Tracy K.P. Gregg

PhD (she/her/hers)

Tracy K.P. Gregg.

Tracy K.P. Gregg

PhD (she/her/hers)

Tracy K.P. Gregg

PhD (she/her/hers)


Volcanology, mid-ocean ridge eruptions, basaltic lava flows, volcanoes on Mars and Venus


PhD, Geology, Arizona State University – 1995

Research Interests

Lava flows anywhere in the Solar System, including the East Pacific Rise, Juan de Fuca Ridge, Hawaii, Iceland, Mars, Io, and Venus.

Course Offerings

  • GLY 101 – Natural Hazards
  • GLY 206 – Geological Communications and Mapping
  • GLY 424/524 –  ET Volcanism (Extraterrestial Volcanism)
  • GLY 431/531 – Volcanology
  • GLY 454/554 – Topics in Planetary Geosciences
  • GLY 499 – Independent Study
  • GLY 599 – Supervised Teaching
  • GLY 633 – Graduate Research
  • GLY 700 – Thesis Guidance

Current Students

  • Brandy Buford – MS
  • Jeff Green – MS
  • Paul Moretti – MS
  • Elisabetta Panza – MS
  • Iana Shmelkina – MS
  • Christian Venturino – MS

Recent Former Students

  • Kenneth Cristle – MS (2012)
  • Daniel Krysak – MS
  • Trevelyn Lough – MS (2011) – Currently employed by Shannon & Wilson, Inc. as a Geologist.
  • Diana Miller – MS (2012)
  • David “Ash” Narkevic – MS (2014) – Thesis title: “Geometric analysis of surface features on Titan using terrestrial analogs.”
  • Andrew Rankin – MS (2012) – Thesis title: “Predicted ash hazards from Nevado Sabancaya, Peru, using HYSPLIT.”
  • Carolyn Roberts – MS (2014) – Thesis title: “On the formation of lunar sinuous rilles in the Marius Hills and Aristarchus
  • Plateau regions: morphometric and morphologic insights.”
  • Kelley Shockey – MS
  • Mickael Smolen – MS (2012) – Thesis title: “Pit crater information: laboratory simulations and applications to Mars.”

Recent Publications

Gregg, T.K.P., and K.W. Christle (2013), Non-explosive lava–water interaction in Skaelingar, Iceland and the formation of subaerial lava pillars. J. Volcanol. Geotherm. Res., 264:36–48.

Fagents, S.A., Gregg, T.K.P., and Lopes, R.M.C., eds. (2013) Modeling Volcanic Processes: The Physics and Mathematics of Volcanism. Cambridge University Press, New York, p. 421.

Colman, A., Colman, A., Sinton, J.M., White, S.M., McClinton, J.T., Bowles, J.A., Rubin, J.H., Behn, M.D., Cushman, B., Eason, D.E., Gregg, T.K.P., Grönvold, K., Hidalgo, S., Howell, J., Neill, O., and Russo, C. (2012), Effects of variable magma supply on mid-ocean ridge eruptions: Constraints from mapped lava flow fields along the Galápagos Spreading Center, Geochem. Geophys. Geosyst., 13, Q08014, doi:10.1029/2012GC004163.

Valentine, G.A. and Gregg, T.K.P. (2008) Continental basaltic volcanoes — Processes and problems. J. Volcanol. Geotherm. Res., 177(4): 857–873.

Gregg, T.K.P., R.M. Lopes (2008), Lava lakes on Io: New perspectives from modeling. Icarus, 194(1):166–172.

Gregg, T.K.P., J.P. Briner, K.N. Paris (2007), Ice-rich terrain in Gusev Crater, Mars? Icarus, 192(2): 348–360.

Williams, D.A., R. Greeley, W. Zuschneid, S. C. Werner, G. Neukum, D. A. Crown, T. K. P. Gregg, K. Gwinner, and J. Raitala (2007), Hadriaca Patera: Insights into its volcanic history from Mars Express High Resolution Stereo Camera, J. Geophys. Res., 112, E10004, doi:10.1029/2007JE002924.

Garry, W. B., J. R. Zimbelman, and T. K. P. Gregg (2007), Morphology and emplacement of a long channeled lava flow near Ascraeus Mons Volcano, Mars, J. Geophys. Res., 112, E08007, doi:10.1029/2006JE002803.

Gregg, T.K.P. and M.A. Farley (2006), Mafic pyroclastic flows at Tyrrhena Patera, Mars: Constraints from observations and models. J. Volcanol. Geotherm. Res., 155(1–2): 81–89.

Garry, W. B., T. K. P. Gregg, S. A. Soule, and D. J. Fornari (2006), Formation of submarine lava channel textures: Insights from laboratory simulations, J. Geophys. Res., 111, B03104, doi:10.1029/2005JB003796.

Goudy, C. L., R. A. Schultz, and T. K. P. Gregg (2005), Coulomb stress changes in Hesperia Planum, Mars, reveal regional thrust fault reactivation, J. Geophys. Res., 110, E10005, doi:10.1029/2004JE002293.

R. Lopes and T.K.P. Gregg, eds. (2004), Volcanic Worlds: Volcanism in the Solar System, Praxis Press, New York, 2004.

Gregg, T.K.P. and L.P. Keszthelyi (2004), The emplacement of pahoehoe toes: Field observations and comparison to laboratory simulations, Bull. Volcanol. 66:381-391.

Gregg, T.K.P. and D.K. Smith (2003), Volcanic investigations of the Puna Ridge, Hawai’i: Relations of lava flow morphologies and underlying slopes, J. Volcanol. Geotherm. Res. 126:63-77.

Warner, N.H. and T.K.P. Gregg (2002), Evolved Lavas on Mars? Observations from Southwest Arsia Mons and Sabancaya Volcano, Peru, J. Geophys. Res., 10.129/2002JE001969.

Parfitt, E.A., T.K.P. Gregg and D.K. Smith (2002), A comparison between subaerial and submarine eruptions at Kilauea Volcano, Hawaii: Implications for the thermal viability of lateral feeder dikes, J. Volcanol. Geotherm. Res. 113:213-242.

Sinton, J., E. Bergmanis, K. Rubin, R. Batiza, T.K.P. Gregg, K. Gronvold, K.C. Macdonald and S.M. White (2000), Volcanic eruptions on mid-ocean ridges: New evidence from the superfast spreading East Pacific Rise, 17°-19°S, J. Geophys. Res. 197:10.1029/2000JB000090.

J.R. Zimbelman and T.K.P. Gregg, eds. (2000), Environmental Effects on Volcanic Eruptions: From Deep Oceans to Deep Space, Kluwer Academic/Plenum Publishing, New York, pp. 260.