Astrogeology Science Center


  • The University of Texas at Austin
    • 1987 B.S., Mathematics, Summa Cum Laude
    • 1988 B.S. with Honors, Geophysical Sciences (Geophysics Option), Summa Cum Laude
  • California Institute of Technology
    • 1993 M.S., Planetary Science
    • 1994 Ph.D., Geology, Thesis: On the Thermal Budget of Panhoehoe Lava Flows, Advisor: Bruce C. Murray
  • NSF Earth Sciences Postdoctroal Fellow
    • 1994 - 1996 University of Hawai'i at Manoa and U.S. Geological Survey Hawai'ian Volcano Observatory. Supervisor: Stephen Self


Employment History

  • 2003-present Research Geologist, Astrogeology Program, U.S. Geological Survey. Studying volcanism on Io, Mars, and the Earth with an emphasis on field experiments to constrain numerical models that can be used to interpret remote sensing data. Member of the HiRISE science team.
  • 2001-2003 Senior Research Associate Lunar and Planetary Laboratory, University of Arizona. Worked with Alfred McEwen and the PIRL group, using volcanism to probe the interiors of Io and Mars.
  • 1996-2001 Research Associate Lunar and Planetary Laboratory, University of Arizona. Worked with Alfred McEwen using the Galileo SSI camera to study the active volcanism on Jupiter's moon, Io. Also examined volcanic features seen in the Mars Global Surveyor data.
  • 1998-1999 Physical Volcanologist Ocean Drilling Project, Leg 183. Examined drill cores and downhole logging data from Kerguelen Plateau flood lavas. Emphasis on determination of style of emplacement of the flows.
  • 1996-2002 Associate Researcher School of Ocean and Earth Science and Technology, University of Hawai'i. Worked with Steve Self and Thorvaldur Thordarson on the emplacement of the Columbia River Basalts as inflated pahoehoe sheet flows. Also studied the crystallization, cooling, and hardening of basalt with Jeff Taylor, Carl Thornber, and Kirti Sharma.
  • 1991-1999 Guest Investigator U. S. Geological Survey, Hawai'ian Volcano Observatory. Assisted the staff in monitoring the +17 year long Kilauea eruption. Specialized in collecting in situ field data on the dynamics and cooling of lava flows.

Other Experience

  • 2001-present Co-Investigator, HiRISE Team, Mars Reconnaissance Orbiter. High resolution camera 2005 Mars orbiter. Responsible for targeting and science analysis for volcanology; E/PO activities in the southwest, Hawai'i, Alaska, and Cascades; and sequence design, data validation, and other activities at the HIRISE operations center.
  • Spring 2002 Review Panel Member, Mars Fundamental Research Program.
  • 1999-2002 Associate Team Member, Galileo Solid State Imager. Liaison between the science team and the JPL engineers in developing encounter sequences, updating playback plans, and correcting instrument anomalies during close encounters with Io. Also assist in the production of press release materials and participate in press briefings at the University of Arizona and the Fall Meeting of the American Geophysical Union.
  • 1999-2001 MS Thesis committee member. Supervising the work of MS student Kirti Sharma at the University of Hawai'i on the non-equilibrium crystallization of basaltic lava flows. Ms. Sharma graduated in the Spring of 2001.
  • Fall 2000 Convener, GSA topical session. Entitled "Interpreting the morphology of mafic and ultramafic lava flows" to bring together petrologists, volcanologists, and planetary scientists who want to understand the processes that produce the lava flows we see.
  • Fall 1999 Co-convener, AGU special session and post-AGU workshop. Provided a forum to bring terrestrial and planetary scientists examining ultramafic volcanism on Earth and Io together.
  • Summer 1998 Instructor, Center for the Study of Active Volcanism, University of Hawai'i, Hilo. Taught the physical volcanology portion of the field volcanology class. Included effusive and explosive volcanism, remote sensing, and a trip to the active flows.
  • Summer 1998 Host, NASA PGGUR Program. Supervised a summer undergraduate intern collecting field data with application to Io from Kilauea lava flows
  • Winter 1997 Organizer, Io Working Group Meeting. Organized the meeting and field workshop for the IWG on Kilauea, including a trip to the active flows.
  • Spring 1997 Co-organizer, GSA Cordilleran Section, Field Workshop on Active and Recent Volcanism in Hawai'i. Arranged logistics (including helicopter support) for the field workshop and production of field trip guide.
  • Fall 1995 Science Crewmember, AtlantisII/Alvin Cruise (R. Batiza, PI). Participated in cruise and dives to investigate enigmatic hyaloclastite deposits on Seamount 6 off the East Pacific Rise.
  • Summer 1994 Volunteer, U. S. National Park Service, Hawai'i Volcanoes National Park. Helped interpret the geological, biological, and cultural features in the park for visitors.
  • 1988-1994 Teaching Assistant, California Institute of Technology. Helped teach "Introduction to Geology," "Introduction to Field Mapping," "Remote Sensing," and "The Moon." Ran both labs and lectures
  • 1988-1994 Independent Research, California Institute of Technology. Combined field work and numerical modeling to study the thermal budget of pahoehoe lava flows in Hawai`i and the solar system.
  • 1988-1993 Research Assistant, Jet Propulsion Laboratory. Processed and interpreted airborne remote sensing data from the Carrizozo lava flow field. Collected and interpreted IR video data from active volcanic activity on Kilauea Volcano.
  • 1988-1992 Volunteer Geologic Consultant, The Planetary Society. Assisted in site selection and operation of field tests of the Soviet/Russian/French Mars96 Balloon and Marsokhod (rover).

Past Support

  • August, 1994-July, 1996. NSF Earth Sciences Postdoctoral Fellowship. ~$80,000.
  • July, 1996-June, 1999. NSF Division of Earth Sciences. Quantitative constraints on the emplacement style and duration of continental flood basalt eruptions. $220,700. PI: S Self. (L Keszthelyi: Co-I)
  • April, 1998-March, 2000. NASA Planetary Geology and Geophysics Program. Silicate Volcanism on Io. $70,000. PI: L Keszthelyi.
  • March, 1999-February, 2001. NASA Jupiter System Data Analysis Program. Volcanism on Io. $130,000. PI: Alfred McEwen. (L Keszthelyi: Co-I)
  • March, 1999-February, 2001. NASA Mars Data Analysis Program. Quantitative interpretation of volcanic features in MOC images. $94,300. PI: L Keszthelyi.
  • June, 1999-May, 2001. JOI/USSSP. Physical Volcanology of Lava Flows from Ocean Drilling Program Leg 183. $14,314. PI: L Keszthelyi
  • June, 1999-December, 2002. NSF Division of Earth Sciences. How does basalt freeze? Field experiments and numerical modeling of Kilauea pahoehoe lava flows. $192,674. PI: L Keszthelyi
  • December, 1999-November, 2002. NASA Planetary Geology and Geophysics Program. Investigation of Extreme Temperature Volcanism on Io. $147,500. PI: L Keszthelyi
  • January 2000 - December 2002. NASA Mars Data Analysis Program. Recent Volcanic and Fluvial Activity on Mars. $261,087. PI: A McEwen (L Keszthelyi:Co-I)
  • November, 2000 - October, 2003. NASA Planetary Geology and Geophysics Program. Observations and Numerical Modeling of Tectonic Processes on Io. $150,000. PI: E Turtle (L Keszthelyi: Co-I).
  • October, 2000 - September, 2003. NASA Planetary Geology and Geophysics Program. Surface Changes on Io. $135,000. PI: P Geissler (L Keszthelyi: Co-I).

Current Support

  • November, 2001-September, 2009. NASA Mars Reconnaissance Orbiter - 2005. High Resolution Imaging Science Experiment (HiRISE) for the Mars Reconnaissance Orbiter. $50,721,045. PI: A McEwen (L Keszthelyi: Co-I).
  • February, 2003-January, 2006. NASA Planetary Geology and Geophysics Program. Developing New Views of Jupiter's Moon, Io, in the Post-Galileo Era. $114,000. PI: L Keszthelyi

Pending Support

  • January, 2003-December, 2005, NASA Mars Data Analysis Program. Is the Stealth Region of Mars Composed of Reticulite? $126,535. PI: L Keszthelyi.
  • January, 2003-December, 2005, NASA Mars Data Analysis Program. Understanding Flood Flows from Source to Sink. $207,830. PI: A McEwen (L Keszthelyi: Co-I).


Peer-Reviewed Publications

  • Keszthelyi, LP and DC Pieri (1993) The emplacement of the 75-km-long Carrizozo Flow Field, south-central New Mexico. J. Volcanol. Geotherm. Res., 59: 59-75.
  • Keszthelyi, LP (1994) On the Thermal Budget of Pahoehoe Lava Flows. Thesis, California Institute of Technology, Pasadena, 269 pp.
  • Keszthelyi, L (1994) Calculated effect of vesicles on the thermal properties of basaltic lava. J. Volcanol. Geotherm. Res., 63: 257-266.
  • Keszthelyi, L (1995) Measurements of the cooling at the base of pahoehoe flows. Geophys. Res. Lett., 22: 2195-2198.
  • Keszthelyi, L (1995) A preliminary thermal budget for lava tubes on the Earth and planets. J. Geophys. Res., 100: 20411-20420.
  • Keszthelyi, L and R Denlinger (1996) The initial cooling of pahoehoe flow lobes. Bull. Volcanol., 58: 5-18.
  • Self, S, Th Thordarson, L Keszthelyi, GPL Walker, K Hon, MT Murphy, P Long, and S Finnemore (1996) A new model for the emplacement of Columbia River basalts as large, inflated pahoehoe lava flow fields. Geophys. Res. Lett., 23: 2689-2692.
  • Keszthelyi, L, and A McEwen (1997) Thermal models for basaltic volcanism on Io. Geophys. Res. Lett., 24: 2463-2466.
  • Keszthelyi, L, and A McEwen (1997) Volcanic differentiation of Io. Icarus, 130: 437-448
  • Harris, AJL, L Keszthelyi, LP Flynn, PJ Mouginis-Mark, C Thornber, J Kauahikaua, D Sherrod, F Trusdell, MW Sawyer, and P Flament (1997) Chronology of the Episode 54 eruption at Kilauea from GOES-9 satellite data. Geophys. Res. Lett. 24: 3281-3284.
  • Self, S, Th Thordarson, and L Keszthelyi (1997) Emplacement of continental flood basalt lava flows. in JJ Mahoney and M Coffin (eds) AGU Geophysical Series Monograph 100: Large Igneous Provinces, 438pp.
  • Davies, AG, AS McEwen, RMC Lopes-Gautier, L Keszthelyi, RW Carlson, and WD Smythe (1997) Temperature and area constraints of the South Volund Volcano on Io from the NIMS and SSI instruments during the Galileo G1 orbit. Geophys. Res. Lett.., 24: 2447-2450.
  • McEwen, A, DP Simonelli, DR Senske, KP Klaasen, L Keszthelyi, TV Johnson, PE Geissler, MH Carr, and MJS Belton (1997) High-temperature hot spots on Io as seen by the Galileo Solid State Imaging (SSI) experiment. Geophys. Res. Lett., 24: 2443-2446.
  • Keszthelyi, L, and S Self (1998) Some physical requirements for the emplacement of long basaltic lava flows. J. Geophys. Res. 103: 27447-27464.
  • Self, S, L Keszthelyi, and Th Thordarson (1998) The importance of pahoehoe. Annu. Rev. Earth. Planet. Sci., 26: 81-110.
  • McEwen, AS, L Keszthelyi, JR Spencer, G Schubert, DL Matson, R Lopes-Gautier, KP Klaasen, TV Johnson, JW Head, P Geissler, S Fagents, AG Davies, MH Carr, HH Breneman, MJS. Belton (1998) High-Temperature Silicate Volcanism on Jupiter's Moon Io. Science 281: 87-90.
  • McEwen, AS, L Keszthelyi, P Geissler, DP Simonelli, MH Carr, TV Johnson, KP Klaasen, HH Breneman, TJ Jones, JM Kaufman, KP Magee, DA Senske, MJS Belton, and G Schubert (1998) Active Volcanism on Io as seen by Galileo SSI. Icarus 135: 181-219.
  • Harris, AJL, LP Flynn, L Keszthelyi, PJ Mouginis-Mark, SK Rowland and JA Resing (1998) Calculation of lava effusion rates from LANDSAT TM data. Bull. Volcanol. . 50: 52-71
  • Keszthelyi, L, S Self, and Th Thordarson (1999) Application of recent studies on the emplacement of basaltic lava flows to the Deccan Traps. in KV Subbarao (ed) Memoir Geological Society of India 43: Deccan Volcanic Province, pp. 485-520.
  • Keszthelyi, L, AS McEwen, and GJ Taylor (1999) Revisiting the hypothesis of a mushy global magma ocean in Io. Icarus, 141: 415-419.
  • Self, S, LP Keszthelyi, and Th Thordarson (1999) Discussion of: "Pulsed inflation of pahoehoe lava flows: implications for flood basalt emplacement", by S.W. Anderson, E.R. Stofan, E.R. Smrekar, J.E. Guest and B. Wood. Earth Planet. Sci. Lett., 179: 421-423.
  • Geissler, PE, AS McEwen, L Keszthelyi, R Lopes-Gautier, J Granahan, DP Simonelli (1999) Global color variations on Io. Icarus, 140: 265-282.
  • Lopes-Gautier, R, AS McEwen, WD Smythe, PE Geissler, L Kamp, AG Davies, JR Spencer, L Keszthelyi, R Carlson, FE Leader, R Mehlman, L Soderblom, and the Galileo NIMS and SSI Teams (1999) Active volcanism on Io: Global distribution and variations in activity. Icarus, 140: 243-264.
  • Keszthelyi, L, AS McEwen, and Th. Thordarson (2000) Terrestrial analogs and thermal models for Martian flood lavas. J. Geophys. Res. 105: 15027-15050.
  • McEwen, AS, R Lopes-Gautier, L Keszthelyi, SW Kieffer (2000) Extreme Volcanism on Jupiter's Moon Io. in Environmental Effects on Volcanic Eruptions: From Deep Oceans to Deep Space (T Gregg and J Zimbelman, eds.) Kluwer Academic/Plenum Publishers, New York, 266pp. .
  • McEwen, AS, MJS Belton, HH Breneman, SA Fagents, P Geissler, R Greeley, JW Head, G Hoppa, WL Jaeger, TV Johnson, L Keszthelyi, KP Klaasen, R Lopes-Gautier, KP Magee, M Milazzo, JM Moore, RT Pappalardo, CB Phillips, J Radebaugh, G Schubert, P Schuster, DP Simonelli, R Sullivan, PC Thomas, EP Turtle, and DA Williams (2000) Galileo at Io: Results from High-Resolution Imaging, Science, 288: 1193-1198.
  • Lopes-Gautier, R, S Doute, WD Smythe, LW Kamp, RW Carlson, AG Davies, FE Leader, AS McEwen, PE Geissler, SW Kieffer, L Keszthelyi, E Barbinis, R Mehlman, M Segura, J Shirley, LA Soderblom (2000) A close-up look at Io from Galileo's Near-Infrared Mapping Spectrometer, Science, 288: 1201-1204.
  • Kieffer, SW, R Lopes-Gautier, A McEwen, W Smythe, L Keszthelyi, R Carlson (2000) Prometheus: Io's wandering plume, Science, 288: 1204-1208.
  • Coffin, MF, FA Frey, P Wallace, and 27 others (2000) Proceedings of the Ocean Drilling Program, Initial Reports, Volume 183: Kerguelen Plateau-Broken Ridge, Sites 1135-1142, 7 December 1998 - 11 February 1999. Joint Oceanographic Institutions Inc, Arlington, 101pp + CDROM.
  • FA Frey, MF Coffin, PJ Wallace, D Weis, X Zhao, SW Wise Jr., V Waehnert, DAH Teagle, PJ Saccocia, DN Reusch, MS Pringle, KE Nicolaysen, CR Neal, RD Mueller, CL Moore, JJ Mahoney, L Keszthelyi, H Inokuchi, RA Duncan, H Delius, JE Damuth, D Damasceno, HK Coxall, MK Borre, F Boehm, J Barling, NT Arndt, M Antretter (2000) Origin and evolution of a submarine large igneous province; the Kerguelen Plateau and Broken Ridge, southern Indian Ocean. Earth Planet. Sci. Let., 176: 73-89.
  • Keszthelyi, L, AS McEwen, CB Phillips, M Milazzo, P Geissler, EP Turtle, J Radebaugh, DA Williams, DP Simonelli, HH Breneman, KP Klaasen, G Levanas, T Denk, and the Galileo SSI Team (2001) Imaging of volcanic activity on Jupiter's moon Io by Galileo during GEM and GMM, J. Geophys. Res., 106: 33025-33052.
  • Milazzo, M, L Keszthelyi, and A McEwen (2001) Are Prometheus-type plumes on Io produced by lava-SO2 interactions at the flow fronts?, J. Geophys. Res., 106: 33121-33128.
  • Davies, AG, LP Keszthelyi, D. A. Williams, R. M. Lopes-Gautier, A. S. McEwen, W. D. Smythe, C. B. Phillips, L. A. Soderblom, and R. W. Carlson, (2001) Thermal signature, eruption style, and eruption evolution at Pele and Pillan on Io, J. Geophys. Res., 106: 33079-33104.
  • Radebaugh, J., LP Keszthelyi, AS McEwen, and the Galileo SSI Team (2001) Paterae on Io: Characteristics, Sizes, Distribution, and Planetary Comparisons, J. Geophys. Res., 106: 33005-33020.
  • Turtle, EP, WL Jaeger, LP Keszthelyi, AS McEwen, M Milazzo, J Moore, CB Phillips, J Radebaugh, D Simonelli, F Chuang, and the Galileo SSI Team (2001) Mountains on Io: High-resolution Galileo observations, initial interpretations, and formation models, J. Geophys. Res., 106: 33175-33200.
  • Williams, DA, AG Davies, LP Keszthelyi, and R Greeley, (2001) The summer 1997 eruption at Pillan Patera on Io: Implications for ultrabasic lava flow emplacement, J. Geophys. Res., 106: 33105-33119.
  • van-Wyk-d-Vries, B, S Self, PW Francis, L Keszthelyi (2001) A gravitational spreading origin for the Socompa debris avalanche, J. Volcanol. Geotherm. Res., 105: 225-247.
  • Lanagan, PD, AS McEwen, LP Keszthelyi, Th Thordarson (2001) Rootless cones on Mars indicating the presence of shallow equatorial ground ice in recent times, Geophys. Res. Lett., 28: 2365-2367.
  • Keszthelyi, L (2002) Classification of mafic lava flows from ODP Leg 183, Scientific Results Volume, Ocean Drilling Program [online at]
  • Williams, DA, J Radebaugh, LP Keszthelyi, AS McEwen, RMC Lopes, S Doute, and R Greeley (2002) Geologic mapping of the Chaac-Camaxtli region of Io from Galileo imaging data, J. Geophys. Res., 107: 10.1029/ 2001JE001821
  • Burr, DM, JA Grier, AS McEwen, LP Keszthelyi (2002) Repeated aqueous flooding from the Cerberus Fossae: Evidence for very recently extant, deep groudwater on Mars, Icarus, 159: 53-73.
  • Sharma, K, S Self, Th Thordarson, L Keszthelyi, C Thornber (in revision) Textural and chemical variations through an inflated pahoehoe flow lobe from the Kalapana Flow Field, Kilauea Volcano, Hawai'i, J. Volcanol. Geotherm. Res.,
  • Gregg, TKP, and L Keszthelyi (submitted) The emplacement of pahoehoe toes: Field observations and comparison to laboratory simulations, Bull. Volcanol.,
  • McEwen, AS, L Keszthelyi, R Lopes, P Schenk, and J Spencer (in press) The lithosphere and surface of Io, in Bagnal, F (Ed) Jupiter.