Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..24s&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 11, pp. 24-1, CiteID 1529, DOI 10.1029/2002GL014962
Physics
11
Geodesy And Gravity: Local Gravity Anomalies And Crustal Structure, Geodesy And Gravity: Rheology Of The Lithosphere And Mantle (8160), Seismology: Lithosphere And Upper Mantle, Seismology: Surface Waves And Free Oscillations, Tectonophysics: Tomography
Scientific paper
We present constraints on the regional variations of the seismic and mechanical thickness of the Australian lithosphere. We infer the seismic thickness from a waveform tomographic model of S-wave speed, and as a proxy for the elastic thickness we use the wavelength at which the coherence of surface topography and Bouguer gravity drops below half of its long-wavelength maximum. Our results show that on scales <1000 km the relationship between the age of the crust and the thickness of the lithosphere is more complicated than longer-wavelength or global averages suggest. Recent geochemical and geodynamical evidence for small-scale secular variations of the composition and stability of continental cratons further illustrates the complexity of the age dependence of seismo-mechanical lithospheric properties on regional scales.
Simons Frederik J.
van der Hilst Rob D.
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