David Shelly

I earned my Ph.D. from Stanford University in 2007, focused on understanding the mechanism of "non-volcanic tremor" in the Nankai subudction zone.  After finishing my Ph.D., I was a Miller Postdoctoral Fellow at UC Berkeley and a Mendenhall Postdoctoral Fellow in the USGS Earthquake Science Center.  From 2010-2018 I was a Research Geophysicist with the USGS Volcano Science Center (California and Yellowstone Volcano Observatories) in Menlo Park, California.   I am now a member of the Geologic Hazards Science Center in Golden, Colorado.

I'm working maximize the information we can obtain from seismic records of faulting processes.  This information is then combined with other available constraints (e.g. geodetic, geologic, geochemical) to understand what these seismic signals can tell us about physical (tectonic, hydrothermal, and/or magmatic) processes in the subsurface.

Professional Experience

2018-present - Research Geophysicist, Geologic Hazards Science Center, U.S. Geological Survey, Golden, CO

2010-2018 - Research Geophysicist, Volcano Science Center, U.S. Geological Survey, Menlo Park, CA

2008-2010 - Mendenhall Postdoctoral Fellow, Earthquake Science Center, U.S. Geological Survey, Menlo Park, CA

2007-2008 - Miller Postdoctoral Fellow, Department of Earth and Planetary Science, Unversity of California, Berkeley

Education

2007 - Ph.D., Geophysics, Stanford University, Stanford, CA

2000 - B.A. Mathematics-Physics, Whitman College, Walla Walla, WA

Major Awards

2012 - Macelwane Medal, presented by the American Geophysical Union for significant contributions to the geophysical sciences by an outstanding early career scientist.

2012 - Fellow, American Geophysical Union

2011 - Presidential Early Career Awards for Scientists and Engineers (PECASE) recipient, the highest honor bestowed by the United States government on science and engineering professionals in the early stages of their independent research careers.

2011 - Charles F. Richter Early Career Award, Seismological Society of America, awarded to one early career scientist annually for outstanding contributions to the Society

2008 - Inaugural recipient of the Keiiti Aki Young Scientist Award, American Geophysical Union Seismology Section, given to recognize the scientific accomplishments of a junior scientist who makes outstanding contributions to the advancement of seismology.

Other Recognitions

2015 - Editor’s Citation for Excellence in Refereeing, Geophysical Research Letters

2014 - Kavli Fellow, National Academy of Sciences

2010 - Editor’s Citation for Excellence in Refereeing, Geophysical Research Letters

Publications

Flinders, A. F., D. R. Shelly, P. B. Dawson, D. P. Hill, B. Tripoli, and Y. Shen (2018), Seismic evidence for significant melt beneath the Long Valley Caldera, California, Geology, doi:10.1130/G45094.1.

Hotovec-Ellis, A., D. R. Shelly, D. P. Hill, A. M. Pitt, P. B. Dawson, B. A. Chouet (2018), Deep fluid pathways beneath Mammoth Mountain, California, illuminated by migrating earthquake swarms, Science Advances, 4(8), eaat5258, doi:10.1126/sciadv.aat5258.

Nakata, N. and D. R. Shelly (2018), Imaging a crustal low-velocity layer using reflected seismic waves from the 2014 earthquake swarm at Long Valley Caldera, California: the magmatic system roof?, Geophysical Research Letters, 45, 3481–3488. https://doi.org/10.1029/2018GL077260.

Norbeck, J., and D. R. Shelly (2018). Exploring the Role of Mixed-Mechanism Fracturing and Fluid-Faulting Interactions During the 2014 Long Valley Caldera, California, Earthquake Swarm. In 43rd Workshop on Geothermal Reservoir Engineering. Stanford, CA, USA (pp. 1-16) (conference paper)

Xue, L., R. Bürgmann, D. R. Shelly, C. W. Johnson, and T. Taira (2018), Kinematics of the 2015 San Ramon, California earthquake swarm: Implications for fault zone structure and driving mechanisms, Earth and Planetary Science Letters, 489, 135-144.  

Beeler, N., A. Thomas, R. Bürgmann, and D. R. Shelly (2018), Constraints on friction, dilatancy, diffusivity, and effective stress from low-frequency earthquake rates on the deep San Andreas Fault,  J. Geophys. Res., 123, 583-605.

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, J. Geophys. Res., 122, 457-475,  doi:10.1002/2017JB014404.

Shelly, D. R. (2017), A 15-year catalog of more than 1 million low-frequency earthquakes: tracking tremor and slip along the deep San Andreas Fault, J. Geophys. Res. Solid Earth, 122, doi:10.1002/2017JB014047.

Hurwitz, S., and D.R. Shelly (2017). Illuminating the voluminous subsurface structures of Old Faithful geyser, Yellowstone National Park, Geophysical Research Letters, 44. https://doi.org/10.1002/2017GL075833 (commentary)

Shelly, D. R., J. L. Hardebeck, W. L. Ellsworth, and D. P. Hill (2016), A new strategy for earthquake focal mechanisms using waveform-correlation-derived relative polarities and cluster analysis: Application to the 2014 Long Valley Caldera earthquake swarm, J. Geophys. Res. Solid Earth, 121, doi:10.1002/2016JB013437.

Shelly, D. R., W. L. Ellsworth, and D. P. Hill (2016), Fluid-faulting evolution in high definition: connecting fault structure and frequency-magnitude variations during the 2014 Long Valley Caldera, California earthquake swarm, J. Geophys. Res. Solid Earth, 121, 1776-1795, doi:10.1002/2015JB012719.  [Supplemental Movie S1, Movie S2, Movie S3]

Hardebeck, J. L., & D. R. Shelly (2016). Aftershocks of the 2014 South Napa, California, Earthquake: Complex Faulting on Secondary Faults. Bulletin of the Seismological Society of America,doi:10.1785/0120150169.

van der Elst, N. J., A. A. Delorey, D. R. Shelly, and P. A. Johnson (2016), Fortnightly modulation of San Andreas tremor and low-frequency earthquakes, PNAS, 113(31), 8601-8605. 

Zeng, X., C. H. Thurber, D. R. Shelly, R. M. Harrington, E. S. Cochran, N. L. Bennington, D. Peterson, B. Guo, and K. McClement (2016) Three-dimensional P- and S-wave velocity structure and low-frequency earthquake locations in the Parkfield, California region, Geophys. J. Int., 206(3), 1574-1585 doi: 10.1093/gji/ggw217. 

Hauksson, E., J. Andrews, A. Plesch, J.H. Shaw, and D. R. Shelly (2016). The 2015 Fillmore Earthquake Swarm and Possible Crustal Deformation Mechanisms near the Bottom of the Eastern Ventura Basin, California. Seismological Research Letters, doi: 10.1785/0220160020.

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, Geophys. Res. Lett., 43, doi:10.1002/2015GL067173

Shelly, D. R., T.’a. Taira, S. G. Prejean, D. P. Hill, and D. S. Dreger (2015), Fluid-faulting interactions: Fracture-mesh and fault- valve behavior in the February 2014 Mammoth Mountain, California, earthquake swarm, Geophys. Res. Lett., 42, doi:10.1002/ 2015GL064325. [Supplemental Movie S1]

Shelly, D. R. (2015), Complexity of the deep San Andreas Fault zone defined by cascading tremor, Nature Geoscience, doi:10/1038/ngeo2335.

Ingebritsen, S. E., D. R. Shelly, P. A. Hsieh, L. E. Clor, P. H. Seward, and W. C. Evans (2015), Hydrothermal response to a volcano-tectonic earthquake swarm, Lassen, California, Geophys. Res. Lett., 42, doi:10.1002/2015GL065826.

Peng, Z., D. R. Shelly, and W. L. Ellsworth (2015), Delayed Dynamic Triggering of Deep tremor along the Parkfield-Cholame Section of the San Andreas Fault Following the 2014 M6.0 South Napa earthquake, Geophys. Res. Lett., 42, doi:10.1002/2015GL065277.

Montgomery‐Brown, E. K., C. Wicks, P. Cervelli, J. O. Langbein, J. Svarc, D. R. Shelly, D. P. Hill, and M. Lisowski (2015), Renewed inflation of Long Valley Caldera, California (2011 to 2014), Geophysical Research Letters. doi: 10.1002/2015GL064338

Wu, C., R. Guyer, D. R. Shelly, D. Trugman, W. Frank, J. Gomberg, and P. Johnson (2015), Spatial-temporal variation of low-frequency earthquake bursts near Parkfield, California. Geophysical Journal International, 202(2), 914-919.

Brocher, T.M., A. S. Baltay, J. L. Hardebeck, F. F. Pollitz, J. R. Murray, A. L. Llenos, D. P. Schwartz, J. L. Blair, D. J. Ponti, J. J. Lienkaemper, V. E. Langenheim, T. E. Dawson, K. W. Hudnut, D. R. Shelly, D. Dreger, J. Boatwright, B. T. Aagaard, D. J. Wald, R. M. Allen, W. D. Barnhart, K. L. Knudsen, B. A. Brooks, and K. M. Scharer, (2015), The M_w 6.0 24 August 2014 South Napa Earthquake, Seism. Res. Lett., 86 (2A), 309-326.

Chamberlain, C. J., D. R. Shelly, J. Townend, and T. A. Stern (2014), Low-frequency earthquakes reveal punctuated slow slip on the deep extent of the Alpine Fault, New Zealand, Geochem. Geophys. Geosyst., 15, 2984–2999, doi:10.1002/2014GC005436.

Lewicki, J. L., G. E. Hilley, D. R. Shelly, J. C. King, J. P. McGeehin, M. Mangan, and W. C Evans (2014), Crustal migration of CO₂-rich magmatic fluids recorded by tree-ring radiocarbon and seismicity at Mammoth Mountain, CA, USA, Earth and Planetary Science Letters, doi:10.1016/j.epsl.2013.00.832.

Shelly, D. R., D. P. Hill, F. Massin, J. Farrell, R. B. Smith, and T. Taira (2013), A fluid-driven earthquake swarm on the margin of the Yellowstone caldera, J. Geophys. Res. Solid Earth, 118, 4872-4886, doi:10.1002/jgrb.50362.  [Research Highlight in Nature Geoscience]

Shelly, D. R., S. C. Moran, and W. A. Thelen (2013), Evidence for fluid-triggered slip in the 2009 Mount Rainier, Washington earthquake swarm, Geophys. Res. Lett., 40, 1506-1512, doi:10.1002/grl.50354.

Beeler, N. M., A. Thomas, R. Bürgmann, and D. R. Shelly (2013), Inferring fault rheology from low-frequency earthquakes on the San Andreas, J. Geophys. Res. Solid Earth, 118, 5976–5990, doi:10.1002/2013JB010118.

Wu, C., D. R. Shelly, J. Gomberg, Z. Peng, and P. Johnson (2013), Long-term changes of inter-event times for regular and low-frequency earthquakes in central California, Earth and Planetary Science Letters, 368, 144-150, doi:10.1016/j.epsl.2013.03.007.

Johnson, K. M., D. R. Shelly, and A. M. Bradley (2013), Simulations of tremor-related creep reveal a weak crustal root of the San Andreas Fault, Geophys. Res. Lett., doi:10.1002/grl.50216.

Hill, D. P., Z. Peng, D. R. Shelly, and C. Aiken (2013), S-wave triggering of tremor beneath the Parkfield, CA, section of the San Andreas Fault by the 2011 Tohoku Japan earthquake: observations and theory, Bull. Seismol. Soc. Am., doi:10.1785/0120120114, 103, 1541-1550.

Thomas, A. M., R. Bürgmann, D. R. Shelly, N. M. Beeler, and M. L. Rudolph (2012), Tidal triggering of low frequency earthquakes near Parkfield, California: Implications for fault mechanics within the brittle-ductile transition, J. Geophys. Res., 117, B05301, doi:10.1029/2011JB009036.

Peng, Z., C. Aiken, D. Kilb, D. R. Shelly, B. Enescu (2012), Listening to the 2011 magnitude 9.0 Tohoku-Oki, Japan earthquake, Seismol. Res. Lett., 83(2), 287-293, doi: 10.1785/gssrl.83.2.287.

Shelly, D. R. and D. P. Hill (2011), Migrating swarms of brittle-failure earthquakes in the lower crust beneath Mammoth Mountain, California, Geophys. Res. Lett., 38, L20307, doi:10.1029/2011GL049336.

Shelly, D. R. and K. M. Johnson (2011), Tremor reveals stress shadowing, deep postseismic creep, and depth-dependent slip recurrence on the lower-crustal San Andreas fault near Parkfield,Geophys. Res. Lett., L13312, doi:10.1029/2011GL047863.

Shelly, D. R., Z. Peng, D. P. Hill, and C. Aiken (2011), Triggered creep as a possible mechanism for delayed dynamic triggering of tremor and earthquakes, Nature Geoscience,doi:10.1038/NGEO1141.

Daub, E. G., D. R. Shelly, R. A. Guyer, and P. A. Johnson (2011), Brittle and ductile friction and the physics of tectonic tremor, Geophys. Res. Lett., doi:10.1029/2011GL046866.

Shelly, D. R.  and J. L. Hardebeck (2010), Precise tremor source locations and amplitude variations along the lower-crustal central San Andreas Fault, Geophys. Res. Lett.,  37, L14301, doi:10.1029/2010GL043672.

Shelly, D. R. (2010), Periodic, chaotic, and doubled earthquake recurrence intervals on the deep San Andreas Fault, Science, 328, 1385-1388, doi:10.1126/science.1189741. [Full text] [PDF]

Shelly, D. R. (2010), Migrating tremors illuminate deformation beneath the seismogenic San Andreas fault, Nature, 463, 648-652. doi:10.1038/nature0875.

Peng, Z., D. P. Hill, D. R. Shelly and C. Aiken (2010), Remotely triggered microearthquakes and tremor in central California following the 2010 Mw 8.8 Chile earthquake, Geophys. Res. Lett., 37, L24312.

Rubinstein, J. R., D. R. Shelly, and W. L. Ellsworth (2010), Non-Volcanic Tremor: A Window into the Roots of Fault Zones, in New Frontiers in Integrated Solid Earth Sciences, Springer.

Ryberg, R., Ch. Haberland, G. S. Fuis, W. L. Ellsworth, and D. R. Shelly (2010), Locating non-volcanic tremor along the San Andreas Fault using a multiple array source imaging technique,Geophys. J. Int., 183, 1485-1500.

Shelly D. R. (2009), Possible deep fault slip preceding the 2004 Parkfield earthquake, inferred from detailed observations of tectonic tremor, Geophys. Res. Lett., 36, L17318, doi:10.1029/2009GL039589.

Shelly, D. R., W. L. Ellsworth, T. Ryberg, C. Haberland, G. S. Fuis, J. Murphy, R. M. Nadeau, and R. Bürgmann (2009), Precise location of San Andreas Fault tremors near Cholame, California using seismometer clusters: Slip on the deep extension of the fault?, Geophys. Res. Lett., 36, L01303, doi:10.1029/2008GL036367.

Brown, J. R., G. C. Beroza, S. Ide, K. Ohta, D. R. Shelly, S. Y. Schwartz, W. Rabbel, M. Thorwart, and H. Kao (2009), Deep low-frequency earthquakes in tremor localize to the plate interface in multiple subduction zones, Geophys. Res. Lett., doi:10.1029/2009GL040027.

Brown, J. R., G. C. Beroza, and D. R. Shelly (2008), An autocorrelation method to detect low frequency earthquakes within tremor, Geophys. Res. Lett., 35, L16305, doi:10.1029/2008GL034560.

Ide, S., K. Imanishi, Y. Yoshida, G. C. Beroza, and D. R. Shelly (2008), Bridging the gap between seismically and geodetically detected slow earthquakes, Geophys. Res. Lett., 35, L10305, doi:10.1029/2008GL034014.

Shelly, D. R., G. C. Beroza, and S. Ide (2007), Complex evolution of transient slip derived from precise tremor locations in western Shikoku, Japan, Geochem. Geophys. Geosyst., 8, Q10014, doi:10.1029/2007GC001640.

Shelly, D. R., G. C. Beroza, and S. Ide (2007), Non-Volcanic Tremor and Low Frequency Earthquake Swarms, Nature, 446, 305-307, doi:10.1038/nature05666

Ide, S., G. C. Beroza, D. R. Shelly, and T. Uchide (2007), A scaling law for slow earthquakes, Nature, 447, 76-79, doi:10.1038/nature05780.

Ide, S., D. R. Shelly, and G. C. Beroza (2007), Mechanism of deep low frequency earthquakes: Further evidence that deep non-volcanic tremor is generated by shear slip on the plate interface,Geophys. Res. Lett., 34, L03308, doi:10.1029/2006GL028890.

Shelly, D. R., G. C. Beroza, S. Ide, and S. Nakamula (2006), Low-frequency earthquakes in Shikoku, Japan and their relationship to episodic tremor and slip, Nature, 442, 188-191, doi:10.1038/nature04931.

Shelly, D. R., G.C. Beroza, H. Zhang, C.H. Thurber, S. Ide (2006), High-Resolution Subduction Zone Seismicity and Velocity Structure in Ibaraki, Japan, J. Geophys. Res., 111, B06311, doi:10.1029/2005JB004081.

Segall, P.,  E. K. Desmarais, D. R. Shelly, A. Miklius, and P. Cervelli (2006), Earthquakes triggered by silent slip events on Kilauea volcano, Hawaii, Nature, 442,  71-74, doi:10.1038/nature04938.

Zhang, H., C. H. Thurber, D. R. Shelly, S. Ide, G. C. Beroza, and A. Hasegawa (2004), High-resolution subducting slab structure beneath Northern Honshu, Japan, revealed by double-difference tomography, Geology, 32, 361-364, doi: 10.1130/G20261.2.