Attenuation Tomography of Sierra Negra Volcano Public Deposited

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Last Modified
  • March 20, 2019
Creator
  • Rodd, Rebecca
    • Affiliation: College of Arts and Sciences, Department of Geological Sciences
Abstract
  • The first fine-scale image of the shallow magma system beneath Sierra Negra is determined using attenuation tomographic methods. The t ∗ spectral decay method for P-wave phases was used to highlight regions of high Q p−1 which suggest the presence of magma melt. High Qp −1 anomalies, ranging from 0.005 − 0.04, are concentrated beneath the caldera from 0.5 − 10.5 km depths. The high attenuation is interpreted as a zone of magma accumulation. Modeling of caldera deformation indicates a magma sill or flat-topped diapir at 2.1 km depth of unknown thickness. The attenuation model supports the diapir model.
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Rights statement
  • In Copyright
Advisor
  • Lees, Jonathan
  • Biryol, Cemal
  • Rial, Jose
Degree
  • Master of Science
Degree granting institution
  • University of North Carolina at Chapel Hill Graduate School
Graduation year
  • 2016
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