Upper mantle shear wave velocity structure in the southeastern United States from Rayleigh wave tomography

Public Deposited
Analytics

Downloadable Content

Download PDF
Request Version for Screen Reader
Last Modified
  • February 26, 2019
Creator
  • Howell, Dorran K.
    • Affiliation: College of Arts and Sciences, Department of Geological Sciences
Abstract
  • We present a model of upper mantle shear wave velocity in the southeastern United States from Rayleigh Wave tomography that images the proposed Suwannee suture in southern Georgia. We use data that were recorded by the SESAME (the Southeastern Suture of the Appalachian Margin Experiment) seismic network and nearby EarthScope Transportable Array and permanent broadband stations. Preliminary results indicate a consistent depth to the lithosphere-asthenosphere boundary (LAB) across the Suwanee suture. We identify two zones of anomalously low shear wave velocity: one within the mantle lithosphere of the Suwannee Terrane that spans depths from the Moho to ~105km and a second zone beneath the southernmost Appalachians. These low velocities beneath Suwannee are likely due to the presence of water from subduction-related processes. This is consistent with Laurentia having been subducted beneath Suwannee Terrane during accretion (McBride and Nelson, 1988). The LAB depth is ambiguous for low velocity areas beneath the Appalachians, and further analysis is needed before this structure can be characterized.
Date of publication
Keyword
DOI
Resource type
Rights statement
  • In Copyright
Note
  • Funding: None
Advisor
  • Wagner, Lara
Degree
  • Bachelor of Science
Honors level
  • Honors
Degree granting institution
  • University of North Carolina at Chapel Hill
Extent
  • 57

Relations

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details Thesis 2019-05-18 Public Download
file details VsISOsurface.avi 2019-05-18 Public Download
file details 8284dVsISOsurface.avi 2019-05-18 Public Download
file details 8486dVsISOsurface.avi 2019-05-18 Public Download