EGU2020-12595
https://doi.org/10.5194/egusphere-egu2020-12595
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

High-resolution constraints on LAB structure at the Blanco transform

William Hawley1 and James Gaherty1,2
William Hawley and James Gaherty
  • 1Columbia University, Lamont-Doherty Earth Observatory, Palisades, NY, United States of America (whawley@ldeo.columbia.edu)
  • 2Northern Arizona University, Flagstaff, AZ, United States of America

Detailed knowledge of the seismic structure, fabric, and dynamics that surround the oceanic LAB continue to be refined through offshore seismic studies. Previous high-resolution studies in the Pacific basin far from plate boundaries show asthenospheric fabric that aligns neither with the lithospheric fabric (the paleo-spreading direction) nor with absolute plate motion, but rather in between. Here we present preliminary results from the Blanco Transform and Cascadia Initiative experiments, investigating the structure of the Juan de Fuca and Pacific plates on either side of the Blanco Transform. We measure ambient-noise and teleseismic Rayleigh-wave phase velocities, and solve for the period-dependent azimuthal anisotropy on either side of the transform. We will contextualize and interpret the fabrics based on mantle flow inferred from these previous Pacific basin studies. 

How to cite: Hawley, W. and Gaherty, J.: High-resolution constraints on LAB structure at the Blanco transform, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12595, https://doi.org/10.5194/egusphere-egu2020-12595, 2020

This abstract will not be presented.