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Two anisotropic layers in the Slave craton |
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| Authors: | D. B. Snyder M. G. Bostock G. D. Lockhart |
| Affiliation: | a Geological Survey of Canada, 615 Booth Street, Ottawa, ON, Canada K1A 0E9 b Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, BC, Canada V6T 1Z1 c BHP-Billiton, BHP Diamonds, Inc., Kelowna, BC, Canada V1X 4L1 |
| Abstract: | Four years of recording global earthquakes using a broadband seismometer located at the Ekati diamond mine revealed variations with earthquake azimuth in the arrival of SKS phases. These variations can be modeled assuming two distinct layers of anisotropy in the lithosphere. The lower layer probably lies in the mantle, and the anisotropy aligns with both North American plate motion and the strike of mantle structures identified by previous conductivity and geochemical analyses, at ˜N50°E. The upper layer is hypothesized to result from regional structures in the uppermost mantle and the crust; these trends are distinct from the mantle trends. |
| Keywords: | Seismic anisotropy Mantle structure Teleseismic studies Slave craton Lithosphere |
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