Product catalogue
The 2018 Lake Muir earthquakes: Australia’s ninth surface rupturing earthquake sequence in 50 years
A shallow MW 5.3 earthquake near Lake Muir in southwest Western Australia on the 16 September 2018 was followed on the 8 November by a co-located MW 5.2 event in the same region. Sentinel-1 synthetic aperture radar interferograms (InSAR) allowed for the timely identification and mapping of the surface deformation relating to both earthquakes. Field mapping, guided by the InSAR observations, revealed that the first event produced an approximately 3 km-long and up to 0.4 m-high west-facing surface rupture. Five seismic rapid deployment kits (RDKs) were installed in the epicentral region within three days of the 16 September event. These data, telemetered to Geoscience Australia’s National Earthquake Alerts Centre, have enabled the detection and location of more than 750 dependent events up to ML 4.6. Preliminary joint hypocentre relocation of aftershocks using data from RDKs confirms an easterly dipping rupture plane for the first MW 5.3 event.
The main shocks were recorded throughout the Australian National Seismic Network, in addition to a local broadband network in the Perth Basin operated by University of Texas at Dallas and the University of Western Australia. These data indicate large long-period ground-motions due to Rg phases and basin amplification. The two main shocks were widely felt within the region, including the Perth metro region (300 km away), with over 2400 online felt reports for the 8 November event.
The Lake Muir sequence represents the ninth recorded surface rupturing earthquake in Australia in the past 50 years. All of these events have occurred in the Precambrian cratonic terranes of western and central Australia, in unanticipated locations. Paleoseismic studies of these ruptures found no evidence for regular recurrence of large events on the underlying faults. The events might therefore be considered “one-offs” at timescales of significance to typical probabilistic seismic hazard studies.
Presented at 2019 Seismological Society of America Conference, Seattle in the special session on “Central and Eastern North America and Intraplate Regions Worldwide”
Simple
Identification info
- Date (Creation)
- 2019-01-08T00:00:00
- Date (Publication)
- 2024-03-20T05:19:37
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/126243
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Allen, T.
Place and Communities Internal Contact Author Clark, D.
Place and Communities Internal Contact Author Lawrie, S.
External Contact Author Brenn, G.
External Contact Author Dimech, J.
External Contact Author Garthwaite, M.
External Contact Author Glanville, H.
Place and Communities Internal Contact Author Kemp, T.
External Contact Author Lintvelt, C.
External Contact Author Lumley, D.
External Contact Author Pejic, T.
Place and Communities Internal Contact Author Saygin, E.
External Contact Author Standen, S.
External Contact
- Name
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Seismological Society of America Conference (SSA), 23-26 April 2019, Washington, USA
- Purpose
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Abstract for submission to the 2019 Seismological Society of America Conference
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Resource provider Place and Communities Division
External Contact Point of contact Allen, T.
Place and Communities Internal Contact
- 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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- Place
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Lake Muir
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- Theme
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earthquake
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- Theme
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seismic hazard
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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
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4.0
- Access constraints
- License
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© Commonwealth of Australia (Geoscience Australia) 2019
Resource constraints
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- Unclassified
- 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 facsimile
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Link to Conference Page
Link to Conference Page
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- OnLine resource
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Link to Abstract (page 161)
Link to Abstract (page 161)
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Resource lineage
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Abstract for submission to the 2019 Seismological Society of America Conference
- Hierarchy level
- Dataset
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Metadata
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urn:uuid/0d49a5b8-d908-4450-af8e-0afa05948e55
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GeoNetwork UUID
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Owner Allen, T.
Place and Communities Internal Contact Point of contact Allen, T.
Place and Communities Internal Contact
Type of resource
- Resource scope
- Document
- Name
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Conference Abstract
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
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- eCatId/126243
- Metadata linkage
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https://ecat.ga.gov.au/geonetwork/srv/eng//metadata/0d49a5b8-d908-4450-af8e-0afa05948e55
- Date info (Creation)
- 2019-01-10T04:05:32
- Date info (Revision)
- 2019-01-10T04:05:32
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
- Edition date
- 2015-07-01T00:00:00
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, April 2015