Product catalogue
Probabilistic Inversion of Audio Magnetotelluric Data in the East Tennant region, Northern Territory, Australia
As part of Geoscience Australia’s Exploring for the Future Program, Broadband and Audio Magnetotelluric (MT) data were acquired at 131 stations in the East Tennant region, Northern Territory, in 2019. This survey aimed to characterise major crustal structures, to map cover thickness to assist in stratigraphic drill targeting, and to help understand mineral potential in the region. The data package was released in December 2019 ( http://dx.doi.org/10.26186/5df80d8615367) and the 3D resistivity model was released in March 2020 ( https://pid.geoscience.gov.au/dataset/ga/135011).
We applied a probabilistic approach to inverting high-frequency MT data for cover thickness estimation using the 1D Rj-McMCMT code, newly developed in Geoscience Australia. The inversion employs multiple Markov chains in parallel to generate an ensemble of millions of resistivity models that adequately fit the data given the assigned noise levels. The algorithm uses trans-dimensional Markov chain Monte Carlo techniques to solve for a probabilistic resistivity-depth model. Once the ensemble of models is generated, its statistics are analysed to assess the posterior probability distribution of the resistivity at any particular depth, as well as the number of layers and the depths of the interfaces. This stochastic approach gives a thorough exploration of the model space and a more robust estimation of uncertainty than deterministic methods allow.
This release package includes the results of probabilistic inversion of Audio Magnetotelluric data at the 131 stations. They can be used to estimate cover thickness for drill site planning, and to map the base of geological basins in the region.
Model data files are large, but can be made available on request to clientservices@ga.gov.au. clientservices@ga.gov Model data files are large, but can be made available on request to clientservices@ga.gov.au.
Simple
Identification info
- Date (Creation)
- 2020-09-01
- Date (Publication)
- 2020-09-23T03:33:57
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/144339
- Citation identifier
- Digital Object Identifier/https://dx.doi.org/10.26186/144339
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Jiang, W.
Author Duan, J.
Author Brodie, R.C.
- Status
- Point of contact
-
Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Jiang, W.
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
-
Product data repository: Various Formats
- Website
-
Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- {1}
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HVC_144686
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- Sub-Topic Category
-
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Magnetotellurics
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- Discipline
-
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Geophysics
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- Project
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Exploring for the Future
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- {1}
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Published_External
-
- Project
-
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East Tennant
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
-
CC-BY
- Edition
-
4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
-
Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Associated resource
- Association Type
- Cross reference
- Title
-
East Tennant Magnetotelluric Survey, Northern Territory, Australia
- Citation identifier
- 132016
- Citation identifier
- b123934b-9f88-4a01-b88a-e873b09e5116
Associated resource
- Association Type
- Cross reference
- Title
-
Conductivity Model Derived from Magnetotelluric Data in the East Tennant Region, Northern Territory
- Citation identifier
- 135011
- Citation identifier
- bce5dc4e-db8d-4611-a117-923ce2c9fdef
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
-
Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Download model results (pdf) [265.6 MB]
Download model results (pdf) [265.6 MB]
- Distribution format
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pdf
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- OnLine resource
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Readme file (txt) [3.0 KB]
Readme file (txt) [3.0 KB]
- Distribution format
-
-
txt
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Resource lineage
- Statement
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East Tennant project is funded by the Exploring for the Future Program.
Metadata constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/0ed8959a-0e59-489d-ad88-2035aa9ce64b
- Title
-
GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
-
Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Jiang, W.
Resource provider Minerals, Energy and Groundwater Division
Type of resource
- Resource scope
- Model
- Name
-
resistivity model
Alternative metadata reference
- Title
-
Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/144339
- Date info (Creation)
- 2020-09-14T03:52:13
- Date info (Revision)
- 2020-09-14T03:52:13
Metadata standard
- Title
-
AU/NZS ISO 19115-1:2014
Metadata standard
- Title
-
ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
-
Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
-
Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/144339