Mantle flow in the South Sandwich subduction environment from source-side shear wave splitting

Details Mantle flow in the South Sandwich subduction environment from source-side shear wave splitting Mantle flow in the South Sandwich subduction environment from source-side shear wave splitting

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3503301m&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 3, CiteID L03301

Physics

4

Seismology: Mantle (1212, 1213, 8124), Seismology: Subduction Zones (1207, 1219, 1240), Mineralogy And Petrology: Mantle Processes (1038), Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)

Scientific paper

The occurrence of seismic anisotropy in the Earth's upper mantle is a global phenomenon related to subcrustal deformation and flow processes. The shear wave splitting analysis method has led to a global set of anisotropy maps mainly derived from receiver-side analysis. Remote places with few seismometers deployed remain unexamined. Source-side splitting analysis allows mapping of mantle fabrics in these regions. Here, we investigate seismic anisotropy in the South Sandwich Islands subduction environment. Core-reflected ScS waves recorded at the Neumayer seismograph network are corrected for well constrained receiver anisotropy and then analysed for source anisotropy. Sub-slab mantle minerals are aligned horizontally almost parallel to the trench indicating a westward flow around the subducting slab. This is consistent with a model of horizontal mantle flow due to slab rollback that was previously inferred from marine and geochemical studies in the back-arc region.

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