Authors / CoAuthors
Clark, D.J. | Dentith, M. | Wyrwoll, K.H. | Yanchou, L. | Featherstone, W.
Abstract
We present new paleoseismicity data for the 30 km long and 2.5 m high Hyden fault scarp in Western Australia, which, when combined with the results of previous research, provides the most extensive record of surface rupturing earthquakes yet assembled for an "active" Australian intracratonic fault. The data indicate that four to five surface rupturing earthquakes have occurred on the Hyden Fault during the Quaternary (E1: ca. 20 ka, E2: ca. 50-55 ka, E3: ca. 90-100 ka, and two events E4 and E5, >200 ka). Activity is episodic, with single seismic cycle slip rates varying from 0.03 mm/yr to less than 0.01 mm/yr. Palaeo-earthquake magnitudes are estimated to have been in the order of M 6.8. The identification of a similar fault scarp immediately northwest of the Hyden scarp, and of two air-photo lineaments to the west of the Hyden scarp, indicates that strain is distributed amongst a family of faults in this region. The presence of multiple nearby active faults suggests that the recurrence of severe ground shaking in the Hyden region is more frequent than indicated by the palaeoseismic data presented here.
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nonGeographicDataset
eCat Id
65026
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- External Publication
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- earthquakes
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- geohazards
- ( Theme )
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- structural geology
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- AU-WA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2006-12-05T00:00:00
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