Variations in crustal structure across the transition from West to East Antarctica, Southern Victoria Land

S. Bannister, J. Yu, B. Leitner*, B. L.N. Kennett

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    76 Citations (Scopus)

    Abstract

    The crustal structure beneath Ross Island and the Transantarctic Mountains (TAM) in Southern Victoria Land, Antarctica, is inferred using non-linear inversion of receiver functions, derived from teleseismic earthquake data. Intermediate-period waveforms from more than 160 teleseismic earthquakes recorded between January 1994 and January 2000 were used in the analysis. The inversion results confirm a crustal thickness of 19-21 km beneath Ross Island, consistent with previous multichannel seismic work. In addition we observe a crustal thickness of 18-20 km beneath the Ross Sea coastline immediately adjacent to the TAM. Further inland, beneath the TAM, the estimated Moho depths range from 30-33 km (∼30 km from the coast) to 36-40 km (∼85 km from the coast), deepening away from the coast beneath the TAM. These results are in broad agreement with previous seismic and gravity interpretations. Beneath the TAM a sharp mid-crustal discontinuity is present at 8-14 km depth beneath the eastern-most stations, but absent on the western side of the TAM, indicating a spatial change in the mid-crustal composition.

    Original languageEnglish
    Pages (from-to)870-880
    Number of pages11
    JournalGeophysical Journal International
    Volume155
    Issue number3
    DOIs
    Publication statusPublished - Dec 2003

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