Authors / CoAuthors
Leonard, M. | Clark, D.
Abstract
The southwest corner of Western Australia consists of Protozoic geology with the area undergoing no tectonic activity in the last 40Ma. It has not been glaciated in the last 20Ma and has had a cool dry climate for at least 200ka, thus providing an ideal environment to preserve fault scarps. High resolution DEM data has been used to identify over 50 new features that are thought to be scarps of surface rupturing earthquakes. Half of these scarps have been the subject of some field work with one new feature being fully verified. Using recently developed fault scaling relations the fault length and displacement are used to estimate the magnitude and, in many cases, identifying multiple events. This has been used to generate a neotectonic earthquake catalogue. Non-extended stable continental region (SCR) and extended continental crust (ECC) and have separate catalogues The SCR catalogue is considered to have a magnitude of completeness (Mc) of M6.5 with ~55 earthquakes of M6.5 or greater. The data has typical truncated GR recurrence characteristics, with a slope (b) of 0.9-1.0, between magnitude 6.5 and 6.9, and rapid decrease in recurrence above M6.9. SCR data has an asymptote of M7.2 suggesting a Mmax of M7.1-M7.3. The ECC data has a Mc of M7.2 and has 15 events of this magnitude or greater. The recurrence rapidly decreases above M7.4 with an asymptote of M7.6 suggesting a Mmax of M7.5-M7.7. The large number of SCR events gives us confidence in the proposed Mmax of M7.2.
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nonGeographicDataset
eCat Id
68526
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- External PublicationConference Paper
- ( Theme )
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- earthquakes
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2009-01-01T00:00:00
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