Authors / CoAuthors
Gorbatov, A. | Saygin, E.
Abstract
Tomographic images of Southeast Asia and Australia were created by inverting the travel-times of the Rayleigh wave Green's functions retrieved from cross-correlations of the ambient seismic noise. The travel-times of the Green's functions are inverted with a nonlinear two dimensional inversion scheme to map the seismic velocity perturbations of the Earth. Continuous records from the vertical components of 187 permanent broad-band seismic stations operated from 2007 to 2008 are processed. We limit our picks only for Green's functions with interstation separation between 1o and 60o. This ensures that only wide scale anomalies are included in the tomographic inversions. By employing a nonlinear wavefront tracker for the forward problem, we avoid the artefacts of the deviations from the great circle path assumptions for very long interstation paths. We conduct dispersion measurements of group velocities between 6 and 50 seconds by narrowly filtering the envelopes of the extracted Green's functions. The Rayleigh waves for the selected periods sample the Earth from upper-crust (~9 km) to uppermost mantle (~90 km). The tomographic images reveal heterogeneous structure of Australia marking major sediment deposits on shallow layers and the high-velocity structure of the Western Australia cratons composed of ancient Archaean and Proterozoic blocks. Low velocity zones in deeper layers correlate well with the areas of high heat flow and agree with the results of recent surface wave tomographic studies. The Sunda Arc is characterized by prominent low-velocity zones located below the western tip of Java, Java Sea, and Banda Sea for longer periods.
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nonGeographicDataset
eCat Id
69433
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Keywords
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- External Publication
- ( Theme )
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- 3D model
- ( Theme )
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- seismology
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2009-01-01T00:00:00
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