TY  - JOUR
AU  - Lynner Colton, Long Maureen D.
PY  - 2014//
TI  - Lowermost mantle anisotropy and deformation along the boundary of the African LLSVP
JO  - Geophysical Research Letters
SP  - 3447
EP  - 3454
VL  - 41
IS  - 10
KW  - lowermost mantle anisotropy
KW  - African LLSVP
KW  - discrepant SKS-SKKS splitting
KW  - 7208 Mantle
KW  - 7203 Body waves
KW  -
N2  - Shear wave splitting of SK(K)S phases is often used to examine upper mantle anisotropy. In specific cases, however, splitting of these phases may reflect anisotropy in the lowermost mantle. Here we present SKS and SKKS splitting measurements for 233 event-station pairs at 34 seismic stations that sample D″ beneath Africa. Of these, 36 pairs show significantly different splitting between the two phases, which likely reflects a contribution from lowermost mantle anisotropy. The vast majority of discrepant pairs sample the boundary of the African large low shear velocity province (LLSVP), which dominates the lower mantle structure beneath this region. In general, we observe little or no splitting of phases that have passed through the LLSVP itself and significant splitting for phases that have sampled the boundary of the LLSVP. We infer that the D″ region just outside the LLSVP boundary is strongly deformed, while its interior remains undeformed (or weakly deformed).
SN  - 1944-8007
UR  - http://dx.doi.org/10.1002/2014GL059875
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=5026), last updated on Fri, 05 Jul 2024 21:20:06 +0200
ID  - LynnerColton2014
ER  -