Product catalogue
Large earthquake recurrence on the Willunga Fault, South Australia
<div>In mid-2022 two paleoseismic trenches were excavated across the Willunga Fault at Sellicks Hill, ~40 km south of Adelaide, at a location where range front faulting displaces a thick colluvial apron, and flexure in the hanging wall has produced an extensional graben. Vertical separation between time-equivalent surfaces within the Willunga Embayment and uplifted Myponga Basin indicate an average uplift rate of 40 m/Myr since 5 Ma across the Willunga fault at the trench location, equivalent to a slip rate of 57 m/Myr across a 45° dipping fault. </div><div>
The field sites preserve evidence for at least 4-5 large earthquake events involving approximately 6.9 m of discrete slip on fault planes since the Mid to Late Pleistocene. If the formation of red soil marker horizons in the trenches are assumed to relate to glacial climatic conditions then a slip-rate of 26-46 m/Myr since the Mid Pleistocene is obtained. These deformation rate estimates do not include folding in the hanging wall of the fault, which is likely to be significant at this site as evidenced by the existence of a pronounced hanging wall anticline. In the coming months, the results of dating analysis will allow quantitative constraint to be placed on earthquake timing and slip-rate, and a structural geological study seeks to assess the proportion of deformation partitioned into folding of the hanging wall.</div><div>
The 2022 trenches represent the most recent of ten excavated across this fault. Integration of the 2022 data with those from previous investigations will allow fundamental questions to be addressed, such as whether the Willunga fault ruptures to its entire length, or in a segmented fashion, and whether any segmentation behaviour is reflected in local slip-rate estimates. Thereby we hope to significantly improve our understanding of the hazard that this, and other proximal Quaternary-active faults, pose to the greater Adelaide conurbation and its attendant infrastructure.</div>
This paper was presented to the 2022 Australian Earthquake Engineering Society (AEES) Conference 24-25 November ( https://aees.org.au/aees-conference-2022/)
Simple
Identification info
- Date (Creation)
- 2022-10-08T20:00:00
- Date (Publication)
- 2023-02-24T00:04:54
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/147282
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Clark, D.
Internal Contact Author Griffin, J.
Internal Contact Author la Greca, J.
External Contact Author Quigley, M.
External Contact Author Sellmann, S.
External Contact Author Ninis, D.
External Contact Author Kuang, K.
External Contact Author Wilson, A.
External Contact
- Name
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Australian Earthquake Engineering Society (AEES) Conference 24-25 November 2022 Mt Macedon VIC
- Purpose
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Conference paper to be presented at the 2022 Australian Earthquake Engineering Society Conference "Women In Earthquake Engineering & Science Communication", November 23-25, Mt Macedon, Victoria.
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Resource provider Place and Communities Division
External Contact Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Clark, D.
Internal Contact
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
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Product data repository: Various Formats
- Website
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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
- Project
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Earthquake Activity
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- Project
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Community Safety
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- Keywords
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earthquake hazard
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- Keywords
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active fault
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- Keywords
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Adelaide
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- theme.ANZRC Fields of Research.rdf
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Structural geology and tectonics
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- Keywords
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Published_External
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Resource constraints
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Role Organisation / Individual Name Details User Any
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© Commonwealth of Australia (Geoscience) 2022
Resource constraints
- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Classification system
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Australian Government Security Classification System
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
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Link to Paper
Link to Paper
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pdf
- File decompression technique
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nil
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- OnLine resource
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Link to Conference Page
Link to Conference Page
- Distribution format
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Resource lineage
- Statement
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<div>Paper to be presented at the Australian Earthquake Engineering Society 2022 conference.</div>
Metadata constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/654661e7-c188-4a1c-95a0-1947a529530b
- Title
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GeoNetwork UUID
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- English
- Character encoding
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- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Clark, D.
Internal Contact
Type of resource
- Resource scope
- Document
- Name
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Journal Article / Conference Paper
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/147282
- Date info (Creation)
- 2022-11-08T03:51:07
- Date info (Revision)
- 2022-11-08T03:51:07
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551