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  1. AGU Members
  2. Dennis Geist
DG
Member Since 1983
Dennis Geist
Retired, Retired
Chair, Volcanology, Geochemistry, and Petrology Fellows Committee; Fellows Committee Chair, Volcanology, Geochemistry, and Petrology Executive Committee
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Dennis' AGU Research
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Geochemical and morphological constraints on the construction and evolution of the Galápagos Platform and Archipelago
MULTIDISCIPLINARY PERSPECTIVES ON OCEAN ISLAND AND SEAMOUNT PROCESSES FROM ABOVE THE TOP TO BELOW THE BOTTOM II POSTER
volcanology, geochemistry and petrology | 18 december 2025
Comment to Shreve and Delgado (2023)—“Trapdoor Fault Activation: A Step Toward Caldera Collapse at Sierra Negra, Galapagos, Ecuador”
JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH
21 october 2025
To form a caldera or not to form a caldera, that is the question: The influence of tectonic stresses from an adjacent mid-ocean ridge on caldera formation in the eastern Galápagos Archipelago
COUPLED MAGMATIC-TECTONIC CALDERA-RIFT SYSTEMS - SESSION 2A
11 february 2025
Calderas of the Western Galápagos and Comparisons to Hawaii
RECORDED ERUPTIONS AND OPEN QUESTIONS – SESSION 1C
10 february 2025
Submarine Volcanic Terraces at the Base of the Galápagos Archipelago - New Field Studies Using Alvin and Multibeam Mapping
MODERN SUBMARINE VOLCANISM AND ITS IMPACTS I POSTER
volcanology, geochemistry and petrology | 14 december 2023
Novel stable isotope constraints on mantle mineralogical heterogeneity and the evolution of mantle plumes
PROCESSES AND IMPACTS OF CRUSTAL RECYCLING: INSIGHTS FROM NONTRADITIONAL STABLE ISOTOPES II ORAL
volcanology, geochemistry and petrology | 15 december 2022
Submarine Volcanism in the Galápagos Archipelago: Tectonic Controls
FOCUSED OBSERVATIONS OF RIDGE NEAR-AXIS REMOTE AND IN SITU INVESTIGATIONS: MAGMATIC, VOLCANIC, HYDROTHERMAL, AND BIOLOGICAL PROCESSES II ORAL
volcanology, geochemistry and petrology | 15 december 2021
Ocean-Island Rhyolites
A MEDLEY OF TECTONICALLY DRIVEN MAGMATISM IN THE NORTHWESTERN UNITED STATES III POSTER
volcanology, geochemistry and petrology | 13 december 2021
Volunteer Experience
2025 - 2028
Chair
Volcanology, Geochemistry, and Petrology Fellows Committee
2023 - 2028
Fellows Committee Chair
Volcanology, Geochemistry, and Petrology Executive Committee
2020 - 2024
Member
Volcanology, Geochemistry, and Petrology Fellows Committee
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