PhD, Geological Sciences, University of California Santa Barbara – 1988

Physical processes associated with basaltic volcanism, from the scale of eruptive styles at individual volcanoes to the dynamics of basaltic fields. Interpretation of pyroclastic deposits including large-volume, widespread ignimbrites and associated calderas. Multiphase fluid dynamics and numerical modeling of explosive eruptions. Consequences of volcanic activity and spatial-temporal behavior of volcanic systems, with application to risk assessment and coupling to infrastructure response models. Evolution of volcanic landforms, particularly in arid environments.

• ERT 205 - Earth Materials
• ERT 215 – Sedimentology
• ERT 407/507 – Geologic Field Training (Field Camp)
• ERT 428/528 – Geologic Hazards and Risk
• ERT 431/531 – Volcanology
• ERT 433/533 – Volcanic Rocks
• ERT 578 – Advanced Field Methods
• ERT 499 – Independent Study
• ERT 599 – Supervised Teaching
• ERT 633 – Graduate Research
• ERT 700 – Thesis Guidance

• Brandon Keim - PhD - Computational fluid dynamics of pyroclastic surges (Fall 2022)
• Maria Clara Parreira Murta - PhD - Basaltic volcanism in southwest Utah
  

• Meredith Cole - PhD - Caldera-forming explosive eruptions
  
• Patrick Bobbitt - MS (2021) - Dike to vent transitions within a basaltic volcano, Horace Mesa, New Mexico
  
• Claudia Fletcher - MS (2021) - Basal deposits of pyroclastic density currents: Sovana ignimbrite, Vulsini District, Italy
  
• Peter Johnson – PhD (2018) – Fluid flow in disrupted porous media: volcanological and radiological waste applications.
• Andrew Harp – PhD (2018) – The impacts of local stress fields and host rock heterogeneity on magma transport and extrusion at stratovolcanoes
•  Matthew Sweeney – PhD (2018) – Multiphase flow in explosive volcanic eruptions: field and numerical results
• Zachary Younger – MS (2018) – Basaltic aa lava field emplacement of the intraplate Marcath volcano (central Nevada) from field and LiDAR data 

• Dr. Pranabendu Moitra - 2015 to 2017 - Experimental magma-water interaction.
• Dr. Alison Graettinger - 2013 to 2016 - Research focus on experimental studies of phreatomagmatic explosive eruptions.

Cole MA, Valentine GA (2025) Ash-cloud surge origin and influence of local topography for stratified and cross-stratified deposits beneath Bandelier Tuff ignimbrite (Tshirege Member, Pajarito Plateau, New Mexico, USA).  Bulletin of Volcanology 87:80, doi: 10.1007/s00445-025-01866-5

Valentine GA, de Silva SL (2025) Explosive eruption column dynamics for crystal-rich magmas.  Geophysical Research Letters 52:e2024GL114069, doi:10.1029/2024GL114069

Zarazúa-Carbajal MC, Valentine GA, De la Cruz-Reyna S (2024) Scoria cone erosional degradation by incision: different behaviors in three volcanic fields reflect environmental conditions.  Geology 52:565-569, doi:10.1130/G52113.1

Valentine GA, (2023) Effects of debris entrainment and recycling on explosive volcanic eruption jets and columns.  Bulletin of Volcanology 85:57, doi:10.1007/s00445-023-01675-8

Valentine GA, Fierstein J, White JDL (2022) Lateral extent of pyroclastic surge deposits at Ubehebe Crater (Death Valley, CA) and implications for hazards in monogenetic volcanic fields.  Geophysical Research Letters, doi:10.1029/2022GL100561.

Valentine GA, Fierstein J, White JDL (2022) Pyroclastic deposits of Ubehebe Crater (Death Valley, California): ballistics, pyroclastic surges, and dry granular flows.  Geosphere, doi:10.1130/GES02526.1

Sonder I, Graettinger A, Neilsen T, Matoza R, Taddeucci J, Oppenheimer J, Lev E, Tsunematsu K, Waite G, Valentine GA, Befus K (2022) Experimental multiblast craters and ejecta - seismo-acoustics, jet characteristics, craters, and ejecta deposits and implications for volcanic explosions.  Journal of Geophysical Research Solid Earth, 127, e2022JB023952, doi:10.1029/2022JB023952

Valentine GA, Ort MH, Cortés JA (2021) Quaternary basaltic volcanic fields of the American Southwest.  Geosphere, doi: 10.1130/GES02405.1 

Valentine GA, Cole MA* (2021) Explosive caldera-forming eruptions and debris-filled vents: gargle dynamics.  Geology 49:1240-1244, doi: 10.1130/G48995.1 

Valentine GA, Fierstein J, White JDL (2021) Soft sediment deformation in dry pyroclastic deposits at Ubehebe Crater. Death Valley, California.  Geology, doi:10.1130/G48147.1

Esposti Ongaro T, Cerminara M, Charbonnier SJ, Lube G, Valentine GA (2020) A framework for validation and benchmarking of pyroclastic current models.  Bulletin of Volcanology 82:51​

Moitra P, Sonder I, Valentine GA (2020) The role of external water on rapid cooling and fragmentation of magma.  Earth and Planetary Sciences 537:116194, doi:10.1016/j.epsl.2020.116194

Valentine GA (2020) Initiation of dilute and concentrated pyroclastic currents from collapsing mixtures and origin of their proximal deposits.  Bulletin of Volcanology 82:20, doi:10.1007/s00445-020-1366-x