Journal
SCIENCE
Volume 343, Issue 6176, Pages 1237-1240Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1246724
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Funding
- NSF EAR [0838605, 0949255, 1247608]
- Directorate For Geosciences [0949255, 0838605] Funding Source: National Science Foundation
- Division Of Earth Sciences [0949255, 0838605] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1247608] Funding Source: National Science Foundation
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The boundary between the lithosphere and asthenosphere is associated with a platewide high-seismic velocity lid overlying lowered velocities, consistent with thermal models. Seismic body waves also intermittently detect a sharp velocity reduction at similar depths, the Gutenberg (G) discontinuity, which cannot be explained by temperature alone. We compared an anisotropic tomography model with detections of the G to evaluate their context and relation to the lithosphere-asthenosphere boundary (LAB). We find that the G is primarily associated with vertical changes in azimuthal anisotropy and lies above a thermally controlled LAB, implying that the two are not equivalent interfaces. The origin of the G is a result of frozen-in lithospheric structures, regional compositional variations of the mantle, or dynamically perturbed LAB.
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