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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:	Refereed Article
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
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