New Global SH Velocity Model (SH18CEX)
Waveform tomography is conducted for SH velocity structures
of the entire mantle using approximately 3.5 times the
data used for obtaining the previous model, SH18CE.
The resultant new model, SH18CEX, exhibits a cluster of
ridge-like low-velocity anomalies in the western part of the
Pacific Large Low-Shear-Velocity Province (LLSVP).
The location of the ridge-like anomalies is in good agreement
location of the abrupt change in the topography of the D''
These results suggest that the LLSVP is associated with a cluster of
ridge-like-piles, rather than a single large pile
spread over the entire region.
The piles probably consist of intrinsically dense material;
however, either their volume or density contrast may not
be sufficiently large to develop large-scale domes.
download the model parameters (sh18cex.tar.gz)
mapview of the model SH18CEX (1)
mapview of the model SH18CEX (2)
- Takeuchi, N., 2012. Detection of ridge-like structures in the Pacific
Large Low-Shear-Velocity Province,
Earth Planet. Sci. Lett.,
- Takeuchi, N., 2007. Whole mantle SH velocity model
constrained by waveform inversion based on three-dimensional Born
kernels, Geophys. J. Int.,
older model (SH18CE)