Earthquake environmental effects produced by the Mw 6.1, 20th May 2016 Petermann earthquake, Australia

Earthquake Environmental Effects (EEEs) identified in the source region of the 20th May 2016 intraplate moment magnitude (Mw) 6.1 Petermann earthquake in Central Australia are described and classified using the Environmental Seismic Intensity (ESI-07) scale. EEEs include surface rupture, ground fissures and cracks, vegetation damage, rockfalls, and displaced (jumped) bedrock fragments. The maximum ESI intensity derived from EEEs is X, consistent with previous observations from some moderate Mw crustal earthquakes. Maximum ESI isoseismals correlate with the location of the surface rupture rather than epicentre area due to the dipping geometry of the reverse source fault. ESI isoseismals encompass a larger area of the hanging-wall than the footwall, indicating stronger ground motions on the hanging-wall due to increased proximity to the rupture source and ground motion amplification effects. The maximum areal extent of secondary (seismic shaking-induced) EEEs (300 km2) is significantly smaller than expected using the published ESI-07 scale (approx. 5000 km2). This relates to the low topographic relief and relatively homogeneous bedrock geology of the study region, which (i) reduced the potential for site response amplification of strong ground motions, and (ii) reduced the susceptibility of the landscape to EEE such as landsliding and liquefaction. Erosional degradation of the observed EEE features and decreasing confidence with which they can be uniquely attributed to a seismic origin with increasing time since the earthquake highlight challenges in using many of the natural features observed herein to characterise the locations and attributes of paleo-earthquakes.

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Date (Publication)
2018-11-01
Date (Revision)
2020-08-10T06:50:57
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/144168

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Codespace

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King, T.R.
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Quigley, M.C.
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Clark, D.J.
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Commonwealth of Australia (Geoscience Australia)

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Clark, D.J.
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theme.ANZRC Fields of Research.rdf

  • EARTH SCIENCES

  • GEOLOGY

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  • Earthquake hazard

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  • Intraplate earthquake

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  • Earthquake Environmental Effects

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  • Published_External

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4.0

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2018-11-01T00:00:00
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English
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Australian Government Security Classification System

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2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified

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urn:uuid/7577cecb-7a92-427a-b978-cd3ddbc7e811

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English
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Commonwealth of Australia (Geoscience Australia)

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Clark, D.J.

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External publication: Tectonophysics 747-748 357-372

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eCatId/144168

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/5167d912-6784-4371-9938-3931e84ca6f1

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Date info (Creation)
2019-04-08T01:55:29
Date info (Revision)
2019-04-08T01:55:29

Metadata standard

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AU/NZS ISO 19115-1:2014

Metadata standard

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ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

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

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Version 2.0, September 2018

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https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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Keywords

Earthquake Environmental Effects Earthquake hazard Intraplate earthquake
theme.ANZRC Fields of Research.rdf
EARTH SCIENCES GEOLOGY

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