DG
Member Since 1983
Dennis Geist
Retired, Retired
AGU Research
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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
Darin M. Schwartz, Janine Andrys, Dennis Geist, Sh...
The Galápagos Archipelago is unique among other similar-sized volcanic chains sourced by hotspot volcanism because its islands are positioned ato...
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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
Helen M. Williams, Caroline Soderman, Simon Matthe...
Many studies of transition metal stable isotope systems have exploited variations in mineral- and redox-specific equilibrium fractionation effects to ...
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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
Karen S. Harpp, Dennis Geist, Daniel J. Fornari
Over the past few decades, high-resolution bathymetric and sonar-reflection surveys have revealed that the ocean floor around the Galápagos encompasse...
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Ocean-Island Rhyolites
A MEDLEY OF TECTONICALLY DRIVEN MAGMATISM IN THE NORTHWESTERN UNITED STATES III POSTER
volcanology, geochemistry and petrology | 13 december 2021
Dennis Geist
The generation of rhyolite from basaltic magma (Grunder, 1995) is a natural consequence of the cooling of melt and crystal-liquid fractionation. That ...
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Forecasting the June 26, 2018 Eruption of Sierra Negra Volcano, Galapagos
MAGMATISM, TECTONICS, AND FAULTING IN RIFTS, ARCS, RIDGES, CALDERAS, AND VOLCANIC FIELDS: UNDERSTANDING PROCESSES, TIMESCALES, AND THEIR INTERACTIONS II
volcanology, geochemistry and petrology | 09 december 2019
Patricia M. Gregg, Yan Zhan, Falk Amelung, Dennis ...
Forecasting volcanic unrest requires a multidisciplinary approach that links monitoring observations with dynamic models. However, connecting unrest s...
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Integrated Petrological and Geophysical Constraints on Magma System Architecture in the Western Galápagos Archipelago: Insights From Wolf Volcano
GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS
28 december 2018
Michael J. Stock, Marco Bagnardi, David A. Neave, ...
The 2015 eruption of Wolf volcano was one of the largest eruptions in the Galápagos Islands since the onset of routine satellite‐based v...
Stress Triggering of the 2005 Eruption of Sierra Negra Volcano, Galápagos
GEOPHYSICAL RESEARCH LETTERS
27 december 2018
Patricia M. Gregg, Hélène Le Mével, Yan Zhan, Jose...
Extensive vertical deformation (>4.5 m) observed at Sierra Negra volcano Galápagos, Ecuador, between 1992 and the 2005 eruption led sc...
The June 26, 2018 Eruption of Sierra Negra Volcano, Galapagos Islands, Ecuador: Pre-, Co- and Post-Eruptive Deformation from GPS Geodesy
FALL MEETING 2018
12 december 2018
Peter C. La Femina, Halldor Geirsson, Dennis Geist...
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