Structure of the upper mantle under the Antarctic Plate from surface wave tomography
- 1 December 2001
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 28 (23) , 4395-4398
- https://doi.org/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.This publication has 17 references indexed in Scilit:
- Crustal and upper mantle structure beneath Antarctica and surrounding oceansJournal of Geophysical Research, 2001
- Group velocity of Rayleigh waves in the Antarctic regionPhysics of the Earth and Planetary Interiors, 2000
- Shear‐wave velocities under the Transantarctic Mountains and terror rift from surface wave inversionGeophysical Research Letters, 2000
- Crustal and lithospheric structure of the West Antarctic Rift System from geophysical investigations — a reviewGlobal and Planetary Change, 1999
- Source effects on surface wave group travel times and group velocity mapsPhysics of the Earth and Planetary Interiors, 1999
- Global high-resolution phase velocity distributions of overtone and fundamental-mode surface waves determined by mode branch strippingGeophysical Journal International, 1999
- Upper mantle heterogeneities in the Indian Ocean from waveform inversionGeophysical Research Letters, 1997
- Antarctica II: Upper-mantle structure from velocities and anisotropyPhysics of the Earth and Planetary Interiors, 1994
- Generalized nonlinear inverse problems solved using the least squares criterionReviews of Geophysics, 1982
- Preliminary reference Earth modelPhysics of the Earth and Planetary Interiors, 1981