Validation of a Tilted Transversely Isotropic Model of Alaska Using 3D Seismic Wavefield Simulations
Description:
Seismic imaging of Earth's subsurface structure is challenging because the seismic stations are only located at the surface, and because the number of stations is generally sparse in comparison with the degree of heterogeneity, especially within the Earth's crust. This results in an underdetermined inverse problem, whereby there is not enough data to uniquely resolve the unknown model parameters. The seismic imaging problem is even more challenging because there are portions of the Earth, such as sedimentary strata, metamorphic terranes, oceanic crust, and cracked/dilated materials that exhibit elasticity that is transversely isotropic (TI). The symmetry axis of the TI material can be vertical (VTI), horizontal (HTI), or arbitrarily tilted (TTI). Using 3D wavefield simulations of regional earthquakes and ambient noise cross-correlation functions, we examine a recently published TTI model for Alaska. We also calculate the closest HTI, closest VTI, and closest isotropic models to the TTI model, and then perform wavefield simulations within these models to better understand which regions of complex anisotropy are required by seismic observations.
Session: Earth’s Structure from the Crust to the Core [Poster]
Type: Poster
Date: 4/16/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Aakash
Student Presenter: Yes
Invited Presentation:
Poster Number: 96
Authors
Aakash Gupta Presenting Author Corresponding Author agupta7@alaska.edu University of Alaska Fairbanks |
Carl Tape ctape@alaska.edu University of Alaska Fairbanks |
Chuanming Liu chuanming.liu@jsg.utexas.edu University of Texas at Austin |
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Validation of a Tilted Transversely Isotropic Model of Alaska Using 3D Seismic Wavefield Simulations
Category
Earth’s Structure from the Crust to the Core