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Style and timing of late Quaternary faulting on the Lake Edgar fault, southwest Tasmania, Australia: Implications for hazard assessment in intracratonic areas

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Clark, D and Cupper, M and Sandiford, M and Kiernan, K (2011) Style and timing of late Quaternary faulting on the Lake Edgar fault, southwest Tasmania, Australia: Implications for hazard assessment in intracratonic areas. The Geological Society of America Special Papers, 2011 (Specia). pp. 109-131. ISSN 0072-1077

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Abstract

Geomorphic analysis of the ~30-km-long Lake Edgar fault scarp in southwestern Tasmania suggests that three large surface-rupturing events with vertical displacements of 2.4 m to 3.1 m have occurred in late Quaternary time. Optically stimulated luminescence (OSL) age estimates from a sequence of three periglacial fluvial terraces associated with faulting constrain these events to ca. 18 ka, ca. 28 ka, and ca. 48–61 ka. A similar amount of vertical displacement during each faulting event suggests that surface-breaking earthquakes on this fault are characteristically of magnitude MW 6.8–7.0. Estimates for the average slip rate calculated over two complete seismic cycles range from 0.11 to 0.24 mm/yr, which is large for a stable continental region fault. This sequence represents the first recurrence data for surface-rupturing earthquakes on an eastern Australian Quaternary fault, and one of only a few for the entire Australian continent.

Item Type: Article
Journal or Publication Title: The Geological Society of America Special Papers
Page Range: pp. 109-131
ISSN: 0072-1077
Identification Number - DOI: 10.1130/9780813724799
Additional Information: Copyright © 2011 Geological Society of America
Date Deposited: 15 Sep 2011 02:17
Last Modified: 18 Nov 2014 04:22
URI: http://eprints.utas.edu.au/id/eprint/11820
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