Reactivation of ancient Antarctic rift zones by intraplate seismicity

Amanda C. Lough, Douglas A. Wiens, Andrew Nyblade

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Buried deep beneath the Antarctic polar ice sheet, the geological structure and tectonic activity of East Antarctica have long remained unknown. The apparent lack of tectonic seismicity was thought to be anomalous relative to other continental interiors and has been attributed to a lack of intraplate stress due to the surrounding spreading ridges and low absolute plate velocity or to the weight of ice sheets increasing the normal stress. Here we report 27 intraplate tectonic earthquakes detected by the AGAP/GAMSEIS seismic array during 2009 in the interior of East Antarctica, which represents locally recorded seismicity in the region. The earthquakes are primarily extensional and located at shallow to mid-crustal depths beneath sedimentary basins aligned linearly adjacent to the Gamburtsev Subglacial Mountains. The basins may be part of an ancient continental rift system, which provides a zone of pre-existing tectonic weakness that focuses the seismicity. These events, when combined with events in published catalogues of Antarctic seismicity, indicate levels of seismicity in East Antarctica of the same order of magnitude as that of other stable cratons, such as the Canadian Shield.

Original languageEnglish (US)
Pages (from-to)515-519
Number of pages5
JournalNature Geoscience
Volume11
Issue number7
DOIs
StatePublished - Jul 1 2018

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rift zone
reactivation
seismicity
tectonics
ice sheet
continental interior
earthquake
geological structure
sedimentary basin
craton
shield
mountain
basin
Antarctica

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

Lough, Amanda C. ; Wiens, Douglas A. ; Nyblade, Andrew. / Reactivation of ancient Antarctic rift zones by intraplate seismicity. In: Nature Geoscience. 2018 ; Vol. 11, No. 7. pp. 515-519.
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Reactivation of ancient Antarctic rift zones by intraplate seismicity. / Lough, Amanda C.; Wiens, Douglas A.; Nyblade, Andrew.

In: Nature Geoscience, Vol. 11, No. 7, 01.07.2018, p. 515-519.

Research output: Contribution to journalArticle

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