Geology Reference
In-Depth Information
Fig. 1.15
Shear wave velocity (
v
s
) and density (
¡
)
anomalies in the lower mantle, based on the seismic
tomography model of Trampert et al. (
2004
). The lower
mantle has been subdivided in three layers, respectively
from 2,000 to 2,891 km (
lower panels
), from 1,200 to
2,000 km (
middle panels
), and from 670 to 1,200 km
(
top
).
A
and
P
are, respectively, the African and the Pacific
superplumes
Fig. 1.16
Thermal (•
T
) and composition (•Pv and •Fe)
anomalies in the lower mantle, based on the seismic
tomography model of Trampert et al. (
2004
). The subdivi-
sion of the lower mantle is the same of Fig.
1.15
. •Pv and
•Fe are, respectively, the relative variation of perovskite
andironcontent
