Lithospheric anisotropy structure inferred from collocated teleseismic and magnetotelluric observations: Great Slave Lake shear zone, northern Canada

Details Lithospheric anisotropy structure inferred from collocated teleseismic and magnetotelluric observations: Great Slave Lake shear zone, northern Canada Lithospheric anisotropy structure inferred from collocated teleseismic and magnetotelluric observations: Great Slave Lake shear zone, northern Canada

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3119614e&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 19, CiteID L19614

Physics

11

Seismology: Continental Crust (1242), Seismology: Lithosphere And Upper Mantle, Tectonophysics: Continental Tectonics-General (0905)

Scientific paper

Accurate interpretation of SKS shear-wave splitting observations requires inherently indeterminate depth information. Magnetotelluric electrical anisotropies are depth-constrained, and thereby offer possible resolution of the SKS conundrum. MT and teleseismic instruments, deployed across the Great Slave Lake shear zone, northern Canada, investigated lithospheric anisotropy and tested a hypothesis that seismic and electrical anisotropy obliquity can infer mantle strain shear-sense. Lithospheric mantle MT strike (N60°E) differs significantly from crustal MT strike (N30°E). SKS splitting vectors outside the shear zone exhibit single-layer anisotropy with fast axis parallel to upper-mantle MT strike and oblique to present-day plate motion (N135°W). Back-azimuth sensitivity at sites within the ~30 km wide shear-zone imply more complex layering, with two-layer inversion yielding an upper layer of ~N20°E and a lower layer of ~N66°E. The MT data help to constrain the depth location of SKS anisotropy and, taken together, support a model of fossil lithospheric anisotropy.

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