Authors / CoAuthors
B. Hejrani | R. Hassan | A. Gorbatov | J. Zhao | Czarnota, K.
Abstract
<div><strong>Output type: </strong>Exploring for the Future Extended Abstract</div><div><br></div><div><strong>Short Abstract: </strong>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.</div><div><br></div><div><strong>Citation: </strong>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</div>
Product Type
document
eCat Id
149637
Contact for the resource
Resource provider
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
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Digital Object Identifier
Keywords
- ( Project )
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- EFTF – Exploring for the Future
- ( Project )
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- Australia’s Resources Framework
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- Passive Seismic imaging
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- Ambient Noise Tomography
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- AusArray
- theme.ANZRC Fields of Research.rdf
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- Seismology and seismic exploration
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- Published_External
Publication Date
2024-08-11T22:56:49
Creation Date
2024-05-23T22:00:00
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Status
completed
Purpose
This is an extended abstract for EFTF program.
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
<div>This is an extended abstract for the EFTF program. </div>
Parent Information
Extents
[-44.00, -9.00, 112.00, 154.00]
Reference System
Spatial Resolution
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Associations
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