David Graham

Research Interests

Noble Gas Geochemistry

Isotope and Trace Element Chemistry of Volcanic Rocks from Mid-Ocean Ridges, Islands, and Continental Rifts

Mantle Heterogeneity

The Effects of Volatiles in Petrogenesis

Current Research

Spatial Variations in Helium Isotopes Along Mid-Ocean Ridges

Carbon and Helium Isotope Variations in Earth's Mantle

Chris Goldfinger

Alternate phone: 541-737-5214

Specialty

Marine Geology and Geophysics, Paleoseismology

Research Interests

Subduction earthquakes; Paleoseismology. Mechanics of oblique subduction, Structural Geology, Accretion and erosion of active margins; Seafloor imaging, mapping, and visualization techniques; Seafloor drilling technology.

Gary Egbert

Specialty

Geophysics, physical oceanography

Research Interests

Electromagnetic geophysics, ocean tides, numerical modeling, statistical methods, geophysical inversion and data assimilation

Current Research

Development of practical and reliable 3D inverse methods for magnetotellurics and other EM induction data

Imaging and interpretation of continental structure with long period MT data (e.g., EarthScope)

Improving external source models for global induction studies of mantle conductivity

Robert Duncan

Research Interests

Geochronology and petrogenesis of ocean floor and oceanic island basalts applied to modeling crustal movements in the ocean basins; geochemistry of oceanic basalts to map upper mantle heterogeneities; hydrothermal alteration of midocean ridge basalts; the origin, composition, timing and environmental effects of large igneous processes.

John Dilles

Specialty

Geology and geochemistry of mineral deposits, field geology

Research Interests

Economic geology (origin of metallic mineral deposits, especially porphyry copper and related deposits of western North America and South America), structural geology, igneous petrology, stable isotopes, isotopic ages

Education

BS Geology, California Institute of Technology, Pasadena, 1975
MS Geology, California Institute of Technology, Pasadena, 1976
PhD Geology, Stanford University, 1984

Roland de Szoeke

Professor Emeritus Roland de Szoeke passed away in the third week of December, 2025. See the In Memory page for more information.


Research Interests

Upper-ocean and mixed-layer dynamics; global ocean circulation; large-scale heat transport in the ocean; coastal upwelling; the Atlantic circumpolar current.

G. Brent Dalrymple

Research Interests

Radiometric dating methods, esp. 40Ar/39Ar techniques
Geomagnetic field behavior, esp. Polarity reversals
History and timing of volcanic events
Impact history on the early Moon
Age of the Earth

Education

A.B., Geology, Occidental College, 1959
Ph.D., Geology, University of California, Berkeley, 1963