Authors / CoAuthors
Clark, D.J. | Leonard, M. | Griffin, J. | Stirling, M. | Volti, T.
Abstract
Unique challenges are faced in modelling faults in intraplate regions for seismic hazard purposes. Low fault slip rates compared to landscape modification rates lead to often poor discoverability of fault sources, and favours incomplete characterisation of rupture behaviours. Irrespective, regional and local test cases have demonstrated that fault sources assigned activity rates consistent with paleoseismic observations have the potential to significantly impact probabilistic seismic hazard assessments in Australia. To reflect this, the 2018 Australian NSHA will for the first time incorporate a fault source model. The model includes over 300 onshore faults, and a handful of offshore faults, which are modelled as simplified planes and assigned a general dip and dip direction. Dips are obtained from seismic-reflection profiles, where available, or inferred by taking into account surface geology and geomorphology, or other fault geometries within similar neotectonic settings. The base of faulting is generally taken as the regional maximum depth of distributed seismicity. Slip rates are calculated from displaced strata of known age, estimated from surface expression, or are extrapolated from other faults within similar neotectonic settings. We construct logic trees to capture epistemic uncertainty in fault source parameters, including magnitude frequency distribution, and the potential for random, periodic or episodic recurrence behaviour. This presentation introduces the new fault source database, the fault source logic tree as it currently exists, and discusses uncertainty in and sensitivity to various elements of the proposed fault source input model.
Product Type
product
eCat Id
100382
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
Keywords
- ( Sub-Topic Category )
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- earthquake
- ( Sub-Topic Category )
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- national seismic hazard assessment
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
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- Published_External
Publication Date
2020-08-11T00:16:45
Creation Date
2016-05-20T00:00:00
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Status
completed
Purpose
Australian Earthquake Engineering Society 2016 Conference Abstract
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
Abstract to be submitted to the Australian Earthquake Engineering society 2016 conference
Parent Information
Extents
[-90.00, 90.00, -180.00, 180.00]
Reference System
Spatial Resolution
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Associations
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