Project Overview
Deep Earth Imaging of the Alaskan Subduction Zone
Department(s)
Earth and Environmental Geosciences
Abstract
The southern margin of Alaska is one of the most volcanically and seismically (earthquakes) active areas of the world, and is home to one of the largest subduction zones on Earth. Tremendous variability is observed, however, from east to west along the boundary. Some areas generate record-breaking earthquakes, while others are relatively quiescent. This variability leads to several important - yet unanswered - questions about the dynamics and hazards of the Alaskan subduction zone. For example – what factors control the type of movement along the subduction interfaces, with massive earthquakes in some areas and creeping boundaries in other areas? How are fluids and gasses transported through the system, and how do they influence volcanic and seismic behavior? How variable is flow within the mantle, and does this influence tectonic, volcanic, and seismic behavior?
To study these critical questions, data on ground motion was collected in a large collaborative experiment from 2018-2019, using 105 seismometers on land and at the bottom of the ocean. Student researchers are invited to dive into this unprecedented dataset, working to build a model of how the Alaskan subduction zone works deep inside the earth. To build this model, students will use a technique called seismic tomography, which is similar to CAT scans from the medical field - only it images the inside of the earth using earthquake waves instead of light waves! The primary goals of this summer research experience are to examine earthquake signals and to refine a computer model of the earth beneath Alaska.
Earthquake data is digital, so day-to-day research will be primarily computer based, using Linux and Matlab. Prior experience with Matlab and Linux is recommend for this research project due to the shorter duration of the research experience this year.
Student Qualifications
Experience with Linux or Unix computing and Matlab. Two geology classes preferred.
Number of Student Researchers
2 students
Project Length
4-5 weeks