Lawrence Livermore National Laboratory

William Walter

Head, Geophysical Monitoring Programs
Seismology Group
Atmospheric, Earth and Energy Division

 +1 925-423-8777

Ph.D. Geophysics
Mackay School of Mines, University of Nevada, Reno
M.Sc. Physics
University of California at San Diego
B.A. Physics
Middlebury College

Research Interests

Seismology and geophysics, seismic source physics, earth structure and tectonics, treaty verification and related policy issues, broadband regional data analysis, inversion and forward techniques.

Selected Peer-Reviewed Publications

Zucca, J.J, W.R. Walter, A.J. Rodgers, P. Richards, M.E. Pasyanos, S.C. Myers, T. Lay, D. Harris, and T. Antoun, "The prospect of using three-dimensional Earth models to improve nuclear explosion monitoring and ground motion hazard assessment," Seism. Res. Lett., 80, doi:10.1785/gssrl.80.1.31, (2009).

Ford, S. R., D.S. Dreger, and W. R. Walter, "Identifying isotropic events using a regional moment tensor inversion", J. Geophys. Res., 114 B01306, doi:10.1029/2008JB005743, (2009).

Murphy, K. R., K. Mayeda, and W. R. Walter, "Lg-coda methods applied to Nevada Test Site events: spectral peaking and yield estimation", Bull. Seism. Soc. Am., 99, 441-448, doi:10.1785/0120080046, (2009).

Ford, S. R., D.S. Dreger, and W. R. Walter, "Source Characterization of the August 6, 2007 Crandall Canyon Mine Seismic Event in Central Utah", Seism. Res. Lett., 79, 637-644, (2008).

Ford, S. R. D. S. Dreger, K. Mayeda, W. R. Walter, L. Malagnini, and W. S. Phillips, "Regional Attenuation in Northern California: A Comparison of Five 1-D Q Methods", Bull. Seis. Soc. Am., 4, 2033-2046, (2008).

Dreger, D. S., S. R. Ford, and W. R. Walter, "Source Analysis of the Crandall Canyon, Utah, Mine Collapse", Brevia in Science, 321, 217, (2008).

Mayeda, K., L. Malagnini, and W. R. Walter, "A new spectral ratio method using narrow band coda envelopes: Evidence for non-self-similarity in the Hector Mine sequence", Geophys. Res. Lett., 34, L11303, doi:10.1029/2007GL030041, (2007).

Walter, W. R., K. Mayeda, L. Malagnini, and L. Scognamiglio, "Regional body-wave attenuation using a coda source normalization method: application to MEDNET records of earthquakes in Italy", Geophys. Res. Lett., 34, L10308, doi:10.1029/2007GL029990, (2007).

Walter, W. R., K. Mayeda, R. Gok and A. Hofstetter. "The scaling of seismic energy with moment: simple models compared with observations", in "Earthquakes: Radiated Energy and the Physics of Faulting" American Geophysical Union Monograph 170, doi:10.1029/170GM05, 25-41, (2006).

Pasyanos, M. E., W. R. Walter, M. P. Flanagan, P. Goldstein, and J. Bhattacharyya, "Building and testing an a Priori geophysical model for Western Eurasia and North Africa", Pure Appl. Geophys., 161, 235-281, (2004).

Vincent, P., S. Larsen, D. Galloway, R. J. Laczniak, W. R. Walter, W. Foxall, and J. J. Zucca, "New signatures of underground nuclear tests revealed by satellite radar interferometry", Geophys. Res. Lett., Vol. 30, No. 22, doi:10.1029/2003GL018179, (2003).

Mayeda, K., A. Hofstetter, J. L. O'Boyle and W. R. Walter, "Stable and transportable regional coda magnitudes based on coda-derived moment rate spectra", Bull. Seism. Soc. Am. 93, 224-239, (2003).

Rodgers, A. J. and W. R. Walter, "Seismic discrimination of the May 11, 1998 Indian nuclear test with short-period regional data from station NIL (Nilore, Pakistan)", Pure Appl. Geophys., 159, 679-700, (2002).

Bowers, D. and W. R. Walter, "Discriminating between large mine collapses and explosions using teleseismic P-waves", Pure Appl. Geophys., 159, 803-830, (2002).

Myers, S. C., W. R. Walter, K. Mayeda and L. Glenn, "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. Seism. Soc. Am. 89, 544-549, (1999).

Mayeda, K. M. and W. R. Walter, "Moment, energy, stress drop and source spectra of Western U.S. earthquakes from regional coda envelopes," J. Geophys. Res. 101, 11,195-11,208, (1996).

Walter, W. R., K. M. Mayeda and H. J. Patton, "Phase and spectral ratio discrimination between NTS earthquakes and explosions, part I: empirical observations", Bull. Seism. Soc. Am. 85, 1050-1067, (1995).

Walter, W. R., "Source parameters of the June 29, 1992 Little Skull Mountain earthquake from complete regional waveforms at a single station", Geophys. Res. Lett., 20, 403-406, (1993).

Walter, W. R. and J. N. Brune, "The spectra of seismic radiation from a tensile crack", J. of Geophys. Res., 98, 4449-4459, (1993).

Walter, W. R., and H. J. Patton, "Tectonic release from the Soviet joint verification experiment", Geophys. Res. Lett., 17, 1517-1520, (1990).

Last update: