NASA Logo Jet Propulsion Laboratory California Institute of Technology View the NASA Portal
NASA Banner
NASA Banner
NASA Banner
NASA Banner
JPL Science
JPL Science Division Home
Planetary Science Planetary Science
Planetary And Exoplanetary Atmospheres (3222)
Geophysics & Planetary Geosciences (3223)
Asteroids, Comets & Satellites (3224)
Planetary Chemistry and Astrobiology (3225)
Planetary Ices (3227)
Astrophysics & Space Sciences Astrophysics & Space Sciences
Earth Science Earth Science
Directorate Science Affiliates Directorate Science Affiliates
Open Postdoc Positions Open Postdoc Positions
Brochures Brochures
 Asteroids, Comets & Satellites (3224): People
Bruce  Bills's Picture
Jet Propulsion Laboratory
M/S 183-301
4800 Oak Grove Drive
Pasadena, CA 91109
818 393-6307
818 393-4445
Email Contact:
Curriculum Vitae:

Bruce Bills

  • Ph.D., California Institute of Technology, Planetary Science / Geophysics, (1978)
  • B.S., Brigham Young University, Mathematics / Physics, (1973)

Professional Experience
  • Jet Propulsion Laboratory, Pasadena, California, (2008-present)
  • Visiting Research Geophysicist, Scripps Institution of Oceanography, La Jolla, California, (1998-present)
  • Geophysicist, Geodynamics Branch, Goddard Space Flight Center, Greenbelt, Maryland, (1990-2008)
  • Adjunct Professor, Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland, (1991-1998)
  • Staff Scientist, Lunar and Planetary Institute, Houston, Texas, (1984-1990)
  • Jet Propulsion Laboratory, Pasadena, California, (1977-1984)
    • Senior Scientist, Planetary Radar Group, Earth and Space Sciences Division, (1983-1984)
    • Senior Scientist, Planetary Dynamics and Geophysics Group, Earth and Space Sciences Division, (1979-1983)
    • Senior Engineer, Tracking and Orbit Determination Group, Systems Division, (1977-1979)

Selected Awards
  • NASA Group Achievement Award, Dawn Science Team (2013)

Selected Publications
  1. McNamara, D.H., and B.G. Bills (1973), Photometric and spectrographic observations of HR6684, Pub. Astron. Soc. Pac., 85, 632-636.
  2. Bills, B.G. , and A.J. Ferrari (1977), A harmonic analysis of lunar topography, Icarus, 31, 244-259.
  3. Bills, B.G. , and A.J. Ferrari (1977), A lunar density model consistent with topographic, gravitational, librational and seismic data, J. Geophys. Res., 82, 1306-1314.
  4. Bills, B.G. , and A.J. Ferrari (1978), Mars topography harmonics and geophysical implications, J. Geophys. Res., 83, 3497-3508.
  5. Ferrari, A.J., and B.G. Bills (1979), Planetary geodesy, Rev. Geophys. Space Phys., 17, 1663-1677.
  6. Bills, B.G. , and A.J. Ferrari (1980), A harmonic analysis of lunar gravity, J. Geophys. Res., 85, 1013-1025.
  7. Ananda, M.P., W.L. Sjogren, R.J. Phillips, and B.G. Bills (1980), A low-order global gravity field of Venus and dynamical implications, J. Geophys. Res., 85, 8303-8318.
  8. Esposito, P.B., W.L. Sjogren, N.A. Mottinger, B.G. Bills, and E. Abbott (1982), Venus gravity: Analysis of Beta Regio, Icarus, 51, 448-459.
  9. Bills, B.G. (1983), Thermoelastic bending of the lithosphere, Geophys. J. Roy. Astr. Soc. , 75, 169-200.
  10. Sjogren, W.L., B.G. Bills, P.W. Birkeland, P.W. Esposito, A.R. Konopliv, N.A. Mottinger, S.J. Ritke, and R.J. Phillips (1983), Venus gravity anomalies and their correlation with topography, J. Geophys. Res. , 88, 1119-1128.
  11. Reasenberg, R.D., and B.G. Bills (1983), Critique of "Elastic thickness of the Venus lithosphere estimated from topography and gravity", Geophys. Res. Lett. , 10, 93-96.
  12. Sjogren, W.L., B.G. Bills, and N.A. Mottinger (1984), Venus: Ishtar gravity anomaly, Geophys. Res. Lett. , 11, 489-491.
  13. Bills, B.G. , and M. Kobrick (1985), Venus topography: A harmonic analysis, J. Geophys. Res. , 90, 827-836.
  14. Mottinger, N.A., W.L. Sjogren, and B.G. Bills (1985), Venus gravity: A harmonic analysis and geophysical implications, J. Geophys. Res. , 90, C739-C756.
  15. Kiefer, W.S., M.A. Richards, B.H. Hager, and B.G. Bills (1986), A dynamic model of Venus's gravity field, Geophys. Res. Lett. , 13, 14-17.
  16. Nakamura, Y., J. Oberst, S.M. Clifford, and B.G. Bills (1986), Comments on the letter "On the influx of small comets into the Earth's upper atmosphere", Geophys. Res. Lett. , 13, 1184-1185.
  17. Bills, B.G. , and S.P. Synnott (1987), Planetary geodesy, Rev. Geophys. , 25, 833-839.
  18. Bills, B.G. , W.S. Kiefer, and R.L. Jones (1987), Venus gravity: A harmonic analysis, J. Geophys. Res. , 92, 10,335-10,351.
  19. Bills, B.G. , and G.M. May (1987), Lake Bonneville: Constraints on lithospheric thickness and upper mantle viscosity from isostatic warping of shorelines, J. Geophys. Res. , 92, 11,493-11,508.
  20. Herrick, R.R., B.G. Bills, and S.A. Hall (1989), Variations in effective compensation depth across Aphrodite Terra, Venus, Geophys. Res. Lett. , 16, 543-546.
  21. Bills, B.G. (1989), The moments of inertia of Mars, Geophys. Res. Lett. , 16, 385-388.
  22. Bills, B.G. (1989), Planetary geodesy, in The Encyclopedia of Solid Earth Geophysics, edited by D.E. James, Van Nostrand Reinhold, pp. 931-938.
  23. Bills, B.G. (1989), Comment on "More about the moment of inertia of Mars", Geophys. Res. Lett. , 11, 1337-1338.
  24. Bills, B.G. (1990), Geodetic constraints on the composition of Mars, J. Geophys. Res. , 95, 14,131-14,136.
  25. Bills, B.G. (1990), The rigid body obliquity history of Mars, J. Geophys. Res. , 95, 14,137-14,153.
  26. May, G.M., B.G. Bills, and D.S. Hodge (1991), Far-field flexural response of Lake Bonneville from paleopluvial lake elevations, Phys. Earth Planet. Inter. , 68, 274-284.
  27. Bills, B.G. (1992), Venus: Satellite orbital decay, ephemeral ring formation, and subsequent crater production, Geophys. Res. Lett. , 19, 1025-1028.
  28. Dixon, T.H., and B.G. Bills (1992), What is DOSE? Eos Trans. Amer. Geophys. Union, 73, 276-277.
  29. Esposito, P.B., W.B. Banerdt, G.F. Lindal, W.L. Sjogren, M.A. Slade, B.G. Bills, D.E. Smith, and G. Balmino, Gravity and topography, in Mars, edited by H.H. Kiefer, B.M. Jakosky, C.W. Snyder and M.S. Mathews, University of Arizona Press, pp. 209-248.
  30. Bills, B.G. , and M.A. Fischer (1992), A spatial domain Stokes flow model for the gravity and topography of the middle latitudes of Venus, J. Geophys. Res., 97, 18,285-18,294.
  31. Bills, B.G. (1993), Geodynamic contributions to global climatic change, in Orbital, Rotational and Climatic Interactions, NASA Conf. Publ. 3815, pp. 1-33.
  32. Nerem, R.S., B.G. Bills, and J.B. McNamee (1993), A high resolution gravity model for Venus: GVM-1, Geophys. Res. Lett. , 20, 599-602.
  33. Bills, B.G. (1994), Obliquity-oblateness feedback: Are climatically sensitive values of obliquity dynamically unstable? Geophys. Res. Lett. , 21, 177-180.
  34. Bills, B.G. , S.L. de Silva, D.R. Currey, R.S. Emenger, K. Lillquist, A. Donnellan, and B. Worden (1994), Hydro-isostatic deflection and tectonic tilting in the Central Andes: Initial results of a GPS survey of Lake Minchin shorelines, Geophys. Res. Lett. , 21, 293-296.
  35. Bills, B.G. , D.R. Currey, and G.A. Marshall (1994), Viscosity estimates for the crust and upper mantle from patterns of lacustrine shoreline deformation in the eastern Great Basin, J. Geophys. Res. , 99, 22,059-22,086.
  36. Bills, B.G. , and R.R. Nerem (1995), A harmonic analysis of Martian topography, J. Geophys. Res. 100, 26,317-26,326.
  37. Bills, B.G., and D.P. Rubincam (1995), Constraints on density models from radial moments: Application to the Earth, Moon and Mars, J. Geophys. Res. 100, 26,305-26,315.
  38. Bills, B.G. (1995), Discrepant estimates of the moments of inertia of the Moon, J. Geophys. Res. 100, 26,297-26,303.
  39. Bills, B.G. , and F.G. Lemoine (1995), Gravitational and topographic isotropy of the Earth, Moon, Mars and Venus, J. Geophys. Res. 100, 26,275-26,295.
  40. Kiefer, W.S., B.G. Bills, and R.S. Nerem (1996), An inversion of gravity and topography for mantle and crustal structure on Mars, J. Geophys. Res., 101, 9239-9252.
  41. Frey, H.V., B.G. Bills, R.S. Nerem, and J.H. Roark (1996), The isostatic state of Martian topography revisited, Geophys. Res. Lett. 23, 721-724.
  42. Bills, B.G. , and T.S. James (1996), Late Quaternary variations in relative sea level due to glacial cycle polar wander, Geophys. Res. Lett. 23, 3023-3026.
  43. Shirron, P.J, M.J DiPirro, S.H. Castles, B.G. Bills, H.J Paik, E.R. Canavan and M.V. Moody (1996), Mission concepts for the Superconducting Gravity Gradiometer, Cryogenics, 36, 805-813.
  44. Folkner, W.M., R.D. Kahn, R.A. Preston, C.F. Yoder, C.D. Edwards, R. Hellings, E. M. Standish, M. Eubanks, and B.G. Bills (1997), Mars dynamics from Earth-based tracking of the Mars Pathfinder Lander, J. Geophys. Res. 102, 4057-4064.
  45. Bills, B.G. , and T.S. James (1997), Polar motion of a viscoelastic Earth due to glacial cycle mass loading, J. Geophys. Res. 102, 7579-7602.
  46. Tackman, G.E., D.R. Currey, B.G. Bills, and T.S. James (1998), Paleoshoreline evidence for postglacial tilting in Southern Manitoba, J. Paleolimnology, 19, 343 363.
  47. Bills, B.G. , and T.S. James (1999), Moments of inertia and rotational stability of Mars: Lithospheric support of sub-hydrostatic rotational flattening, J. Geophys. Res.104, 9081-9096.
  48. Bills, B.G. (1999), Tidal despinning of the mantle, inner core super-rotation, and outer core effective viscosity, J. Geophys. Res. 104, 2653-2666.
  49. Bills, B.G. , J.G. Mengel, and T.S. James (1999), Climatic impact of glacial cycle polar motion: Coupled oscillations of ice sheet mass and rotation pole position, J. Geophys. Res., 104, 1059-1075.
  50. Tackman, G.E., B.G. Bills, T.S. James, and D.R. Currey (1999), Lake gauge evidence for regional postglacial tilting in Southern Manitoba , Geol. Soc. Amer. Bull. 111, 1684-1699.
  51. Adams, K.D., S.G. Wesnousky, and B.G. Bills (1999), Isostatic rebound, active faulting, and potential geomorphic effects, in the Lake Lahontan Basin, Nevada and California, Geol. Soc. Amer. Bull. 111, 1739-1756.
  52. Ray, R.D., B.G. Bills, and B.F. Chao (1999), Lunar and solar torques on the oceanic tides, J. Geophys. Res. 104, 17,653-17,659.
  53. Bills, B.G. (1999), Obliquity-oblateness feedback on Mars, J. Geophys. Res. 104, 30,773-30,798.
  54. Bills, B.G. , and R.D. Ray (1999), Lunar orbital evolution: Synthesis of recent results, Geophys. Res. Lett. 26, 3045-3048.
  55. Clifford, S.M., D. Crisp. D., Fisher, D. Crisp, D.A. Fisher, K.E. Herkenhoff, S.E. Smrekar, P.C. Thomas, D.D. Wynn-Williams, R.W. Zurek, J.R. Barnes, B.G. Bills, E.W. Blake, W.M. Calvin, J.M. Cameron, M.H. Carr, P.R. Christensen, B.C. Clark, G.D. Clow, J.A. Cutts, D. Dahl-Jensen, W.B. Durham, F.P. Fanale, J.D. Farmer, F. Forget, K. Gotto-Azuma, R. Grard, R.M. Haberle, W. Harrison, R. Harvey, A.D. Howard, A.P. Ingersoll, P.B. James, J.S. Kargel, H.H. Kieffer, J. Larsen, K. Lepper, M.C. Malin, D.J. McCleese, B. Murray, J.F. Nye, D.A. Paige, S.R. Platt, J.J. Plaut, N. Reeh, J.W. Rice, D.E. Smith, C.R. Stoker, K.L. Tanaka, E. Mosley-Thompson, T. Thorsteinsson, S.E. Wood, A. Zent, M.T. Zuber, and H.J. Zwally (2000), The state and future of Mars polar science and exploration, Icarus, 144, 210-242.
  56. Bills, B.G. , and R.D. Ray (2000), Galilean satellite obliquities, J. Geophys. Res. , 105, 29.277-29,282.
  57. Bills, B.G. , and R.S. Nerem (2001), Mars topography: Lessons learned from spatial and spectral domain comparisons of Mars Orbiter Laser Altimeter and U.S. Geological Survey data, J. Geophys. Res. , 106, 32,915-32,925.
  58. Bills, B.G. , T.J. Wambeam, and D.R. Currey (2002) , Geodynamics of Lake Bonneville, in Great Salt Lake: An overview of change, ed. J. Wallace Gwynn, Utah Geol. Survey, pp. 7-32.
  59. Comstock, R.L., and B.G. Bills (2003), A solar system survey of forced librations in longitude, J. Geophys. Res. Planets, 108, 5100.
  60. Egbert, G.D., R.D. Ray, and B.G. Bills (2004), Numerical modeling of the global semidiurnal tide in the present day and in the last glacial maximum, J. Geophys. Res. Oceans, 109, C03003.
  61. B.G. Bills (2005), Free and forced obliquities of the Galilean satellites of Jupiter, Icarus, 175, 233-247.
  62. B.G. Bills and R.L. Comstock (2005), Spatial and temporal patterns of solar eclipses by Phobos on Mars, J. Geophys. Res. Planets, 110, E04004.
  63. B.G. Bills and R.L. Comstock (2005), Forced obliquity variations of Mercury, J. Geophys. Res. Planets, 110, E04006.
  64. Bills, B.G. , G.A. Neumann, D.E. Smith, and M.T. Zuber (2005), Improved estimate of tidal dissipation within Mars from MOLA observations of the shadow of Phobos, J. Geophys. Res. Planets, 110, E07004.
  65. Munk, W.H., and B.G. Bills (2007), Tides and the climate: some speculations, J. Phys. Ocean. 37, 135-147 .
  66. Fricker, H.A., A.A. Borsa, J.B. Minster, C. Carabajal, K. Quinn, and B.G. Bills (2005), Assessment of ICESat performance at the salar de Uyuni, Bolivia, Geophys. Res. Lett. 32, L21S06.
  67. Bills, B.G. , (2005), Variations in the rotation rate of Venus due to orbital eccentricity modulation of solar tidal torques, J. Geophys. Res. Planets, 110, E11007.
  68. Bills, B.G. , K.D. Adams, and S.G. Wesnousky (2007), Viscosity structure of the crust and upper mantle in western Nevada from isostatic rebound patterns of Lake Lahontan shorelines, J.Geophys. Res. , 112, B06405.
  69. Bills, B.G. , A.A. Borsa, and R.L. Comstock (2007), MISR-based passive optical bathymetry from orbit with cm-level accuracy on the salar de Uyuni, Bolivia, Remote. Sens. Environ., 107, 240-255.
  70. Borsa, A.A., J-B Minster, B.G. Bills, and H A. Fricker (2007), Modeling long-period noise in kinematic GPS applications, J. Geodesy, 81, 157-170.
  71. Borsa, A., H.A. Fricker, B.G. Bills, J-B, Minster, C. Carabajol, and K. Quinn (2008), Topography of the salar de Uyuni, Bolivia from kinematic GPS, Geophys. J. Int. , 172, 31-40.
  72. Luttrell, K., D Sandwell, B. Smith-Konter, B.G. Bills, and Y. Bock (2007), Modulation of the earthquake cycle at the southern San Andreas fault by lake loading , J. Geophys. Res. , 112, B08411.
  73. Bulow, R.C., C.L. Johnson, B.G. Bills, and P.M. Shearer (2007), Temporal and spatial properties of some deep Moonquake clusters, J. Geophys. Res. , 112, E09003.
  74. Hurford, TA., P. Helfenstein, G.V. Hoppa, R. Greenberg, and, B.G. Bills (2007), Eruptions arising from tidally controlled periodic openings of rifts on Enceladus, Nature, 447, 292-294.
  75. B.G. Bills, and F. Nimmo (2008), Forced obliquity and moments of inertia of Titan, Icarus, 196, 293-297.
  76. Borsa, A.A., B.G. Bills, and J.B. Minster (2008), Modeling the topography of the salar de Uyuni, Bolivia, as an equipotential surface of Earth's gravity field, J. Geophys. Res. , B10408.
  77. B.G. Bills (2009), Tidal flows in satellite oceans, Nature Geoscience, 2, 13-14.
  78. Hurford, T.A., A.R. Sarid, R. Greenberg, and B.G. Bills (2009), The influence of obliquity on Europan cycloid formation, Icarus, in press.
  79. Hurford, T.A., B.G. Bills, P. Helfenstein, R. Greenberg, G.V. Hoppa, and D.P. Hamilton (2009), Geological implications of a physical libration on Enceladus, Icarus, in press.
  80. Bills, B.G. , F. Nimmo, O. Karatekin, T. Van Hoolst, N. Rambaux, B. Levrard, and J. Laskar (2009), Rotational dynamics of Europa, in Europa, eds. R. Pappalardo, W. McKinnon, and K. Khurana, Univ. Arizona Press.
  81. Weber, R.C., B.G. Bills, and C.L. Johnson, (2009), Constraints on deep moonquake focal mechanisms through analysis of tidal stress, J. Geophys. Res. , in press.

Group Home Page
People in this Group
Group Projects

JPL Privacy Statement Sitemap Contact Site Manager