The structure of Earth's dynamic deep mantle and core-mantle boundary region
Garnero, Ed J.
published: Jan 1, 2003
ArtNo. ESP136000800045, Price: 19.00 €
In recent years, Earth's deep mantle has been shown to play an integral role in whole mantle dynamics, with connections made between lower mantle seismic velocities (and layering) with surface locations of subduction zones, hot spot volcanism, and even possible reversal paths of Earth's magnetic field. At long wavelengths (> 2000-3000 km), high velocities in the deep mantle underlie past and present subduction; low velocities are geogaphically correlated with hot spots. Also, inferences for whole mantle convection have been made from global seismic tomography. It has been noted that the shallowest and deepest mantle contain the strongest seismic heterogeneity, and that in the deepest mantle, compressional and shear velocity heterogeneity do not correlate well. Hence, we are motivated to look at deep mantle structure in greater detail.