On the Relationship Between Oceanic Plate Speed, Tectonic Stress, and Seismic Anisotropy.

ABSTRACT: Seismic radial anisotropy (the squared ratio between the speeds of horizontally and vertically polarized shear waves, ξ=VSH2VSV2 ) is a powerful tool to probe the direction of mantle flow and accumulated strain. While previous studies have confirmed the dependence of azimuthal anisotropy on plate speed, the first order control on radial anisotropy is unclear. In this study, we develop 2D ridge flow models combined with mantle fabric calculations to report that faster plates generate higher tectonics stresses and strain rates which lower the dislocation creep viscosity and lead to deeper anisotropy than beneath slower plates. We apply the SGLOBE-rani tomographic filter, resulting in a flat depth-age trend and stronger anisotropy beneath faster plates, which correlates well with 3D global an

SUBMITTER: Kendall E 

PROVIDER: S-EPMC9539886 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature