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
Email: gav4@buffalo.edu
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.
Also see other members of the UB
Volcanoes and Geohazards Group
Updated
13 August 2019