Greg Valentine home page




Greg A. Valentine

Professor, Department of Geology

Director, Center for Geohazards Studies

State University of New York, University at Buffalo

126 Cooke Hall

Buffalo, NY  14260-1350   USA





Research Interests: Pyroclastic deposits, volcano fluid dynamics & modeling, phreatomagmatism, basaltic volcanism, volcanic risk.  More information


Current Work and Student Projects: Phreatomagmatic processes; ignimbrites and caldera-forming eruptions; Hazard SEES Persistent Volcanic Crises Resilience in the Face of Prolonged and Uncertain Risk; Lunar Crater Volcanic Field;  VHub – Cyberinfrastructure for Volcano Eruption and Hazards Modeling and Simulation.  More information


Degrees:  Ph.D., Geological Sciences, University of California Santa Barbara, 1988

               B.S. Geological Engineering & Geology, New Mexico Institute of Mining and Technology, 1984


Previous positions:  1997-2007 Group Leader, 1989-1996 Technical Staff Member

                                Los Alamos National Laboratory, Earth and Environmental Sciences Division


Recent publications:

    Moitra* P, Sonder I, Valentine GA (2018) Effects of size and temperature-dependent thermal conductivity on the cooling of pyroclasts in air.  G3 – Geochemistry, Geophysics, Geosystems 19: doi:10.1029/2018GC007510


    Tierz P, Stefanescu ER, Sandri L, Sulpizio R, Valentine GA, Marzocchi W, Patra A (2018) Towards quantitative volcanic risk of pyroclastic density currents: probabilistic hazard curves and maps around Somma-Vesuvius (Italy).  Journal of Geophysical Research Solid Earth 123:6299-6317, doi:10.1029/2017JB015383


    Sweeney MR*, Grosso Z*, Valentine GA (2018) Topographic controls on a phreatomagmatic maar-diatreme eruption (Holocene Dotsero volcano, Colorado, USA): field and numerical results.  Bulletin of Volcanology 80:78, doi:10.1007/s00445-018-1253-x


    Johnson, PJ, Valentine GA, Stauffer PH, Lowry CS, Sonder I, Pulgarin CC, Agudelo A (2018) Groundwater drainage from fissures as a source for lahars.  Bulletin of Volcanology 80:39, doi:10.1007/s00445-018-1214-4


    Valentine GA, Sweeney MR (2018) Compressible flow phenomena at inception of lateral density currents fed by collapsing gas-particle mixtures.  Journal of Geophysical Research Solid Earth 123, doi:10.1002/2017JB015129


    Harp AG, Valentine GA (2018) Emplacement controls for the basaltic-andesitic radial dikes of Summer Coon volcano and implications for flank vents at stratovolcanoes.  Bulletin of Volcanology 80: 16, doi:10.1007/s00445-018-1194-4


    Graettinger AH, Valentine GA (2017) Evidence for the relative depths and energies of phreatomagmatic explosions recorded in tephra rings.  Bulletin of Volcanology 79: 88, doi:10.1007/s00445-017-1177-x


    Sweeney MR, Valentine GA (2017) Impact zone dynamics of dilute mono-and polydisperse jets and their implications for initial conditions of pyroclastic density currents.  Physics of Fluids 29: 093304, doi:10.1063/1/5004197.


    Valentine GA, White JDL, Ross P-S, Graettinger AH, Sonder I (2017) Updates to concepts on phreatomagmatic maar-diatremes and their pyroclastic deposits.  Frontiers in Earth Science 5:68, doi:10.2289/feart.2017.00068


    Amin J, Valentine GA (2017) Compound maar crater and co-eruptive scoria cone in the Lunar Crater Volcanic Field (Nevada, USA).  Journal of Volcanology and Geothermal Research 339: 41-51, doi:10.1016/jvolgeores.2017.05.002


    Tadini A, Bevilacqua A, Neri A, Cioni R, Aspinall WP, Bisson M, Isaia R, Mazzarini F, Valentine GA, Vitale S, Baxter PJ, Bertagnini A, Cerminara M, De Michieli Vitturi M, Di Roberto A, Engwell S, Esposti Ongaro T, Flandoli F, Pistolesi M (2017) Assessing future vent opening locations at the Somma-Vesuvio volcanic complex: 2. Probability maps of the caldera for a future Plinian/sub-Plinian event with uncertainty quantification.  Journal of Geophysical Research, doi:10.1002/2016JB013860.


    Valentine GA, Cortes JA, Widom E, Smith EI, Rasoazanamparany C, Johnsen R, Briner JP, Harp AG, Turrin B (2017) Lunar Crater Volcanic Field (Reveille and Pancake Ranges, Basin and Range Province, Nevada, USA).  Geosphere 13: 391-438, doi:10.1130/GES01428.1.


    Bonadonna, C  R Cioni, A Costa, T Druitt, J Phillips, L Pioli, D Andronico, A Harris, S Scollo, O Bachmann, G Bagheri, S Biass, F Brogi, K Cashman, L Dominguez, T Durig, O Galland, G Giordano, M Gudmundsson, M Hort, A Hoskuldsson, B Houghton, JC Komorowski, U Kueppers, G La Canna, JL Le Pennec, G Macedonio, M Manga, I Manzella, M de Michieli Vitturi, A Neri, M Pistolesi, M Polacci, M Ripepe, E Rossi, B Scheu, R Sulpizio, B Tripoli, S Valade, GA Valentine, C Vidal, N Wallenstein (2016) MiMoVolc report on classification and dynamics of volcanic explosive eruptions.  Bulletin of Volcanology 78: 84, doi:10.1007/200445-016-1071-y.


    Breard ECP, Lube G, Jones JR, Dufek J, Cronin SJ, Valentine GA, Moebis A (2016) Coupling of turbulent and non-turbulent flow regimes within pyroclastic density currents.  Nature Geoscience 9: 767-771, doi:10.1038/NGEO2794.


    Graettinger AH, Valentine GA, Sonder I (2016) Recycling in debris-filled volcanic vents.  Geology 44: 811-814, doi:10.1130/G38081.1.


    White JDL, Valentine GA (2016) Magmatic versus phreatomagmatic fragmentation: absence of evidence is not evidence of absence.  Geosphere 12: 1478-1488, doi:10.1130/GES01337.1


    Macorps E, Graettinger AH, Valentine GA, Ross P-S, White JDL, Sonder I (2016) The effects of host-substrate properties on maar-diatreme volcanoes: experimental evidence.  Bulletin of Volcanology 78:26, doi:10.1007/s00445-016-1013-8


    Roche O, Buesch DC, Valentine GA (2016) Slow-moving, far-travelled dense pyroclastic flows during the Peach Spring super-eruption.  Nature Communications 7: 10890, doi:10.1038/NCOMMS10890


    Ball JL, Stauffer PJ, Calder ES, Valentine GA (2015) The hydrothermal alteration of cooling lava domes.  Bulletin of Volcanology 77:102, doi:10.1007/s00445-015-0986-z


     Graettinger AH, Valentine GA, Sonder I (2015) Circum-crater variability of deposits from discrete, laterally and vertically migrating volcanic explosions: experimental evidence and field implications.  Journal of Volcanology and Geothermal Research 308:61-69, doi: 10.1016/j.jvolgeores.2015.10.019


     Valentine GA, Sottili G, Palladino DM, Taddeucci J (2015) Tephra ring interpretation in light of evolving maar-diatreme concepts:  Stracciacappa maar (central Italy).  Journal of Volcanology and Geothermal Research 308: 19-29, doi:10.1016/j.jvolgeores.2015.10.010


     Breard ECP, Lube G, Cronin SJ, Valentine GA (2015) Hydrothermal blast-produced pyroclastic density currents:  dynamics and deposition models.  Bulletin of Volcanology 77:100, doi:10.1007/s00445-015-0980-5


     Sonder I, Graettinger AH, Valentine GA (2015) Scaling multiblast craters:  general approach and application to volcanic craters.  Journal of Geophysical Research 120, doi:10.1002/2015JB012018


     Palladino DM, Valentine GA, Sottili G, Taddeucci J (2015) Maars to calderas:  end-members on a spectrum of explosive volcanic depressions.  Frontiers in Earth Science 3:36, doi: 10.3389/feart.2015.00036


 Sweeney MR, Valentine GA (2015) Transport and mixing dynamics from explosions in debris-filled volcanic conduits: Numerical results and implications for maar-diatreme volcanoes.  Earth and Planetary Science Letters 425: 64-76, doi:10.1016/j.epsl.2015.05.038


 Graettinger AH, Valentine GA, Sonder I, Ross P-S, White JDL (2015) Facies distribution of ejecta in analog tephra rings from experiments with single and multiple subsurface explosions.  Bulletin of Volcanology 77:66, doi:10.1007/s00445-015-0951-x


    Valentine GA, Connor CB (2015) Basaltic volcanic fields.  In:  The Encyclopedia of Volcanoes, 2nd Edition, H. Sigurdsson (ed.), Elsevier, 423-439, doi: 10.1016/B978-0-12-385938-9.00023-7


 Harp AG, Valentine GA (2015) Shallow plumbing and eruptive processes of a scoria cone built on steep terrain.  Journal of Volcanology and Geothermal Research 294:37-55, doi:10.1016/j.jvolgeores.2015.02.008


 Cortes JA, Smith EI, Valentine GA, Johnsen R, Rasoazanamparany C, Widom E, Sas M, Ruth D (2015) Intrinsic conditions of magmas from the Lunar Crater Volcanic Field (Nevada): Implications for internal plumbing and magma ascent.  American Mineralogist 100: 396-413, doi:10.2138/am-2015-4812


 Valentine GA, Graettinger AH, Macorps E, Ross P-S, White JDL, Dohring E, Sonder I (2015) Experiments with vertically- and laterally-migrating subsurface explosions with applications to the geology of phreatomagmatic and hydrothermal explosion craters and diatremes.  Bulletin of Volcanology 77:15, doi: 10.1007/s00445-015-0901-7


  Rasoazanamparany C, Widom E, Valentine GA, Smith EI, Cortes JA, Kuentz D, Johnsen R (2015) Origin of chemical and isotopic heterogeneity in a mafic, monogenetic volcanic Field: a case study of the Lunar Crater Volcanic Field, Nevada.  Chemical Geology 397: 76-93, doi:10.1016/j.chemgeo.2015.01.004.


 Tadini A, Bonali FL, Corazzato C, Cortes JA, Tibaldi A, Valentine GA (2014) Spatial distribution and structural analysis of vents in the Lunar Crater Volcanic Field (Nevada, USA).  Bulletin of Volcanology 76:877, doi:10.1007/s00445-014-0877-8


  Johnson PJ, Valentine GA, Cortes JA, Tadini A (2014) Basaltic tephra from monogenetic Marcath Volcano, central Nevada, Journal of Volcanology and Geothermal Research 281: 27-33, doi: 10.1016/j.volgeores.2014.05.007


 Valentine GA, Graettinger AH, Sonder I (2014) Explosion depths for phreatomagmatic eruptions.  Geophysical Research Letters, doi: 10.1002/2014GL060096


      Bowman DC, Taddeucci J, Kim K, Anderson JF, Lees JM, Graettinger AH, Sonder I, Valentine GA (2014) The acoustic signatures of ground acceleration, gas expansion, and spall fallback in experimental volcanic explosions.  Geophysical Research Letters 41: 1916-1922, doi:10.1002/2014GL059324


      Graettinger AH, Valentine GA, Sonder I, Ross P-S, White JDL, Taddeucci J (2014) Maar-diatreme geometry and deposits:  subsurface blast experiments with variable explosion depth.  G3 – Geochemistry, Geophysics, Geosystems 15, doi:10.1002/2013GC005198


      Valentine GA, van Wyk de Vries B (2014) Unconventional maar-diatreme and associated intrusions in the soft sediment-hosted Mardoux structure (Gergovie, France).  Bulletin of Volcanology 76:807, doi: 10.1007/s00445-014-0807-9


      Palma JL, Courtland L, Charbonnier S, Tortini R, Valentine GA (2014) Vhub:  a knowledge management system to facilitate online collaborative volcano modeling and research.  Journal of Applied Volcanology 3:2, doi: 10.1186/2191-5040-3-2


      Valentine GA, Cortes JA (2013) Time and space variations in magmatic and phreatomagmatic eruptive processes at Easy Chair (Lunar Crater Volcanic Field, Nevada, USA).  Bulletin of Volcanology 75:752, doi:10.1007/s00445-013-0752-z.


      Roche O, Nino Y, Mangeney A, Brand B, Pollock N, Valentine GA (2013) Dynamic pore pressure variations induce substrate erosion by pyroclastic flows.  Geology, doi:10.1130/G34668.1


      Ross P-S, White JDL, Valentine GA, Taddeucci J, Sonder I, Andrews RG (2013) Experimental birth of a maar-diatreme volcano.  Journal of Volcanology and Geothermal Research 260: 1-12, doi:10.1016/j.jvolgeores.2013.05.005


      Brown RJ, Valentine GA (2013) Physical characteristics of kimberlite and basaltic intraplate volcanism, and implications of a biased kimberlite record.  Geological Society of America Bulletin 125: 1224-1238, doi:10.1130/B30749.1


      Taddeucci J, Valentine GA, Sonder I, White JDL, Ross P-S, Scarlato P (2013) The effect of pre-existing craters on the initial development of explosive volcanic eruptions:  an experimental investigation.  Geophysical Research Letters 40: 507-510, doi:10.1002/grl.50176



Full publication list

Also see other members of the UB Volcanoes and Geohazards Group


Updated 6 November 2018