Ongoing deformation of Antarctica following recent Great Earthquakes
Antarctica's secular motion is thought to be almost everywhere governed by horizontal rigid plate rotation plus three-dimensional deformations due to past and present changes in ice ocean loading, known as glacial isostatic adjustment (GIA). We use geodetic data to investigate deformation follo...
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Online Access: | https://doi.org/10.1002/2016GL067773 http://ecite.utas.edu.au/106795 |
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ftunivtasecite:oai:ecite.utas.edu.au:106795 2023-05-15T13:59:47+02:00 Ongoing deformation of Antarctica following recent Great Earthquakes King, MA Santamaria-Gomez, A 2016 https://doi.org/10.1002/2016GL067773 http://ecite.utas.edu.au/106795 en eng Amer Geophysical Union http://dx.doi.org/10.1002/2016GL067773 http://purl.org/au-research/grants/arc/FT110100207 King, MA and Santamaria-Gomez, A, Ongoing deformation of Antarctica following recent Great Earthquakes, Geophysical Research Letters, 43, (5) pp. 1918-1927. ISSN 0094-8276 (2016) [Refereed Article] http://ecite.utas.edu.au/106795 Earth Sciences Geophysics Geodesy Refereed Article PeerReviewed 2016 ftunivtasecite https://doi.org/10.1002/2016GL067773 2022-05-23T22:16:44Z Antarctica's secular motion is thought to be almost everywhere governed by horizontal rigid plate rotation plus three-dimensional deformations due to past and present changes in ice ocean loading, known as glacial isostatic adjustment (GIA). We use geodetic data to investigate deformation following the 1998 M ~8.2 Antarctic intraplate Earthquake and show sustained three-dimensional deformation along East Antarctica's coastline, 600 km from the rupture location. Using a model of viscoelastic deformation, we are able to match observed northward velocity changes, and either east or height, but not all three directions simultaneously, apparently partly due to lateral variations in mantle rheology. Our modeling predicts that much of Antarctica may still be deforming, with further deformation possible from the 2004 M 8 Macquarie Ridge Earthquake. This previously unconsidered mode of Antarctic deformation affects geodetic estimates of plate motion and GIA; its viscous nature raises the prospect of further present-day deformation due to earlier Great Earthquakes. Article in Journal/Newspaper Antarc* Antarctic Antarctica eCite UTAS (University of Tasmania) Antarctic Geophysical Research Letters 43 5 1918 1927 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Geophysics Geodesy |
spellingShingle |
Earth Sciences Geophysics Geodesy King, MA Santamaria-Gomez, A Ongoing deformation of Antarctica following recent Great Earthquakes |
topic_facet |
Earth Sciences Geophysics Geodesy |
description |
Antarctica's secular motion is thought to be almost everywhere governed by horizontal rigid plate rotation plus three-dimensional deformations due to past and present changes in ice ocean loading, known as glacial isostatic adjustment (GIA). We use geodetic data to investigate deformation following the 1998 M ~8.2 Antarctic intraplate Earthquake and show sustained three-dimensional deformation along East Antarctica's coastline, 600 km from the rupture location. Using a model of viscoelastic deformation, we are able to match observed northward velocity changes, and either east or height, but not all three directions simultaneously, apparently partly due to lateral variations in mantle rheology. Our modeling predicts that much of Antarctica may still be deforming, with further deformation possible from the 2004 M 8 Macquarie Ridge Earthquake. This previously unconsidered mode of Antarctic deformation affects geodetic estimates of plate motion and GIA; its viscous nature raises the prospect of further present-day deformation due to earlier Great Earthquakes. |
format |
Article in Journal/Newspaper |
author |
King, MA Santamaria-Gomez, A |
author_facet |
King, MA Santamaria-Gomez, A |
author_sort |
King, MA |
title |
Ongoing deformation of Antarctica following recent Great Earthquakes |
title_short |
Ongoing deformation of Antarctica following recent Great Earthquakes |
title_full |
Ongoing deformation of Antarctica following recent Great Earthquakes |
title_fullStr |
Ongoing deformation of Antarctica following recent Great Earthquakes |
title_full_unstemmed |
Ongoing deformation of Antarctica following recent Great Earthquakes |
title_sort |
ongoing deformation of antarctica following recent great earthquakes |
publisher |
Amer Geophysical Union |
publishDate |
2016 |
url |
https://doi.org/10.1002/2016GL067773 http://ecite.utas.edu.au/106795 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://dx.doi.org/10.1002/2016GL067773 http://purl.org/au-research/grants/arc/FT110100207 King, MA and Santamaria-Gomez, A, Ongoing deformation of Antarctica following recent Great Earthquakes, Geophysical Research Letters, 43, (5) pp. 1918-1927. ISSN 0094-8276 (2016) [Refereed Article] http://ecite.utas.edu.au/106795 |
op_doi |
https://doi.org/10.1002/2016GL067773 |
container_title |
Geophysical Research Letters |
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43 |
container_issue |
5 |
container_start_page |
1918 |
op_container_end_page |
1927 |
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1766268585400860672 |