S-velocity model and inferred Moho topography beneath the Antarctic Plate from Rayleigh waves

Meijian An, Douglas A. Wiens, Yue Zhao, Mei Feng, Andrew A. Nyblade, Masaki Kanao, Yuansheng Li, Alessia Maggi, Jean Jacques Lévêque

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)359-383
Number of pages25
JournalJournal of Geophysical Research: Solid Earth
Volume120
Issue number1
DOIs
StatePublished - Jan 2015

Fingerprint

Rayleigh waves
Rayleigh wave
Antarctic regions
Moho
Topography
topography
Seismographs
Domes
lithosphere
Surface waves
crusts
Earthquakes
Earth mantle
mantle
mountains
Gondwana
Archean
crust
Pan African orogeny
ambient noise

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

An, Meijian ; Wiens, Douglas A. ; Zhao, Yue ; Feng, Mei ; Nyblade, Andrew A. ; Kanao, Masaki ; Li, Yuansheng ; Maggi, Alessia ; Lévêque, Jean Jacques. / S-velocity model and inferred Moho topography beneath the Antarctic Plate from Rayleigh waves. In: Journal of Geophysical Research: Solid Earth. 2015 ; Vol. 120, No. 1. pp. 359-383.
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S-velocity model and inferred Moho topography beneath the Antarctic Plate from Rayleigh waves. / An, Meijian; Wiens, Douglas A.; Zhao, Yue; Feng, Mei; Nyblade, Andrew A.; Kanao, Masaki; Li, Yuansheng; Maggi, Alessia; Lévêque, Jean Jacques.

In: Journal of Geophysical Research: Solid Earth, Vol. 120, No. 1, 01.2015, p. 359-383.

Research output: Contribution to journalArticle

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AU - An, Meijian

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AU - Zhao, Yue

AU - Feng, Mei

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AU - Kanao, Masaki

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