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The 2023 National Seismic Hazard Assessment of Australia Rationale for changes in hazard

<div>Geoscience Australia, together with contributors from the wider Australian seismology community, have produced a new National Seismic Hazard Assessment (NSHA23), recommended for inclusion in proposed updates to Standards Australia’s&nbsp;AS1170.4. NSHA23 builds on the model framework developed for NSHA18, and incorporates scientific advances and stakeholder feedback received since development of that model. Key changes include: further refinement and homogenisation of the earthquake catalogue; revisions to the fault source model through inclusion of newly identified faults and revised activity rates on some faults; assessment of ground motion models through quantitative comparison against observations; and inclusion of a specific ground motion model for shaking from plate-boundary earthquakes in northern Australia. Expert elicitation was used to capture epistemic uncertainty surrounding model choices. The elicitation focused on decision points that sensitivity analysis had shown were more important for hazard, where new models had been developed, and where model choices had been controversial in NSHA18. Key questions included which catalogue to use as the basis for calculating hazard, the weighting of different source model classes (background, regional, seismotectonic, smoothed seismicity and smoothed seismicity with faults), and the selection and weighting of ground motion models for different tectonic regions. NSHA23 hazard results for capital cities show minor changes compared with NSHA18, with the exception of Darwin. Here the ground motion with a 10% probability of exceedance in 50 years increases significantly, a result that is attributed to inclusion of a new, more realistic ground motion model for plate-boundary earthquakes in this unique tectonic setting.</div><div><br>This paper was presented to the 2023 Australian Earthquake Engineering Conference 23-25 November 2023 ( https://aees.org.au/aees-conference-2023/)</div>

Simple

Identification info

Date (Creation)
2023-09-29
Date (Publication)
2023-12-18T06:54:39
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/148939

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Commonwealth of Australia (Geoscience Australia)

Voice
Author

Griffin, J.

Internal Contact
Author

Allen, T.

Internal Contact
Author

Clark, D.

Internal Contact
Author

Cummins, P.

Internal Contact
Author

Ghasemi, H.

Internal Contact
Author

Ebrahimi, R.

External Contact
Name

Australian Earthquake Engineering Conference 23-25 November 2023

Purpose

Conference paper on the National Seismic Hazard Assessment for the 2023 Australian Earthquake Engineering Conference

Status
Completed
Point of contact
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

Griffin, J.

Internal Contact
Spatial representation type
Topic category
  • Geoscientific information

Extent

N
S
E
W


Maintenance and update frequency
Not planned

Resource format

Title

Product data repository: Various Formats

Website

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
  • seismic hazard assessment

Keywords
  • ground motion model

Keywords
  • expert elicitation

theme.ANZRC Fields of Research.rdf
  • Natural Hazards

Keywords
  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

https://creativecommons.org/licenses/by/4.0/

Addressee
Role Organisation / Individual Name Details
User

Any

Use constraints
License
Use constraints
Other restrictions
Other constraints

© Commonwealth of Australia (Geoscience Australia) 2023

Resource constraints

Title

Australian Government Security Classification System

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Classification system

Australian Government Security Classification System

Associated resource

Association Type
Cross reference
Title

The 2023 National Seismic Hazard Assessment for Australia. Model Overview

Citation identifier
148969

Citation identifier
86d9ffcf-8bbf-4aad-b6c4-70fcae2be457

Website

http://pid.geoscience.gov.au/dataset/ga/148969

Link to eCat metadata record landing page

Associated resource

Association Type
Cross reference
Title

The 2023 National Seismic Hazard Assessment for Australia. Model Input and Output Data

Citation identifier
149177

Citation identifier
498d8c20-cb85-4558-956e-37aeb75c56a9

Website

http://pid.geoscience.gov.au/dataset/ga/149177

Link to eCat metadata record landing page

Associated resource

Association Type
Cross reference
Title

The 2023 National Seismic Hazard Assessment for Australia: notes on fault parametrisation for the Fault Source Model

Citation identifier
149143

Citation identifier
76fef341-dcb8-42c7-9691-ff73ced58fd4

Website

http://pid.geoscience.gov.au/dataset/ga/149143

Link to eCat metadata record landing page

Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

Voice facsimile
OnLine resource

Link to Conference Page

Link to Conference Page

Distribution format
OnLine resource

Link to Paper

Link to Paper

Distribution format

Resource lineage

Statement

<div>Final conference paper available online here: https://aees.org.au/wp-content/uploads/2023/11/8.-Jonathan-Griffin.pdf</div>

Metadata constraints

Title

Australian Government Security Classification System

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/59b94057-3b2f-4ca1-8724-8affeb351bf3

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice
Point of contact

Griffin, J.

Internal Contact

Type of resource

Resource scope
Document
Name

Journal Article / Conference Paper

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/148939

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/59b94057-3b2f-4ca1-8724-8affeb351bf3

Date info (Creation)
2023-12-18T06:44:28
Date info (Revision)
2023-12-18T06:44:28

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
http://pid.geoscience.gov.au/dataset/ga/122551

 
 

Spatial extent

N
S
E
W


Keywords

seismic hazard assessment
theme.ANZRC Fields of Research.rdf
Natural Hazards

Provided by

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