Seismic imaging of the upper mantle under the Erebus hotspot in Antarctica

Sandeep Gupta, Dapeng Zhao, S. S. Rai

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

P-wave velocity images are determined under the Mount Erebus volcano, Antarctica by using teleseismic tomography. Our results show a prominent low-velocity (low-V) anomaly of nearly circular symmetry (about 250-300 km in diameter) to about 200 km depth under the Mount Erebus volcanic region, which further extends down to ~ 400 km as a narrow tilted column. The observed low-V anomaly beneath the Mount Erebus volcano can be expression of a thermal anomaly of deep origin. Combining the seismically imaged thermal anomaly with geochemical observation of rift-related volcanism in the region, we consider that the Mount Erebus is a hotspot due to West Antarctic Rift System linked with a mantle plume. In addition, high-velocity anomalies are imaged beneath the East Antarctic craton, being consistent with the previous studies.

Original languageEnglish
Pages (from-to)109-118
Number of pages10
JournalGondwana Research
Volume16
Issue number1
DOIs
Publication statusPublished - 2009 Aug

Keywords

  • Antarctica
  • Hotspot
  • Mt. Erebus
  • Teleseismic tomography

ASJC Scopus subject areas

  • Geology

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