Seismic evidence for small-scale heterogeneity throughout the Earth's mantle

Article Abstract:

Geophysics research indicates low energy wave-velocity earth mantle perturbations reaching approximately eight-kilometer distances can be reduced using the amplitude structure of short-period precursors in the seismic core phase PKP. The hypothesis assumes that short-wavelength topography at the core-mantle boundary is present rather than around the mantle base as suggested in other scientific hypotheses.

Seismic waves, Geophysics

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Seismological detection of a mantle plume?

Article Abstract:

A survey conducted of the mantle below the Bowie volcano spot, western Canada, shows a zone where the seismic velocities are low. At approximately 700 km depth, the central point of the plume is 150 km northeast away from the vertically projected Bowie seamount. A mantle plume with an amplitude of the anomaly with a temperature contrast of about 300 K was discovered in the lower mantle below Bowie.

Canada, Natural history

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The chemical structure of the Hawaiian mantle plume

Article Abstract:

Electron microphobe and laser ablation inductively coupled plasma source mass spectrometry were used for examining major and trace element compositions of olivine-hosted melt inclusions from Hawaiian shield lavas. Results indicate the consistent representation of two mantle source components in all lavas and the domination of a single lava flow by one-mantle source component.

Science & research, Hawaii, Environmental aspects, Inclusions, Structure, Hawaii Island

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