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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
S-velocity model and inferred Moho topography beneath the Antarctic Plate from Rayleigh waves
Journal of Geophysical Research: Solid Earth, Volume 120, No. 1, Year 2015
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Description
Since 2007/2008, seismographs were deployed in many new locations across much of Antarctica. Using the records from 122 broadband seismic stations, over 10,000 Rayleigh wave fundamental-mode dispersion curves have been retrieved from earthquake waveforms and from ambient noise. Using the processed data set, a 3-D S-velocity model for the Antarctic lithosphere was constructed using a single-step surface wave tomographic method, and a Moho depth map was estimated from the model. Using the derived crustal thicknesses, the average ratio of lithospheric mantle and crustal densities of Antarctica was calculated. The calculated density ratio indicates that the average crustal density for Antarctica is much higher than the average values for continental crust or the average density of lithospheric mantle is so low as to be equal to low-density bound of Archean lithosphere. The latter implies that the lithospheric mantle in much of Antarctica should be old and of Archean age. The East Antarctic Mountain Ranges (EAMOR) represent a thick crustal belt, with the thickest crust (∼60 km) located close to Dome A. Very high velocities can be found at depths greater than 200 km beneath parts of East Antarctica, demonstrating that the continental lithosphere extends deeper than 200 km. The very thick crust beneath the EAMOR may represent the collision suture of East Gondwana with Indo-Antarctica and West Gondwana during the Pan-African orogeny. © 2014. American Geophysical Union. All Rights Reserved.
Authors & Co-Authors
Wiens, Douglas A.
United States, St. Louis
Washington University in St. Louis
Zhao, Yue
China, Beijing
Chinese Academy of Geological Sciences
Nyblade, Andrew A.
United States, University Park
Pennsylvania State University
Maggi, Alessia
France, Paris
Cnrs Centre National de la Recherche Scientifique
Lévêque, Jean Jacques
France, Paris
Cnrs Centre National de la Recherche Scientifique
Statistics
Citations: 138
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1002/2014JB011332
ISSN:
21699313