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Towards continental-scale ambient noise tomography of Australia, a preliminary result from AusArray data

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Created 14/01/2025

Updated 14/01/2025

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Output type: Exploring for the Future Extended Abstract

Short Abstract: Seismic tomography has been used for more than 50 years to map the seismic velocity structure of Earth’s interior. Here, we use data from the Exploring for the Future program, AusArray 2o deployment, to perform ambient noise tomography of the Australian continent. In this approach, stacks of cross-correlations of background seismic noise recorded by pairs of seismometers are employed to extract an approximation to the surface wave trains travelling between the seismometers. We have developed a semi-automatic approach to estimate dispersion properties of surface waves as a function of frequency at 0.01 – 1 Hz and deployed the largest ever network of broadband seismometers across the country to image the continental crust of Australia. In this study, we present an ambient noise tomography map of the Australian continent at 0.4 Hz (2.5 seconds), which is sensitive to the top 3 km of the Earth’s crust. Our model shows improved resolution across the country, for example, we observed a large low-velocity anomaly (~2.5 km/s) which delineates the shape of the entire Caning basin in Western Australia. This basin has never been imaged at this detail before, as previous tomographic studies do not measure surface wave velocity up to 0.4 Hz and do not have stations deployed in this area. The outcome demonstrates the utility of the ambient noise tomography method of imaging first-order features, that could be built upon for resource potential assessments.

Citation: Hejrani B., Hassan R., Gorbatov A. & Zhao J., 2024. Towards continental-scale ambient noise tomography of Australia: a preliminary result from AusArray data. In: Czarnota, K. (ed.) Exploring for the Future: Extended Abstracts, Geoscience Australia, Canberra, https://doi.org/10.26186/149637

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Title Towards continental-scale ambient noise tomography of Australia, a preliminary result from AusArray data
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/e6e67bca-d8b1-4b22-b976-c3342ae47e69
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 06/08/2024
Geospatial Coverage {"type": "Polygon", "coordinates": [[[112.0, -44.0], [154.0, -44.0], [154.0, -9.0], [112.0, -9.0], [112.0, -44.0]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Towards continental-scale ambient noise tomography of Australia, a preliminary result from AusArray data". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/towards-continental-scale-ambient-noise-tomography-of-australia-a-preliminary-result-from-ausar

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