, CA. Geophysical Journal International. doi: 10.1093/gji/ggy429. [PDF]
  7. Littel, G., A. M. Thomas, and A. S. Baltay (2018) Using tectonic tremor to constrain seismic-wave attenuation in Cascadia. Geophysical Research Letters.doi: 10.1029/2018GL079344. [PDF]
  8. Parker, L., C. H. Thurber, X. Zeng, P. Li, N. Lord, D. Fratta, H. F. Wang, M. Robertson, A. M. Thomas, M.Karplus, A. Nayak, and K. L. Feigl (2018) Active-Source Seismic Tomography at the Brady Geothermal Field, Nevada, with Dense Nodal and Fiber-Optic Seismic Arrays. Seismological Research Letters. doi: 10.1785/0220180085. [PDF]
  9. Beeler, N. M., A. M. Thomas, R. Burgmann, and D. R. Shelly (2018) Constraints on friction, dilatancy, diffusivity, and effective stress from low-frequency earthquake rates on the deep San Andreas Fault. JGR-Solid Earth. doi: 10.1002/2017JB015052. [PDF]
  10. Thomas, A. M., N. M. Beeler, Q. Bletery, R. Burgmann, and D. R. Shelly (2018) Using low frequency earthquake families on the San Andreas fault as deep creepmeters. JGR-Solid Earth.doi: 10.1002/2017JB014404. [PDF]
  11. Bletery, Q., A. M. Thomas, A. W. Rempel, and J. L. Hardebeck (2017) Imaging shear strength along subduction faults. Geophysical Research Letters. doi: 10.1002/2017GL075501. [PDF]
  12. Bletery, Q., A. M. Thomas,, J. C. Hawthorne, R. M. Skarbek, A. W. Rempel, and R. D. Krogstad (2017) Characteristics of secondary slip fronts associated with slow earthquakes in Cascadia. Earth and Planetary Science Letters doi:10.1016/j.epsl.2017.01.046. [PDF]
  13. Bostock, M. G., A. M. Thomas, A. M. Rubin, and N. I. Christensen (2017) On corner frequencies, attenuation, and low-frequency earthquakes. JGR-Solid Earth. doi:10.1002/2016JB013405. [PDF]
  14. Hawthorne, J. C., M. G. Bostock, A. Royer, and A. M. Thomas (2016) Variations in slow slip moment rate associated with rapid tremor reversals in Cascadia. G-Cubed. doi:10.1002/2016GC006489. [PDF]
  15. Bletery, Q., A. M. Thomas, A. W. Rempel, L. Karlstrom, A. Sladen and L. De Barros (2016) Mega-earthquakes rupture flat megathrusts. Science. doi:10.1126/science.aag0482. [PDF]
  16. Thomas, A. M., G. C. Beroza and D. R. Shelly (2016) Constraints on the Source Parameters of Low-Frequency Earthquakes on the San Andreas Fault. Geophysical Research Letters. doi:10.1002/2015GL067173. [PDF]
  17. Beeler, N. M., G. H. Hirth, A. M. Thomas, and R. Burgmann (2016) Effective stress, friction and deep crustal faulting. JGR-Solid Earth. doi:10.1002/2015JB012115. [PDF]
  18. Bostock, M. G., A. M. Thomas, G. Savard, L. Chuang, and A. Rubin (2015) Magnitudes and moment-duration scaling of low-frequency earthquakes beneath southern Vancouver Island. JGR-Solid Earth. doi:10.1002/2015JB012195. [PDF]
  19. Thomas, A. M. and M. G. Bostock (2015) Identifying low-frequency earthquakes in central Cascadia using cross-station correlation. Tectonophysics. doi:10.1016/j.tecto.2015.07.013. [PDF]
  20. Kyriakopoulos, C., A. V. Newman, A. M. Thomas, M. Moore-Driskell, and G. T. Farmer (2015) A new seismically constrained subduction interface model for Central America. JGR-Solid Earth. doi:10.1002/2014JB011859. [PDF]
  21. Plourde, A., M. G. Bostock, P. Audet, and A. M. Thomas (2015) Low-frequency earthquakes at the southern Cascadia margin. Geophysical Research Letters. doi:10.1002/2015GL064363. [PDF]
  22. Royer, A., A. M. Thomas, and M. G. Bostock (2014) Tidal Modulation of Low Frequency Earthquakes and triggering of secondary events in Northern Cascadia. JGR-Solid Earth. doi:10.1002/2014JB011430. [PDF]
  23. Thurber, C. H., X. Zeng, A. M. Thomas and P. Audet (2014) Phase-Weighted Stacking Applied to Low-Frequency Earthquakes. Bulletin of the Seismological Society of America. doi:10.1785/0120140077. [PDF]
  24. Culha, C., A. Hayes, M. Manga, and A. M. Thomas (2014) Double ridges on Europa accommodate some of the missing surface contraction. JGR-Planets. doi:10.1002/2013JE004526. [PDF]
  25. Beeler, N. M., A. M. Thomas, R. Burgmann, and D. R. Shelly (2013) Inferring fault rheology from low frequency earthquakes on the San Andreas fault. JGR-Solid Earth. doi:10.1002/2013JB010118. [PDF]
  26. Thomas, A. M., R. Burgmann, and D. S. Dreger (2013) Incipient faulting near Lake Pillsbury, CA and the role of accessory faults in plate boundary evolution. Geology. doi:10.1130/G34588.1 [PDF]
  27. Thomas, A. M. (2013) Fact or friction: Inferring rheology from low-frequency earthquakes on the San Andreas fault. UC-Berkeley PhD Dissertation.
  28. McLaskey, G. C., A. M. Thomas, S. D. Glaser, R. M. Nadeau (2012) Fault healing promotes high frequency earthquakes in the laboratory and on natural faults. Nature. doi:10.1038/nature11512. [PDF]
  29. Thomas, A. M., R. Burgmann, D. R. Shelly, N. M. Beeler, and M. L. Rudolph (2012) Tidal sensitivity of low frequency earthquakes near Parkfield, CA: implications for fault mechanics within the brittle-ductile transition. JGR-Solid Earth. doi:10.1029/2011JB009036 [PDF]
  30. Thomas, A.M., R. M. Nadeau, and R. Burgmann (2009) Tremor-tide correlations and near-lithostatic pore pressure on the deep San Andreas fault. Nature. doi:10.1038/nature08654 [PDF]
  31. Ghosh, A., A. V. Newman, A. M. Thomas, and G. T. Farmer (2008) Interface locking along the subduction megathrust from b-value mapping near Nicoya Peninsula, Costa Rica. Geophysical Research Letters. doi:10.1029/2007GL031617 [PDF]


If you're trying to decide which graduate school you'd like to attend, here are some reasons why you should choose the University of Oregon in Eugene.

Earthquake Seismology @ UO

My group works on problems in seismology, fault mechanics, active tectonics, etc. Additionally, our department hosts one of the largest geophysics programs in the country that includes 25 faulty members with wide ranging interests. If you're interested in attending graduate school in earthquake seismology at UO please send me an email with a copy of your CV and a statement of why you're interested in working with me. I'm particularly interested in taking students that have ideas of what they'd like to work on and why we'd be a good fit. There are currently no funded postdoctoral positions available however, if you're interested in writing a proposal to come to Oregon please let me know.

Earth Sciences @ UO

The University of Oregon's Department of Earth Sciences is among the top geoscience programs in the world. Our faculty members are nationally and internationally recognized leaders in their fields. We're a big department at 25ish faculty members and 45ish graduate students, but we're not too big. You'll still have regular meetings with your advisor(s), have the chance to interact with all faculty members, and there's a healthy graduate community to support you in your research endeavors. Many of our recent graduates have gone on to prestigious postdocs at national institutions, such as the USGS, or to other top rated Earth science programs while others acquire faculty positions at schools throughout the US.


Eugene is a big-small town centered around the University of Oregon. With a population of approximately 150,000 it has all the conveniences of a larger city (e.g. restaurants, airport, etc.) without the traffic or the crowds. After living here for a few years my observations are that it sometimes rains, the softball leagues are very competitive, and some parts of town (and the people that live in them) are stuck in the 1970s. Also, the views of the Cascades, especially the Three Sisters volcanoes, do not get old.


Oregon is wild, beautiful, and unspoiled. An hour drive west of Eugene is the breathtaking Oregon coast where you can fish, surf, and eat local all in a day trip. You'll likely have whatever beach you choose to visit to yourself. An hour to the east are the Oregon Cascades. Both downhill and cross country skiing are slightly over an hour away. Two hours north, you'll find Portland, OR. A beer, dub-step, and hipster mecca, you'll need to make a pilgrimage north at some point, if not for Portland itself, to ski above the clouds at Mt. Hood or tour the spectacular waterfalls of the Columbia River Gorge. Two plus hours south is Crater Lake National Park.



Amanda M. Thomas
Associate Professor
Department of Earth Sciences
1272 University of Oregon
Eugene, OR 97403
Office: Cascade 210C
Email: amt.seismo@gmail.com