Graduate Students

Matthew Coble

I'm originally from Oregon, and did my undergrad at Oregon State University. I worked at the USGS for more than a year for the Earthquake Hazards Group in Menlo Park. I am currently starting my 3rd year of research at Stanford. My general research interests include volcanology, igneous petrology, and Tectonics. My PhD. research is trying to investigate if 16.5-15 Ma voluminous peralkaline silicic magmatism, exposed across in northwest Nevada and southern Oregon, is related to the impingement of a Yellowstone Plume. I am doing regional scale mapping, locating caldera sources throughout the area, argon and paleomag geochronology to establish the geologic evidence for voluminous silicic magmatism in the area. I will also be using geochemistry, Sr and Nd isotopic analyses, and Ti-in-Quartz geothermometry to better understand the petrogenesis of these peralkaline magmas and through what processes they have evolved. Out of my office, I enjoy road and mountain biking, skiing, rock climbing, hiking movies, and making beer (and drinking it). Also, I enjoy cooking, photography, and traveling.


Gwyneth Hughes

Gwyneth is originally from Baltimore, MD and attended Oberlin College where she double majored in mathematics and geology. During this time she completed an honors project on developing mathematical representations of folded surfaces with Steve Wojtal, and had the opportunity to do experimental petrology research at the Lamont-Doherty Earth Observatory with Prof. Dave Walker. After graduating, she taught mathematics at Dunbar High School in Washington D.C. for two years through the Teach for America Program. She is currently in her fifth year of the GES PhD program at Stanford and is additionally pursuing an MS in Geophysics. Gwyn's main advisor is Prof. Gail Mahood, but she also works with Prof. Paul Segall.

Areas of Interests:
Physical volcanology, mathematical modeling, structural geology, and igneous petrology

Gwyn is primarily interested in studying how magma and crust interact in volcanic systems. Current projects include (1) determining how continental crustal properties influence the formation of large silicic calderas by examining calderas worldwide and (2) utilizing deformation and seismicity to develop a model for magmatic intrusion during the 2000 Miyakejmia event. In addition, Gwyn spent two summers doing GPS work in Kamchatka with the PIRE project, studying Bezymianny volcano.

For more information about work relating to calderas, please see our 2008 publication in Geology, "Tectonic controls on the nature of large silicic calderas in volcanic arcs," v. 36, p. 627-630.
For more information about my working on Miyakejima, see the Segall Research Website


Undergraduate Advisees

Diane Raub
Charlotte Stewart-Sloan
Jamie Lynn Cundiff: Volatile contents of Cascade magmas determined on melt inclusions


Prof. Mike McWilliams
Prof. Elizabeth Miller
Prof. Dave Pollard,
Consulting Prof. Joe Wooden (and at USGS, Menlo Park),
Prof. Paul Segall,
Prof. Simon Klemperer,
Associate Professor Howard Zebker (jointly with EE)
Wes Hildreth (USGS, Menlo Park)
Prof. Andy Barth