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

Citation

Clark, D and Cupper, M and Sandiford, M and Kiernan, K, Style and timing of late Quaternary faulting on the Lake Edgar fault, south west Tasmania, Australia: Implications for hazard assessment in intracratonic areas, Geological Society of America Special Papers, 2011, (479) pp. 109-131. ISSN 0072-1077 (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 Geological Society of America

Official URL: http://specialpapers.gsapubs.org/content/479/109.a...

DOI: doi:10.1130/2011.2479(05)

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. 4861 ka. A similar amount of vertical displacement during each faulting event suggests that surface-breaking earthquakes on this fault are characteristically of magnitude MW 6.87.0. 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 Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Geomorphology and Regolith and Landscape Evolution
Objective Division:Environment
Objective Group:Natural Hazards
Objective Field:Natural Hazards not elsewhere classified
Author:Kiernan, K (Dr Kevin Kiernan)
ID Code:73117
Year Published:2011
Web of Science® Times Cited:4
Deposited By:Geography and Environmental Studies
Deposited On:2011-09-14
Last Modified:2012-04-30
Downloads:1 View Download Statistics

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