The depth distribution of azimuthal anisotropy in the continental upper mantle

Article Abstract:

Evidence is presented for the presence of two layers of anisotropy with different fast-axis orientations in the cratonic part of the North American upper mantle. It is shown that in the western part of North America, the fast-axis direction is consistent with the absolute plate motion throughout the depth range considered, which is in agreement with a much thinner lithosphere.

North America, Analysis, Natural history, Anisotropy, Mantle (Geology), Lithosphere

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Excitation of earth's continuous free oscillations by atmosphere-ocean-seafloor coupling

Article Abstract:

An array-based method is developed to detect and locate sources of the excitation of the hum. It is concluded that the Earth's hum is generated by the interaction between atmosphere, ocean and sea floor, probably through the conversion of storm energy to oceanic infragravity waves that interact with seafloor topography.

United States, Geological research

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Global anisotropy and the thickness of continents

Article Abstract:

The depth of the continental roots, or tectosphere, of the Earth is examined. Seismologists conclude through study of global radial anisotropy that these roots extend to a depth of 250 km. The article provides supporting data in the form of seismological maps.

World, Plate tectonics

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