Dr Imran Sheikh
This internship took place at Brown University and was sponsored by the Incorporated Research Institutions for Seismology (IRIS) Undergraduate Internship program. In it, I had the opportunity to examine surface wave propagation beneath Alaska in order to make some statements about how features in the lithosphere and upper mantle affect surface geology in the state. The end goal of this project was to create a number of tomographic maps, and possibly image seismic attenuation/ dampening in certain areas as well. Seismic tomography is a passive source seismology method that uses wave arrival times to an array of evenly spaced seismic stations to locate potential anomalies and compositional differences based on relative wave speeds. Since waves propagate at different speeds through materials of different compositions, seismologists can infer properties of materials in the subsurface from the resulting maps. Surface wave wave speed is linked to features like temperature, composition, and the presence of partial melt in the subsurface. As such, these measurements can relate visible geologic features to the underlying lithosphere.
Jones, Ulla, "Brown University - Rayleigh Wave Tomography of Alaska" (2022). College of the Environment Internship Reports. 41.
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