Stephen C Myers

Staff Scientist
Atmospheric, Earth, and Energy Division
Email: smyers@llnl.gov
Phone: +19254234988

Dr. Myers is the program manager for Geophysical Monitoring Programs.

Dr. Myers's research focuses on nuclear explosion monitoring with emphasis on technologies that improve the accuracy of event locations and characterization of uncertainty. Dr. Myers led development of the BayesLoc method for simultaneous relocation of many seismic events and assessment of data quality. He also leads the multi-national-laboratory Regional Seismic Travel Time (RSTT) effort which accounts for the effects of Earth heterogeneity in a method that is computationally efficient enough for use in real-time operational systems.  Machine learning is currently being explored as a new way to achieve higher prediction fidelity in a computationally efficient algorithm. In additional to these contributions to nuclear non-proliferation, Dr. Myers maintains an interest in basic Earth science, particularly regional and whole-Earth structure.

Honors, Awards, Service

2019 Served on the TexNET expert panel

2018 DOE Secretary’s Appreciation Award for Source Physics Experiment.

2017 Invited Panel Discussion Member at the CTBTO SnT2017, Vienna Austria

2017 LLNL-PLS Directorate Award for contributions to CTBT day on the hill event, November 2017 Washington D.C.

2013-2017 Served on the LLNL Lawrence Fellowship Committee

2014 Department of Energy E. O. Lawrence Award for contributions to nuclear security and nuclear non-proliferation technology.

2012-present Chair: IASPEI/CoSOI1 working group on Utilization of Global 3-D Models for Seismic Observatory Applications.

2010 LLNL SPOT award for leading the joint LLNL, SNL, LANL, AFTAC team to develop, deliver, and publish on the Regional Seismic Travel Time (RSTT) method and model.

2006 LLNL directorate award for outstanding contribution to an external review panel.

1International Association of Seismology and Physics of the Earth's Interior/ Commission on Seismological Observation and Interpretation

 

Selected Publications

Simmons, N.A., B.S.A. Schuberth, S.C. Myers, D.R. Knapp (2019), Resolution and covariance of the LLNL-G3D-JPS global seismic tomography model: applications to travel time uncertainty and tomographic filtering of geodynamic models, Geophys. Jour. Int. doi: 10.1093/gji/ggz102.

Myers, S.C., S.R. Ford, R.J. Mellors, S. Baker, and G.A. Ichinose (2018), Absolute locations of the North Korean nuclear tests based on differential seismic arrival times and InSAR, Seism. Res. Lett., Vol. 89 doi: 10.1785/0220180123.

Pasyanos, M.E. and S.C. Myers (2018), The Coupled Location/Depth/Yield Problem for North Korea's Declared Nuclear Tests, Seism. Res. Lett., Vol. 89 doi: 10.1785/0220180109 (submitted 13 April 2018, accepted 3 July 2018, published 8 August 2018)

Ichinose, G.A., S.C. Myers, S.R. Ford, M.E. Pasyanos, and W.R. Walter (2017). Relative Surface-wave Amplitude and Phase Anomalies from the Democratic People's Republic Korea Announced Nuclear Tests, Geophys. Res. Let., 44, 8857-8864, doi: 10.1002/2017GL074577

Simmons, N. A., S. C. Myers, G. Johannesson, E. Matzel, and S. P. Grand (2015), Evidence for long-lived subduction of an ancient tectonic plate beneath the southern Indian Ocean, Geophys. Res. Lett., 42, doi:10.10022015GL066237.

Myers, S.C., N. A. Simmons, G. Johanesson, and E. Matzel (2015), Improved regional and teleseismic P-wave travel time prediction and event location using a global, 3-dimensional velocity model, Bull. Seismol. Soc. Am., 105, 3, doi: 10.1785/0120140272.

Bondar, I., S.C. Myers, E.R. Engdahl (2014), Earthquake Location, Encyclopedia of Earthquake Engineering, ed. M. Beer, E. Patelli, I. Kougioumtzoglou, and I Siu-Kui In: Encyclopedia of Earthquake Engineering. Springer Verlag, Berlin, pp. 1-18.

Rodi, W.L., and S.C. Myers (2013), Computation of traveltime covariances based on stochastic models of velocity heterogeneity, Geophys. Jour. Int, doi: 10.1093/gji/ggt171.

Simmons, N.A, S.C. Myers, G. Johannesson, and E. Matzel (2012), LLNL-G3Dv3: Global P-wave tomography model for improved regional and teleseismic travel time prediction. Jour, Geophys. Res., doi:10.1029/2012JB009525.

Myers, S.C., G. Johannesson, and W. Hanley (2009), Incorporation of probabilistic seismic phase labels into a Bayesian multiple-event seismic locator, Geophys. J. Int., 177, 193-204.

Myers, S.C., G. Johannesson, and W. Hanley (2007), A Bayesian hierarchical method for multiple-event seismic location, Geophys. J. Int., 171, 1049-1063,

Bondar, I., S.C. Myers, E.R. Engdahl, E.A. Bergman (204), Epicenter accuracy based on seismic network criteria, Geophys. Jour. Int., 156, 483–496.

Myers, S.C., W.R. Walter, K. Mayeda, L. Glenn (1999), Observations in support of Rg scattering as a source for explosion S waves: regional and local recordings of the 1997 Kazakhstan depth of burial experiment, Bull. Seismol. Soc. Am., 89, 544-549.

Myers S.C., S.L. Beck, G. Zandt, T.C. Wallace (1998), Lithospheric-scale structure across the Bolivian Andes from tomographic images of velocity and attenuation for P and S waves, J. Geophys. Res., 103, 21,233-21,252

Zandt, G., S. C. Myers, T. C. Wallace (1995), Crust and mantle structure across the Basin and Range - Colorado Plateau boundary at 37°N Latitude and implications for Cenozoic extensional mechanism, Jour. Geophys. Res., 100, 10,529-10,548