117 Rankin Science South
Department of Geological and Environmental Sciences
Appalachian State University
Boone, NC 28608

Email: marshallst<at>appstate<dot>edu
Phone: 828-262-8320
For more information, view my CV

My research generally focuses on four main categories described below.

Fault Mechanics and Earthquake Science

My earthquake science research integrates Earth science with principles of physics, mathematics, and computer science to better understand how the Earth deforms in response to tectonic stresses. Earthquake-generating faults follow physical laws that can be quantified and modeled mathematically. A significant portion of my recent work has focused on creating large computer simulations of active faulting in the more complex portions of southern California.

Satellite Geodesy

I utilize modern satellite geodetic techniques including GNSS and InSAR to measure defomation at the surface of the Earth. While some of these motions are tectonic in origin, modern satellite geodetic techniques also allows us to quantify non-tectonic motions, including those driven by the water cycle, fluid extraction, and atmospheric loading.

Data Science

My research has often involved computer programming and automating data analysis and visualization, which has fostered a strong interest for data science principles. I have had the opportunity to lead several funded data science projects, where my collaborators and I have focused on automating the production of Community Earth Models (CEMs) for the Statewide California Earthquake Center (SCEC) and developed open-access web-based tools for these models. I also take great satisfaction in transforming complex, messy data into clear and insightful visualizations. For examples of some spatial data visualizations, visit my maps page where you will find a selection of geodata visualizations.

Near-Surface Geophysics

I have collaborated with various researchers on projects that utilize near-surface geophysical surveying techniques to image the subsurface. Currently, I have access to equipment for conducting Ground-Penetrating Radar (GPR), refraction seismology, and Direct Current (DC) electrical resistivity surveys. These methods are commonly used in the environmental consulting industry and provide a non-invasive approach to subsurface imaging.

Want To Get Involved?

If you are a student interested in these areas of research, I encourage you to visit my student research page for examples of past student projects and my research page for more details on my current and ongoing work. Geophysical research often involves quantitative analysis and large data sets, making computer programming key component of many projects. However, programming experience is not always a pre-requisite.