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<title>UTas ePrints - The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana</title>
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<meta content="Reading, A.M." name="eprints.creators_name" />
<meta content="Anya.Reading@utas.edu.au" name="eprints.creators_id" />
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<meta content="The Seismic Structure of Wilkes Land/Terre Adelie, East
Antarctica and Comparison with Australia: First Steps in
Reconstructing the Deep Lithosphere of Gondwana" name="eprints.title" />
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<meta content="A determination of the seismic structure of the crust and uppermost mantle of East Antarctica, in the region of Casey
station, Wilkes Land and Dumont DUrville station, Terre Adelie is presented. High-fidelity waveforms from teleseismic earthquakes recorded at stations CASY and DRV (1996-2001) are used to calculate the seismic receiver function, the signal produced as energy passes through layers in the seismic velocity structure under the receiving station. The receiver functions are stacked to improve the signal-to-noise ratio and then modelled using an inverse algorithm to find the structure that best fits the observed waveform at each station. Inferences are made regarding the tectonic structure,in particular, the crustal thickness and character of the seismic Moho.
The crustal thickness under Casey Station is found to be 30 km (+/- 2 km) with a fairly sharp Moho, considerably
less than Dumont D'Urville Station, where the crustal thickness is 42 km, and there IS a significant low velocity region in the deep crust. The structure of the Wilkes Land lithosphere is comparable to that of the Albany-Fraser Orogen, Western Australia, part of its conjugate margin. This places a new constraint on the relative position of East Antarctica and Australia in the reconstruction of Gondwana, and earlier, supercontinents. A recent reinterpretation of Antarctic geology proposes tectonic province boundaries trending perpendicular to the coast with counterparts in southern Australia. Seismic techniques, determining structure beneath regions with no surface exposure, are vital tools in testing such tectonic hypotheses, towards the reconstruction of Gondwana to full lithospheric depth." name="eprints.abstract" />
<meta content="2004" name="eprints.date" />
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<meta content="Gondwana Research" name="eprints.publication" />
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<meta content="Ammon, C.J. (1991) The isolation of receiver effects from
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The crustal thickness of Australia. J. Geophys. Res., v. 105, pp. 13,697-13,713.
Collins C.D.N. (1991) The nature of the crust-mantle boundary under Australia from seismic evidence. In: Drummond, B.J.(Ed.), The Australian Lithosphere, Spec. Pub. Geol. SOCA. ust., V. 17, pp. 67-80.
Condie, K.C. (2001) Continental growth during formation of
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Hawkesworth, C., Kelley, S., Turner, S., Le Roex, A. and Storey, B. (1999) Mantle processes during Gondwana break-up and dispersal. J. Afri. Earth Sci., v. 28, pp. 239-261.
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Morgan, P. (2001) The density structure of subcontinental
lithosphere through time. Earth Planet. Sci. Lett., v. 184, pp. 605-621.
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seismic structure of the Yilgarn craton, Western Australia.
Aust. J. Earth Sci. v. 50, pp. 427-438.
Ritzwoller, M.H., Shapiro, N.M., Levshin, A.L. and Leahy, G.M.(2001) Crustal and upper mantle structure beneath
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breakup: case histories from Gondwanaland. Nature, v. 377,pp. 301-308.
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van der Hilst, R.D., Kennett, B.L.N. and Shibutani, T. (1998) Upper mantle structure beneath Australia from portable array deployments. In: Structure and Evolution of the Australian Continent, Braun, J., Dooley, J., Goleby, B., van der Hilst, R.D. and Klootwijk, C. (Eds.), AGU Geodynamics Mongraphs,V. 26, pp. 39-58.
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Wessel, P., and Smith, W.H.F. (1998) New, improved, version of Generic Mapping Tools released, EOS Trans. Amer. Geophys.
Union, v. 79, p. 579." name="eprints.referencetext" />
<meta content="Reading, A.M. (2004) The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana. Gondwana Research, 7 (1). pp. 21-30. ISSN 1342-937X" name="eprints.citation" />
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<meta content="A determination of the seismic structure of the crust and uppermost mantle of East Antarctica, in the region of Casey
station, Wilkes Land and Dumont DUrville station, Terre Adelie is presented. High-fidelity waveforms from teleseismic earthquakes recorded at stations CASY and DRV (1996-2001) are used to calculate the seismic receiver function, the signal produced as energy passes through layers in the seismic velocity structure under the receiving station. The receiver functions are stacked to improve the signal-to-noise ratio and then modelled using an inverse algorithm to find the structure that best fits the observed waveform at each station. Inferences are made regarding the tectonic structure,in particular, the crustal thickness and character of the seismic Moho.
The crustal thickness under Casey Station is found to be 30 km (+/- 2 km) with a fairly sharp Moho, considerably
less than Dumont D'Urville Station, where the crustal thickness is 42 km, and there IS a significant low velocity region in the deep crust. The structure of the Wilkes Land lithosphere is comparable to that of the Albany-Fraser Orogen, Western Australia, part of its conjugate margin. This places a new constraint on the relative position of East Antarctica and Australia in the reconstruction of Gondwana, and earlier, supercontinents. A recent reinterpretation of Antarctic geology proposes tectonic province boundaries trending perpendicular to the coast with counterparts in southern Australia. Seismic techniques, determining structure beneath regions with no surface exposure, are vital tools in testing such tectonic hypotheses, towards the reconstruction of Gondwana to full lithospheric depth." name="DC.description" />
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<h1 class="ep_tm_pagetitle">The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Reading, A.M.</span> (2004) <xhtml:em>The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana.</xhtml:em> Gondwana Research, 7 (1). pp. 21-30. ISSN 1342-937X</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/1607/1/Reading_2004.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1607/1/Reading_2004.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />1479Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="2074" name="docid" accept-charset="utf-8" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1016/S1342-937X(05)70303-8">http://dx.doi.org/10.1016/S1342-937X(05)70303-8</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">A determination of the seismic structure of the crust and uppermost mantle of East Antarctica, in the region of Casey
station, Wilkes Land and Dumont DUrville station, Terre Adelie is presented. High-fidelity waveforms from teleseismic earthquakes recorded at stations CASY and DRV (1996-2001) are used to calculate the seismic receiver function, the signal produced as energy passes through layers in the seismic velocity structure under the receiving station. The receiver functions are stacked to improve the signal-to-noise ratio and then modelled using an inverse algorithm to find the structure that best fits the observed waveform at each station. Inferences are made regarding the tectonic structure,in particular, the crustal thickness and character of the seismic Moho.
The crustal thickness under Casey Station is found to be 30 km (+/- 2 km) with a fairly sharp Moho, considerably
less than Dumont D'Urville Station, where the crustal thickness is 42 km, and there IS a significant low velocity region in the deep crust. The structure of the Wilkes Land lithosphere is comparable to that of the Albany-Fraser Orogen, Western Australia, part of its conjugate margin. This places a new constraint on the relative position of East Antarctica and Australia in the reconstruction of Gondwana, and earlier, supercontinents. A recent reinterpretation of Antarctic geology proposes tectonic province boundaries trending perpendicular to the coast with counterparts in southern Australia. Seismic techniques, determining structure beneath regions with no surface exposure, are vital tools in testing such tectonic hypotheses, towards the reconstruction of Gondwana to full lithospheric depth.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Seismic structure, receiver function, East Antarctica, Australia, Gondwana.</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/260200.html">260000 Earth Sciences > 260200 Geophysics</a><br /><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences > 260100 Geology</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1607</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Mrs Katrina Keep</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">15 Aug 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">30 Jan 2008 15:33</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1607;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=1607">item control page</a></p>
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