Product catalogue
Towards an updated national seismic assessment for Australia
Geoscience Australia has produced a draft National Seismic Hazard Assessment (NSHA18),
together with contributions from the wider Australian seismology community. This paper provides
an overview of the provisional peak ground acceleration (PGA) hazard values and discusses
rationale for changes in the proposed design values at the 1/500-year annual exceedance probability (AEP) level relative to Standards Australia’s AS1170.4–2007 design maps. The NSHA18 update yields many important advances on its predecessors, including: consistent expression of earthquake magnitudes in moment magnitude; inclusion of epistemic uncertainty through the use of third-party source models; inclusion of a national fault-source model; inclusion of epistemic uncertainty on fault-slip-model magnitude-frequency distributions and earthquake clustering; and the use of modern ground-motion models through a weighted logic tree framework.
In general, the 1/500-year AEP seismic hazard values across Australia have decreased relative to
the earthquake hazard factors the AS1170.4–2007, in most localities significantly. The key reasons for the decrease in seismic hazard factors are due to: the reduction in the rates of moderate-to-large earthquakes through revision of earthquake magnitudes; the increase in b-values through the conversion of local magnitudes to moment magnitudes, particularly in eastern Australia, and; the use of modern ground-motion attenuation models.
Whilst the seismic hazard is generally lower than in the present standard, we observe that the
relative proportion of the Australian landmass exceeding given PGA thresholds is consistent with
other national hazard models for stable continental regions.
Simple
Identification info
- Date (Creation)
- 2018-03-01T12:00:00
- Date (Publication)
- 2020-09-22T02:20:46
- Citation identifier
- ga-dataSetURI/Link to be added by administrator
- Cited responsible party
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Role Organisation / Individual Name Details Author Allen, T.I.
- Purpose
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Extended abstract for the Australian Earthquake Engineering Society 2017 Conference
- Status
- Completed
- Spatial representation type
- Topic category
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- Geoscientific information
Extent
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
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Administration to complete
- Edition
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Administration to complete
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
- Theme
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seismic hazard
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- Keywords
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AS1170.4
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- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Classification
- Unclassified
- 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
- OnLine resource
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Link to article (pdf)
Link to article (pdf)
- Distribution format
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pdf
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Resource lineage
- Statement
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Extended abstract for Australian Earthquake Engineering Society 2017 Conference, Nov 24-26, Canberra, ACT
- Hierarchy level
- Document
Metadata constraints
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/37152199-9101-4438-8537-9bfaace11dc9
- Title
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GeoNetwork UUID
Type of resource
- Resource scope
- Document
- Name
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External publication
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/135795
- Metadata linkage
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https://internal.ecat.ga.gov.au/geonetwork/srv/eng/search?uuid=37152199-9101-4438-8537-9bfaace11dc9
Point-of-truth metadata URL
- Date info (Creation)
- 2018-03-01T04:29:01
- Date info (Revision)
- 2018-03-01T04:45:00
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 (Draft Schemas 2015)
- Edition date
- 2015-07-01T00:00:00
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, April 2015