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 Planetary Geosciences: People
Ashley  Davies's Picture
Jet Propulsion Laboratory
M/S 183-501
4800 Oak Grove Drive
Pasadena, CA 91109
Curriculum Vitae:

Ashley Davies

  • B.Sc (Hons.) in Astronomy and Geology, Hatfield Polytechnic, Hatfield, Herts. UK (1984)
  • Ph.D. in Volcanology, Lancaster University, Lancaster, UK (1988)

Research Interests
  • Planetary science: in particular, the jovian satellite Io
  • Remote sensing of volcanic activity
  • Hyperspectral and multispectral data analysis
  • Numerical and analytical modelling of volcanic processes on Io, Earth, and icy satellites
  • Autonomous spacecraft and sensor web operations
  • Infrared imager development


Europa Mission Icon Europa Mission

NASA's Europa mission will conduct detailed reconnaissance of Jupiter's moon Europa to investigate whether the icy moon could harbor conditions suitable for life.

ASTER Volcano Archive (AVA) Icon ASTER Volcano Archive (AVA)
This website provides access to a substantial part of the ASTER Volcano Archive (AVA) image data acquired over the life of the ASTER mission.

Autonomous Sciencecraft Experiment (ASE) Icon Autonomous Sciencecraft Experiment (ASE)
The Autonomous Sciencecraft Experiment (ASE) is operating onboard the Earth Observing-1 mission since 2003.

Volcano Sensor Web Icon Volcano Sensor Web
The Sensor Web Project uses a network of sensors linked by software and the internet to an autonomous satellite observation response capability.

Professional Experience
  • Jet Propulsion Laboratory (1996 - present)
    • Mapping Imaging Spectrometer for Europa (MISE) Co-I (2015-Present)
    • NMP-Autonomous Sciencecraft Experiment Lead Scientist (2001-present)
    • ASTER Team Associate (2004-present)
    • Research Scientist, Comets, Asteroids and Satellites Group (2003 - present)
    • Research Scientist, Galileo NIMS team (2001-2002)
    • Scientist, Galileo NIMS team (1996-2001)
  • National Research Council Resident Research Associate, NASA JPL (1994-1996)
  • UK Meteorological Office: Higher Scientific Officer (1990 - 1994)
    • ARTIFAX Systems Programmer (1990-1991)
    • Short-Range Forecast Division (Research Scientist)

Selected Awards
  • JPL Voyager Award (for management of Group 3223) (2020)
  • NASA Software of the Year: Honourable mention: "Sensor Web Toolbox" (2011)
  • NASA Space Act Award: "Autonomous Volcano Sensor Web" (2007)
  • NASA Software of the Year - Autonomous Sciencecraft Experiment (2005)
  • NASA Group Achievement Award for the Autonomous Sciencecraft Experiment Team (2005)
  • NASA Tech Brief award "Software for Onboard Science Analysis" (2003)
  • JPL Team Bonus Award: "Jupiter Icy Moon Orbiter (JIMO) Studies" (2003)
  • NASA Group Achievement Award to the Galileo Project Team (1998)
  • National Research Council Postdoctoral Fellowship (1994-1996)

Selected Publications
  • Book
  • Davies, A. G. "Volcanism on Io: A Comparison with Earth", Cambridge University Press, 372 pages, 2007.
    • Journal Articles
      • Mura, A. Adriani, F. Tosi, R. Lopes, G. Sindoni, G. Filacchione, D.A. Williams, A. G. Davies, C. Plainaki, S. Bolton, F. Altieri, A. Cicchetti, D. Grassi, A. Migliorini, M. L. Moriconi, R. Noschese, A. Olivieri, G. Piccioni and R. Sordini (2020) Infrared observations of Io from Juno. Icarus, 341, 1 May 2020, 113607.
      • de Kleer, K. I. de Pater, E. Molter, E. Banks, A. G. Davies, C. Alvarez. R. Campbell, J. Aycock, J. Pelletier, G. Puniwai, T. Stickel, D. Eugenio, N. M. Nielsen, D. Stern, and J. Tollefson (2019) Io's Volcanic Activity from Time-Domain Adaptive Optics Observations: 2013-2018, Astron. J., 158, 29, 14 pages
      • Davies, A. G., R. L. Davies, G. J. Veeder, K. de Kleer, I. de Pater, D. L. Matson, T. V. Johnson and L. Wilson (2018) Discovery of a Powerful, Transient, Explosive Thermal Event at Marduk Fluctus, Io, in Galileo NIMS Data, GRL, 45, 2926-2933.
      • Davies, A. G., S. Gunapala, A. Soibel, D. Ting, S. Rafol, M. Blackwell, P. O. Hayne, M. Kelly (2017) A novel technology for measuring the eruption temperature of lavas with remote sensing: application to Io and other planets, JVGR, 343, 1-16. doi: 10.1016/j.jvolgeores.2017.04.016. de Kleer, K, M. Skrutskie, J. Leisening, A. G. Davies, A. Conrad, I. de Pater, A. Resnick, V. Bailey, D. Defrére, P. Hinz, A. Skemer, E. Spalding, A. Vaz, C. Veillet and C.E. Woodward (2017) Multi-phase volcanic resurfacing of Io's Loki Patera, Nature, 545, 199-202. doi:10.1038/nature22339.
      • de Pater, I., K. de Kleer, A. G. Davies and M. Ádámkovics (2017) Three Decades of Loki Patera Observations, Icarus, 297, 265-281 doi: 10.1016/j.icarus.2017.03.016.
      • Davies, A. G., L. P. Keszthelyi and A. S. McEwen (2016) Determination of Eruption Temperature of Io's Lavas Using Lava Tube Skylights, Icarus, 278, 266-278, doi:10.1016/j.icarus.2016.06.003.
      • Davies, A. G., G. J. Veeder, D. L. Matson and T. V. Johnson (2015) Map of Io's Volcanic Heat Flow, Icarus, 262, 67-78. doi:
      • Davies, A. G., Chien, S., Tran, D. and Doubleday, J. (2015) The NASA Volcano Sensor Web, Advanced Autonomy, and the Remote Sensing of Volcanic Eruptions, Chapter in the Geological Society of London-IAVCEI book "Detecting, Modeling and Responding to Effusive Eruptions", eds. A. J. L. Harris, T. De Groove, P. Labazuy and S. Carn, GSA, London, UK.
      • Davies, A. G., G. J. Veeder, S. I. Hill, D. L. Matson and T. V. Johnson (2014) Charting thermal emission variability at Amirani with the Galileo NIMS Io Thermal Emission Database (NITED), Icarus, 241, 190-199. doi: 10.1016/j.icarus.2014.06.034.
      • de Pater, I., Davies, A.G., Ádámkovics, M., Ciardi, D.R (2014) Two New, Rare, High-Effusion Outburst Eruptions at Rarog and Heno Paterae on Io. Icarus, 242, 365-378. doi: 10.1016/j.icarus.2014.06.016.
      • Davies, A. G., S. Chien, J. Doubleday, D. Tran, T. Thordarson, M. T. Gudmundsson, Á. Höskuldsson, S. S. Jakobsdóttir, R. Wright and D. Mandl (2013) Observing Iceland's Eyjafjallajökull 2010 Eruptions with the Autonomous NASA Volcano Sensor Web, JGR-Solid Earth, 118, 1-21, doi:10.1002/jgrb.50141.
      • Davies, A. G., G. J. Veeder, D. L. Matson and T. V. Johnson (2012) Charting thermal emission variability at Pele, Janus Patera and Kanehekili Fluctus with the Galileo NIMS Io Thermal Emission Database (NITED), Icarus, 221, 466-470. doi:10.1016/j.icarus.2012.04.01.
      • Matson, D. L., J. C. Castillo-Rogez, A. G. Davies, T. V. Johnson and J. Lunine (2012) Enceladus: A Hypothesis For Bringing Both Heat And Chemicals To the Surface, Icarus, 221, 53-62.
      • Davies, A. G., G. J. Veeder, D. L. Matson and T. V. Johnson (2012) Charting thermal emission variability at Pele, Janus Patera and Kanehekili Fluctus with the Galileo NIMS Io Thermal Emission Database (NITED), Icarus. In press. doi:10.1016/j.icarus.2012.04.01.
      • Davies, A. G., G. J. Veeder, D. L. Matson and T. V. Johnson (2012) Io: Charting thermal emission variability with the Galileo NIMS Io Thermal Emission Database (NITED): Loki Patera, Geophysical Research Letters, 39, L01201, doi:10.1029/2011GL049999.
      • Davies, A. G., L. Keszthelyi and A. S. McEwen (2011) Estimating Eruption Temperature From Thermal Emission Spectra of Lava Fountain Activity in the Erta'Ale (Ethiopia) Volcano Lava Lake - Implications for Observing Io's Volcanoes, GRL, 38, L21308, doi: 10.1029/2011GL049418.
      • Davies A. G. (2011) Lava lakes on Earth and Io, Planetary Report, vol. XXXI, no. 2, 10-15.
      • Davies A. G. and M. E. Ennis (2011) The variability of volcanic activity at Zamama, Culann, and Tupan Patera on Io as seen by the Galileo Near Infrared Mapping Spectrometer, Icarus, 215, 401-416.
      • Wright, R. H. Garbeil and A. G. Davies (2011) The cooling rate of some active lavas determined using an orbital imaging spectrometer, JGR (Solid Earth), 115, B06205, doi:10.1029/2009JB006536.
      • Davies, A. G., C. Sotin, D. L. Matson, J. C. Castillo-Rogez, T. V. Johnson, M. Choukroun, and K. H. Baines (2010) Atmospheric control of the cooling rate of impact melts and cryolavas on Titan's surface, Icarus, 208, 887-895, doi:10.1016/j.icarus.2010.02.025.
      • Davies, A.G., L. P. Keszthelyi and A. J. L. Harris (2010) The Thermal Signature of Volcanic Eruptions on Io and Earth, JVGR, 194, 75-99, doi:10.1016/j.jvolgeores.2010.04.009.
      • Leone, G., A. G. Davies, L. Wilson, D. A. Williams, L. P. Keszthelyi, W. L. Jaeger and E. P. Turtle (2009) Volcanic history, geologic analysis and map of the Prometheus Patera region on Io, Icarus, 187, 93-105.
      • Davies, A. G., J. Calkins, L. Scharenbroich, R. G. Vaughan, R. Wright, P. Kyle, R. Castańo, S. Chien, and D. Tran (2008) Multi-Instrument Remote and In Situ Observations of the Erebus Volcano (Antarctica) Lava Lake in 2005: a Comparison with the Pele Lava Lake on the Jovian Moon Io, J. Volc. Geotherm. Res., 177, v3, 705-724.
      • Keszthelyi, L. P., W. Jaeger, M. Milazzo, J. Radebaugh, A. G. Davies and K. Mitchell (2007) New estimates for Io eruption temperatures: implications for the interior, Icarus, 192, 491-502.
      • Matson, D. L., A. G. Davies, J. A. Rathbun, G. J. Veeder, T. V. Johnson and J. C. Castillo (2006) Io: Loki Patera as a magma sea, JGR-Planets, 111, E09002, doi:10.1029/2006JE002703.
      • Davies, A. G., L. Wilson, D. L. Matson, G. Leone, L. P. Keszthelyi and W. Jaeger (2006) The pulse of the volcano: discovery of episodic activity at Prometheus on Io, Icarus, 184, 460-477.
      • Davies, A. G., S. Chien, V. Baker, T. Doggett, J. Dohm, R. Greeley, F. Ip, R. Castaňo, B. Cichy, G. Rabideau, D. Tran and R. Sherwood (2006) Monitoring Active Volcanism with the Autonomous Sciencecraft Experiment on EO-1, Rem. Sens. Environ., 101, no. 4, 427-446.
      • Doggett, T., R. Greeley, A. G. Davies, S. Chien, B. Cichy, R. Castano, K. Williams, V. Baker, J. Dohm and F. Ip (2006) Autonomous detection of cryospheric change with Hyperion onboard Earth-Observing 1, Rem. Sens. Environ., 101, no. 4, 447-462.
      • Davies, A. G., S. Chien, R. Wright, A. Miklius, P. R. Kyle, M. Welsh, J. B. Johnson, D. Tran, S. R. Schaffer, and R. Sherwood (2006) Sensor web enables rapid response to volcanic activity, Eos, 87 (1), 1&5.
      • Davies, A. G., D. L. Matson, G. J. Veeder, T. V. Johnson and D. L. Blaney (2005) Post-solidification cooling and the age of Io's lava flows, Icarus, 176, 123-137.
      • Davies, A. G. (2003) Volcanism on Io: estimation of eruption parameters from Galileo NIMS data. J. Geophys. Res., 108, 5106-5120.
      • Davies, A. G., (2003) Temperature, Age and Crust Thickness Distributions of Loki Patera on Io from Galileo NIMS data: Implications for Resurfacing Mechanism. Geophysical Research Letters, 30, 2133-2136.
      • Davies, A. G., L. P. Keszthelyi, D. Williams, C. B. Phillips, A. S. McEwen, R. M. C. Lopes, W.D. Smythe, L. W. Kamp, 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, E12, 33,079-33,104.
      • Williams, D. A., A. G. Davies, L. P. Keszthelyi and R. Greeley (2001) The Summer 1997 eruption at Pillan Patera on Io: implications for ultrabasic lava flow emplacement, J. Geophys. Res., 106, E12, 33,105-33,120.
      • Davies, A. G. (1996) Io's volcanism: thermo-physical models of silicate lavas compared with observations of thermal emission. Icarus, 124, no 1, 45-61

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