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.
Abstract presented at the 2017 Australian Earthquake Engineering Society (AEES) Conference
Simple
Identification info
- Date (Creation)
- 2017-09-01T00:00:00
- Date (Publication)
- 2024-03-19T22:36:02
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/116584
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Allen, T.
Place and Communities Internal Contact Author Griffin, J.
Place and Communities Internal Contact Author Clark, D.
Place and Communities Internal Contact Author Ghasemi, H.
Place and Communities Internal Contact Author Leonard, M.
External Contact Author Volti, T.
External Contact
- Issue identification
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2017 Australian Earthquake Engineering Society (AEES) Conference, 24-26 November 2017 Canberra ACT
- Purpose
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Abstract to be presented at the 2017 Australian Earthquake Engineering Society (AEES) Conference
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Resource provider Place and Communities Division
External Contact Point of contact Allen, T.
Place and Communities Internal Contact
- Topic category
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- Geoscientific information
Extent
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
- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- Keywords
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probabilistic seismic hazard analysis - PSHA
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- Keywords
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ground-motion models
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seismic hazard
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- Keywords
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earthquake magnitude
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- Keywords
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AS1170.4
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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
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4.0
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© Commonwealth of Australia (Geoscience Australia) 2017
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- 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 facsimile
- OnLine resource
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Link to Conference Page
Link to Conference Page
- Distribution format
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- OnLine resource
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Link to Abstract
Link to Abstract
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- Statement
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Abstract to be presented at the 2017 Australian Earthquake Engineering Society (AEES) Conference
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- Model
Metadata constraints
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/15c6f5e2-8f3f-4672-87e0-2e8806896c1d
- Title
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GeoNetwork UUID
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Owner Allen, T.
Place and Communities Internal Contact Point of contact Allen, T.
Place and Communities Internal Contact
Type of resource
- Resource scope
- Document
- Name
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Conference Abstract
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/116584
- Metadata linkage
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https://internal.ecat.ga.gov.au/geonetwork/srv/eng/search?uuid=15c6f5e2-8f3f-4672-87e0-2e8806896c1d
Point-of-truth metadata URL
- Date info (Creation)
- 2017-09-01T07:27:20
- Date info (Revision)
- 2018-03-01T04:10:54
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
- 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