Product catalogue
Sensitivity of Probabilistic Tsunami Hazard Assessment to Far-Field Earthquake Slip Complexity and Rigidity Depth-Dependence: Case Study of Australia
Probabilistic Tsunami Hazard Assessment (PTHA) often proceeds by constructing a suite of hypothetical earthquake scenarios, and modelling their tsunamis and occurrence-rates. Both tsunami and occurrence-rate models are affected by the representation of earthquake slip and rigidity, but the overall importance of these factors for far-field PTHA is unclear. We study the sensitivity of an Australia-wide PTHA to six different far-field earthquake scenario representations, including two rigidity models (constant and depth-varying) combined with three slip models: fixed-area-uniform-slip (with rupture area deterministically related to magnitude); variable-area-uniform-slip; and spatially heterogeneous-slip. Earthquake-tsunami scenarios are tested by comparison with DART-buoy tsunami observations, demonstrating biases in some slip models. Scenario occurrence-rates are modelled using Bayesian techniques to account for uncertainties in seismic coupling, maximum-magnitudes and Gutenberg-Richter b-values. The approach maintains reasonable consistency with the historical earthquake record and spatially variable plate convergence rates for all slip/rigidity model combinations, and facilitates partial correction of model-specific biases (identified via DART-buoy testing). The modelled magnitude exceedance-rates are tested by comparison with rates derived from long-term historical and paleoseismic data and alternative moment-conservation techniques, demonstrating the robustness of our approach. The tsunami hazard offshore of Australia is found to be insensitive to the choice of rigidity model, but significantly affected by the choice of slip model. The fixed-area-uniform-slip model produces lower hazard than the other slip models. Bias adjustment of the variable-area-uniform-slip model produces a strong preference for `compact' scenarios, which compensates for a lack of slip heterogeneity. Thus, both heterogeneous-slip and variable-area-uniform-slip models induce similar far-field tsunami hazard.
Simple
Identification info
- Date (Creation)
- 2019-04-11
- Date (Publication)
- 2019-08-13T04:24:17
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/128193
- Cited responsible party
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Role Organisation / Individual Name Details Author Davies, G.
Author Griffin, J.
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Davies, G.
Resource provider Positioning and Community Safety Division
- Spatial representation type
- Topic category
-
- 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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- Theme
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tsunami
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- Theme
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hazard assessment
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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
-
4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Associated resource
- Association Type
- Cross reference
- Title
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The 2018 Australian Probabilistic Tsunami Hazard Assessment
- Citation identifier
- 122789
- Citation identifier
- fd1533d2-b176-45b1-9d40-5936aaef7d6f
Associated resource
- Association Type
- Was informed by
- Title
-
The 2018 Australian Probabilistic Tsunami Hazard Assessment
- Citation identifier
- 122789
- Citation identifier
- fd1533d2-b176-45b1-9d40-5936aaef7d6f
Associated resource
- Association Type
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- Title
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PTHA18 source-code repository and data access scripts
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- Citation identifier
- 1da13c50-0815-334e-e053-12a3070abfaa
Associated resource
- Association Type
- Was generated by
- Title
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2018 Australian Probabilistic Tsunami Hazard Assessment Results
- Citation identifier
- 122796
- Citation identifier
- 11af3b85-b6b2-4e77-9e89-a18041d8b083
Associated resource
- Association Type
- Cross reference
- Title
-
Tsunami variability from uncalibrated stochastic earthquake models: Tests against deep ocean observations 2006-2016
- Citation identifier
- 124287
- Citation identifier
- 096dfc11-dfcf-4e98-9137-ce68403bb6ce
Associated resource
- Association Type
- Was informed by
- Title
-
Tsunami variability from uncalibrated stochastic earthquake models: Tests against deep ocean observations 2006-2016
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- 124287
- Citation identifier
- 096dfc11-dfcf-4e98-9137-ce68403bb6ce
- 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
Link to article
- Distribution format
-
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html
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Resource lineage
- Statement
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Not supplied
Metadata constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
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urn:uuid/cd9bb5d4-30ae-430b-bb45-630fdaf3708e
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GeoNetwork UUID
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- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Davies, G.
Type of resource
- Resource scope
- Document
- Name
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GA publication: External publication
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/128193
- Date info (Creation)
- 2019-04-08T01:55:29
- Date info (Revision)
- 2019-04-08T01:55:29
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
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551