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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. 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 Details
Item Type: | Refereed Article |
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Research Division: | Earth Sciences |
Research Group: | Physical geography and environmental geoscience |
Research Field: | Geomorphology and earth surface processes |
Objective Division: | Environmental Policy, Climate Change and Natural Hazards |
Objective Group: | Natural hazards |
Objective Field: | Natural hazards not elsewhere classified |
UTAS Author: | Kiernan, K (Dr Kevin Kiernan) |
ID Code: | 73117 |
Year Published: | 2011 |
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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