Structure of the upper mantle under the Antarctic Plate from surface wave tomography

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 ma...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Danesi, Stefania, Morelli, Andrea
Other Authors: Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia
Format: Article in Journal/Newspaper
Language:English
Published: AGU 2001
Subjects:
Antarctic
East Antarctica
Ross Sea
The Antarctic
Antarc*
Antarctica
Online Access:http://hdl.handle.net/2122/15006
https://doi.org/10.1029/2001GL013431
Description
Summary: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. Published 4395-4398 1T. Struttura della Terra JCR Journal

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