Authors / CoAuthors
Allen, T.
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
123370
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
Keywords
-
- HVC_144647
- ( Discipline )
-
- earthquake hazard
- ( Product )
-
- Published_External
Publication Date
2018-10-08T22:46:34
Creation Date
2018-10-05T00:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
This is the collection level record describes all components (reports and data) of the NSHA18 product.
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
www.ga.gov.au/nsha
Parent Information
Extents
[-44, -9, 112, 154]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
10% in 50 year seismic hazard map
Earthquake sources of the Australian plate margin: data for the 2018 national tsunami and earthquake hazard assessments
Expert elicitation of model parameters for the 2018 National Seismic Hazard Assessment - Summary of workshop, methodology and outcomes
Selection and ranking of ground-motion models for the 2018 National Seismic Hazard Assessment of Australia
The 2018 National Seismic Hazard Assessment for Australia – earthquake epicentre catalogue
Earthquake sources of the Australian plate margin: Revised models for the 2018 national tsunami and earthquake hazard assessments
The 2018 National Seismic Hazard Assessment for Australia – Data
The 2018 National Seismic Hazard Assessment for Australia – Data package, maps and grid values
The 2018 National Seismic Hazard Assessment: Model overview
The 2018 National Seismic Hazard Assessment for Australia – model input files
Source Information