Guy Masters

Professor/Researcher

Room: Munk Lab 327

Institute of Geophysics and Planetary Physics,
Scripps Institution of Oceanography,
University of California San Diego,
La Jolla, CA 92093-0225, USA.

Telephone: (858) 534-4122

Email: tmasters@ucsd.edu

Website: http://mahi.ucsd.edu/Guy/index.html

Research Interests:

• Development of reference Earth models and the integration of mineral physics, geodynamics, and geochemistry into Earth models
• The study the fine structure of the earth and the 3-D structure of the mantle and core using body waves, surface waves, and free oscillations

Courses Taught:

• ERTH103 (Introduction to Geophysics)
• ERTH199 (Independent Study)
• ERTH211 (Research Seminar)
• ERTH90 (Undergraduate Seminar)
• PHYS199H (Honors Thesis Rsrch/Undergrads)
• SIO103 (Introduction to Geophysics)
• SIO199 (Special Studies)
• SIO224 (Internal Constitution/Earth)
• SIO227B (Advanced Seismology I)
• SIO299 (Research)

Recent publications: ^†

• Schulte-Pelkum, V., G. Masters, and P. Shearer, 2001, Upper mantle anisotropy from long-period P polarization, J. Geophys. Res., 106, 21,917--21,934
• Schubert, G., G. Masters, P.Olson, and P. Tackley, 2004 Superplumes or plume clusters? Phys. Earth Planet. Int., 146, 147--162
• Mooney, W.D., G. Laske, and G. Masters, 1998,CRUST 5.1: A global crustal model at 5 X 5 degrees, J. Geophys. Res., 103, 727--747
• Montelli, R., G. Nolet, F.A. Dahlen, and G. Masters, 2006, A catalogue of deep mantle plumes: New results from finite frequency tomography. Geochem. Geophys. Geosyst. 7, 11, Q11007
• Montelli, R, G. Nolet, G. Masters, F.A. Daheln, and S-H Hung, 2004 Global P and PP traveltime tomography: rays versus waves. Geophys. J. Int., 158, 637--654.
• Montelli, R, G. Nolet, F.A. Daheln, G. Masters, E.E. Engdahl, and S-H Hung, 2004. Finite-frequency tomography reveals a variety of plumes in the mantle Science, 303, 338--343
• Masters, G., G. Laske, H. Bolton, and A. Dziewonski, 2000, The relative behavior of shear velocity, bulk sound speed, and compressional velocity in the mantle: implications for chemical and thermal structure, in: Earth's deep interior, AGU Monograph 117, Ed S. Karato, 63--87
• Masters, G., G. Laske, and F. Gilbert, 2000, Matrix autoregressive analysis of free oscillation splitting and coupling, Geophys. J. Int., 143, 478--489
• Masters, G., G. Laske, and F. Gilbert, 2000, Autoregressive estimation of the splitting matrix of free oscillation multiplets, Geophys. J. Int., 141,25--42
• Masters, G., and K. Richards-Dinger, 1998, On the efficient calculation of ordinary and generalized spherical harmonics, Geophys. J. Int., 135, 307--309
• Masters, G., and D. Gubbins, 2003 On the resolution of density within the Earth Phys. Earth Planet. Int., 140, 159--167
• Masters, G., and A.M. Dziewonski, 1997, Mantle and core studies, Geotimes, 42, 59--60
• Masters, G., 2007, Core density. In: Encyclopedia of geomagnetism and paleomagnetism, eds D. Gubbins, E. Herrero-Bervera, Springer, Netherlands, 82--84
• Masters, G., 2000 SSA medal citation for Adam Dziewonski, Seis. Res. Lett, 71, 457--458
• Masters, G., 1997, Tracking slabs in the lower mantle, Nature, 386, 558
• Masters, G., 1997, Hess medal citation for Tom Ahrens, EOS Trans. AGU, 78, 319
• Masters, G. G. Laske, and F. Gilbert, 2000, Large-scale Earth Structure from Analysis of Free Oscillaion Splitting and Coupling. In: Problems in geophysics in the new milleniuem, eds E. Boschi, G. Ekstrom, A. Morelli, Edirice Compositori, pp 63--87
• Manners, U., Q. Liu, G, Masters, and J. Tromp, 2009, Modeling the lowermost mantle using diffracted phases and finite frequency kernels, Geophys. J. Int., submitted.
• Manners, U., and G. Masters, 2009, Relations between shear velocity and bulk sound speed in the lower mantle, Geophys. J. Int., submitted.
• Manners, U., and G. Masters, 2009, Analysis of core-mantle boundary structure using S and P diffracted waves, Geophys. J. Int., submitted.
• Manners, U., and G. Masters, 2009, A comparison of methods for global teleseismic earthquake relocation, Bull.Seism. Soc. Am., submitted.
• Lawrence, J., P. Shearer, and G. Masters, 2006, Mapping attenuation beneath North America using waveform cross-correlation and cluster analysis, Geophys. Res. Lett, 33, 7, L07315
• Laske, G., and G. Masters, 2003 The Earth's free oscillations and the differential rotation of the inner core, In: Earth's Core,: Dynamics, Structure, Rotation; eds Dehant et al., Geodynamics series 31, AGU
• Laske, G., and G. Masters, 1999, Limits on differential rotation of the inner core from an analysis of the Earth's free oscillations, Nature, 402, 66--69
• Laske, G., and G. Masters, 1998, Surface-wave polarization data and global anisotopic structure, Geophys. J. Int., 132, 508--520
• Laske, G., and G. Masters, 1997 (electronic) A global digital map of sediment thickness, http://mahi.ucsd.edu/Gabi/sediment.html
• Houser, C., G. Masters, P.Shearer, and G.Laske, 2008, Shear and compressional models of the mantle from cluster analysis of long-period waveforms, Geophys. J. Int., 174, doi: 10.1111/j.1365-246X.2008.03763.x
• Houser, C., G. Masters, M. Flanagan, and P.Shearer, 2008, Determination and analysis of long-wavelength transition zone structure using SS precursors, Geophys. J. Int., 174, doi: 10.1111/j.1365-246X.2008.03879.x
• Gubbins, D., G. Masters and F. Nimmo, 2008, A thermochemical boundary layer at the base of Earth's outer core and independent estimate of core heat flux, Geophys. J. Int., 174, doi: 10.1111/j.1365-246X.2008.03719.x
• Gubbins, D., D.Alfe, G. Masters, D,G, Price, and M.J. Gillan, 2004 Gross thermodynamics of two-component core convection. Geophys. J. Int., 157, 1407--1414.
• Gubbins, D., D.Alfe, G. Masters, D,G, Price, and M.J. Gillan, 2003 Can the Earth's dynamo run on heat alone? Geophys. J. Int., 155, 609--622.
• Davis, P., M. Ishii, and G. Masters, 2005, An assessment of the accuracy of GSN sensor response information, Seis. Res. Lett, 76, 678--683.
• Bolton, H., and G. Masters, 2001, Travel times of P and S from the global digital networks: implications for the relative variation of P and S in the mantle. J. Geophys. Res., 106, 13,527--13,540.