Authors / CoAuthors
Allen, T. | Griffin, J. | Leonard, M. | Clark, D. | Ghasemi, H.
Abstract
Geoscience Australia, together with contributors from the wider Australian seismology community, has produced a National Seismic Hazard Assessment (NSHA18) that is intended as an update to the 2012 National Seismic Hazard Maps (NSHM12; Burbidge, 2012; Leonard et al., 2013). This Geoscience Australia Record provides an overview of the development of the NSHA18. Time-independent, mean seismic design values are calculated on Standards Australia’s AS1170.4 Soil Class Be (at VS30=760 m/s) for the horizontal peak ground acceleration (PGA) and for the geometric mean of the spectral accelerations, Sa(T), for T = 0.1, 0.2, 0.3, 0.5, 1.0, 2.0 and 4.0 s over a 15-km national grid spacing. Hazard curves and uniform hazard spectra are also calculated for key localities. Maps of PGA, in addition to Sa(0.2 s) and Sa(1.0 s) and for a 10% probability of exceedance in 50 years (Figure A). Additional maps and seismic hazard products are provided in a separate Geoscience Australia Record (Allen, 2018). The NSHA18 update yields many important advances over its predecessors, including: - the calculation in a full probabilistic framework (Cornell, 1968) using the Global Earthquake Model Foundation’s OpenQuake-engine (Pagani et al., 2014); - the consistent expression of earthquake magnitudes in terms of moment magnitude, MW; - inclusion of a national fault-source model based on the Australian Neotectonic Features database (Clark et al., 2016); - the inclusion of epistemic (i.e. modelling) uncertainty: - through the use of multiple alternative source models; - on magnitude-recurrence distributions; - fault recurrence and clustering models; - on maximum earthquake magnitudes for both fault and area sources through an expert elicitation workshop; and - the use of modern ground-motion models, capturing the epistemic uncertainty on ground motion through an expert elicitation workshop.
Product Type
document
eCat Id
123020
Contact for the resource
Point of contact
Resource provider
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Digital Object Identifier
Keywords
- ( Discipline )
-
- earthquake hazard
-
- Published_External
-
- HVC_144647
Publication Date
2019-01-31T05:07:21
Creation Date
2018-09-18T00:00:00
Security Constraints
Legal Constraints
Status
final
Purpose
This Record is the first in the series of Records and datasets that support the release of the NSHA18
Maintenance Information
periodic
Topic Category
geoscientificInformation
Series Information
Record 2018/027
Lineage
Geoscience Australia develops the National Seismic Hazard Assessment (NSHA) for Australia. The NSHA defines the level of earthquake ground shaking across Australia that has a given likelihood of being exceeded in a given time period. Knowing how the ground-shaking hazard varies across Australia allows higher hazard areas to be identified and prioritised for the development of mitigation strategies so communities can be more resilient to earthquake events. The NSHA also provides key information to the Australian Government Building Codes Board, so buildings and infrastructure design standards can be updated to ensure they can withstand earthquake events in Australia. Geoscience Australia schedules the update to the NSHA with the update to the earthquake loading standard, so the committee can consider any changes to the seismic hazard risk of Australia, and whether the code needs to be amended to reflect this. The 2018 update was scheduled to inform the 2017 revision of the earthquake loading standard. Promotion of project via http://www.ga.gov.au/about/projects/safety/nsha
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Extents
[-44, -9, 112, 154]
Reference System
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Service Information
Associations
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Expert elicitation of model parameters for the 2018 National Seismic Hazard Assessment - Summary of workshop, methodology and outcomes
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Expert elicitation of model parameters for the 2018 National Seismic Hazard Assessment - Summary of workshop, methodology and outcomes
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Selection and ranking of ground-motion models for the 2018 National Seismic Hazard Assessment of Australia: Summary of ground-motion data, methodology and outcomes
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Selection and ranking of ground-motion models for the 2018 National Seismic Hazard Assessment of Australia: Summary of ground-motion data, methodology and outcomes
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The 2018 National Seismic Hazard Assessment for Australia: Earthquake Epicentre Catalogue
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The 2018 National Seismic Hazard Assessment for Australia: Earthquake Epicentre Catalogue
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Earthquake sources of the Australian plate margin: Revised models for the 2018 national tsunami and earthquake hazard assessments
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GG-Cat: earthquake epicentre catalogue
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Earthquake sources of the Australian plate margin: data for the 2018 national tsunami and earthquake hazard assessments
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The 2018 national seismic hazard assessment of Australia: Quantifying hazard changes and model uncertainties
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Seismic Hazard Assessment in Australia: Can Structured Expert Elicitation Achieve Consensus in the “Land of the Fair Go”?
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