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Sea level rise and land level change at Macquarie Island and deformation of the Australia-Pacific plate boundary zone

Citation

Burgette, RJ, Sea level rise and land level change at Macquarie Island and deformation of the Australia-Pacific plate boundary zone, School of Geography & Environmental Studies Conference Abstracts 2010, 28 June 2010, Sandy Bay (2010) [Conference Extract]

Abstract

Through the combination of rare historical sea level observations collected during Sir Douglas Mawson’s 1911-1914 Australasian Antarctic Expedition, together with modern sea level data, space geodetic estimates of crustal displacement and modeling of coseismic and postseismic earthquake deformation, we present a contemporary analysis to constrain sea level and land level change over the twentieth century at Macquarie Island. We refine the source parameters of the Mw ~8.0 great earthquake of 23 December 2004 using estimates of coseismic displacements at regional GPS sites including HOB2 in Hobart. Modelling four years of post-2004.98 deformation constrains the oceanic upper mantle rheology. The 2000-2005 Macquarie Island GPS vertical velocity of -2.46 ± 0.64 mm/y is explained by ongoing postseismic deformation from Macquarie Ridge great earthquakes of 1989 and 1924. The twentieth century observed relative sea level rise of +4.8 ± 0.6 mm/y is consistent with an absolute sea level rise of +2.0 ± 0.8 mm/y.

Item Details

Item Type:Conference Extract
Keywords:Macquarie Island, sea level rise, plate boundaries
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Photogrammetry and Remote Sensing
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Burgette, RJ (Dr Reed Burgette)
ID Code:65545
Year Published:2010
Deposited By:Geography and Environmental Studies
Deposited On:2010-11-22
Last Modified:2010-11-22
Downloads:0

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