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Authors: | Danesi, Stefania* Morelli, Andrea* |
Title: | Structure of the upper mantle under the Antarctic Plate from surface wave tomography | Journal: | Geophysical Research Letters | Series/Report no.: | 23/28 (2001) | Publisher: | AGU | Issue Date: | 2001 | DOI: | 10.1029/2001GL013431 | Abstract: | We have analyzed surface wave data for 245 events occurring in Antarctica and surrounding oceans during years 1991-1999. We first apply dispersion analysis to the fundamental mode of Rayleigh waves for periods ranging from 20 to 150 sec. We then invert path-averaged dispersion curves to obtain 2D maps of group velocity for different periods, represented by splines on a grid with 250 km spacing, with considerably more detail than that achieved by global models. We finally use group velocity maps in a nonlinear inversion for the regional 3D υSV structure of the upper mantle. The resulting model shows thick continental roots under East Antarctica, reaching depths below 200 km; low velocities under oceanic ridges, mostly confined to the upper 150 km; and a slow area under the Ross Sea volcanic centres, extending all the way down to 200 km, beyond which our data loose resolving power. |
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