Constraints from seismic anisotropy on the nature of the lowermost mantle

Article Abstract:

Horizontal layering of a material or its aligned inclusions that have different shear-wave velocities is the likely cause of seismic anisotropy in the lowermost mantle of the Earth which is called the D" discontinuity area. The D" region is 250 km above the core-mantle boundary. Seismic waves observations and seismic tomography has helped in presenting evidence for the study. Two mechanisms based on descent of slabs into lower mantle and reaction-zone hypothesis used to explain seismological properties of the layered D" region are described.

Usage, Observations, Anisotropy, Seismic waves, Seismic tomography

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Global correlations of mid-ocean-ridge basalt chemistry with seismic tomographic images

Article Abstract:

Mid-ocean basalt chemistry and seismic tomography correlate in identifying lateral thermal variations in the Earth's upper mantle. This suggests that the two data sets have a common thermal origin and reinforces their validity. The correlation holds between 100 and 170 km deep and on scale lengths of 1,000 to 2,000 km. Several data points do not correlate, due to either genuine discrepancies or limited tomographic resolution.

Environmental aspects, Heat, Earth temperature, Earth's temperature, Convection (Fluid dynamics)

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Tomographic imaging of molecular orbital

Article Abstract:

An attempt is made to demonstrate that full three-dimensional structure of a single orbital can be imaged by an unlikely technique using high harmonics generated from intense femtosecond laser pulses focused on aligned molecules. A tomographic reconstruction of the highest occupied molecular orbital of N (sub 2) is accomplished by applying an approach to a series of molecular alignments.

Science & research, Laser pulses, Ultrashort, Ultrashort laser pulses, Molecular orbitals, Wave functions

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