Towards a Model of Radial Anisotropy in the East Asian Lithosphere
Abstract
Observations of radial anisotropy provide important constraints on mantle flow, and help to elucidate complex tectonic settings such as those found in East Asia, which finds itself at the confluence of subducting slabs and continental collision. We present a new, high-resolution 3D model of radial anisotropy of the lithosphere in East Asia based on measurements of Rayleigh and Love wave group velocity dispersion curves that were derived from earthquakes and ambient noise cross-correlations based on 3.5 years of continuous 3-component broadband data from over 1000 seismic stations in regional networks across China, Korea, and Japan. We also combine our measurements with previously published datasets of fundamental mode phase and group velocities along with overtone phase velocities. The inclusion of short-period ambient-noise-derived dispersion allows us to constrain shallow crustal structure and prevents it from contaminating images of mantle structure, while the longer period fundamental and higher mode earthquake-based measurements allow us to obtain high-resolution images of mantle anisotropy.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMDI12A..02W
- Keywords:
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- 3902 Creep and deformation;
- MINERAL PHYSICSDE: 7208 Mantle;
- SEISMOLOGYDE: 8120 Dynamics of lithosphere and mantle: general;
- TECTONOPHYSICSDE: 8170 Subduction zone processes;
- TECTONOPHYSICS