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:

      Younger ZP, Valentine GA, Gregg TKP (2019) 'A'ā lava emplacement and the significance of rafted pyroclastic material: Marcath volcano (Nevada, USA).  Bulletin of Volcanology 81:50, doi:10.1007/200445-019-1309-6


Valentine GA, Palladino DM, DiemKaye K, Fletcher C (2019) Lithic-rich and lithic-poor ignimbrites and their basal deposits: Sovana and Sorano formations (Latera caldera, Italy).  Bulletin of Volcanology 81:29, doi:10.1007/s00445-019-1288-7


      Valentine GA, Briner JP, van Wyk de Vries B, Macorps E, Gump D (2019) 10Be exposure ages for the Late Pleistocene Gour de Tazenat maar (Chaine des Puys volcanic field, Auvergne, France).  Quaternary Geochronology 50:8-13, doi:10.1016/j.quageo.2018.11.002


      Sonder I, Harp AG, Graettinger AH, Moitra P, Valentine GA, Buttner R, Zimanowski B (2018) Meter-scale experiments on magma-water interaction.  Journal of Geophysical Research Solid Earth 123, doi:10.1029/2018JB015682


      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.




Full publication list

Also see other members of the UB Volcanoes and Geohazards Group


Updated 13 August 2019