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Ongoing deformation of Antarctica following recent Great Earthquakes
Citation
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]
Copyright Statement
Copyright 2016 American Geophysical Union
Abstract
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.
Item Details
Item Type: | Refereed Article |
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Keywords: | postseismic deformation, Antarctica, GPS, DORIS |
Research Division: | Earth Sciences |
Research Group: | Geophysics |
Research Field: | Geodesy |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | King, MA (Professor Matt King) |
UTAS Author: | Santamaria-Gomez, A (Dr Alvaro Santamaria-Gomez) |
ID Code: | 106795 |
Year Published: | 2016 |
Funding Support: | Australian Research Council (FT110100207) |
Web of Science® Times Cited: | 20 |
Deposited By: | Geography and Spatial Science |
Deposited On: | 2016-02-22 |
Last Modified: | 2022-05-19 |
Downloads: | 0 |
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