Journal Article10.1016/J.PEPI.2003.09.004
Mantle tomography and its relation to temperature and composition
TL;DR: In this paper, a new method was proposed to constrain lateral variations of temperature and composition in the lower mantle from global tomographic models of shear and compressional-wave speed.
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About: This article is published in Physics of the Earth and Planetary Interiors. The article was published on 30 Dec 2003. The article focuses on the topics: Seismic tomography.
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Citations
Lowermost mantle thermal conductivity constrained from experimental data and tomographic models
TL;DR: In this paper, the authors used 3-D thermochemical models from probabilistic tomography, which include variations in temperature, iron content, and bridgmanite fraction, to calculate possible maps of conductivity anomalies at the bottom of the mantle and find that these variations are dominated by lateral temperature anomalies and are only partly affected by changes in thermal conductivity.
Deep Mantle Seismic Modeling and Imaging
Thorne Lay,Edward J. Garnero +1 more
TL;DR: In this paper, multichannel seismic wave analysis methods that provide the highest-resolution deep mantle structural information include network waveform modeling and stacking, array processing, and 3D migrations of P- and S-wave seismograms.
References
Numerical recipes
TL;DR: This section discusses a particular type of low-pass filter, well-adapted for data smoothing, and termed variously Savitzky-Golay, least-squares, or DISPO (Digital Smoothing Polynomial) filters.
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Constraints on seismic velocities in the Earth from traveltimes
TL;DR: In this article, a new empirical traveltime curves for the major seismic phases have been derived from the catalogues of the International Seismological Centre by relocating events by using P readings, depth phases and the iasp91 traveltimes, and then re-associating phase picks.
Compositional stratification in the deep mantle
TL;DR: A boundary between compositionally distinct regions at a depth of about 1600 kilometers may explain the seismological observations pertaining to Earth's lower mantle, produce the isotopic signatures of mid-ocean ridge basalts and oceanic island basalts, and reconcile the discrepancy between the observed heat flux and the heat production of the mid-Ocean ridge basalt source region.
The Relative Behavior of Shear Velocity, Bulk Sound Speed, and Compressional Velocity in the Mantle: Implications for Chemical and Thermal Structure
TL;DR: In this article, the relative amplitudes of compressional and shear velocity anomalies in the lower mantle are investigated and some robust patterns are beginning to emerge which allow us to identify regions of the lower lower mantle which are anomalous.
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Seismic Evidence for Partial Melt at the Base of Earth's Mantle
TL;DR: The presence of an intermittent layer at the base of Earth9s mantle with a maximum thickness near 40 kilometers and a compressional wave velocity depressed by ∼10 percent compared with that of the overlying mantle is most simply explained as the result of partial melt at this depth.