eCite Digital Repository
The Lake Edgar Fault: an active fault in Southwestern Tasmania, Australia, with repeated displacement in the Quaternary
Citation
McCue, K and Van Dissen, R and Gibson, G and Jensen, V and Boreham, B, The Lake Edgar Fault: an active fault in Southwestern Tasmania, Australia, with repeated displacement in the Quaternary, Annals of Geophysics, 46, (5) pp. 1107-1117. ISSN 1593-5213 (2003) [Refereed Article]
Abstract
The Lake Edgar Fault in Western Tasmania, Australia is marked by a prominent fault scarp and is a recently reactivated fault initially of Cambrian age. The scarp has a northerly trend and passes through the western abutment of the Edgar Dam, a saddle dam on Lake Pedder. The active fault segment displaces geologically young river and glacial deposits. It is 29 ± 4 km long, and dips to the west. Movement on the fault has ruptured the ground surface at least twice within the Quaternary and possibly the last ca. 25 000 years; the most recent rupture has occurred since the last glaciation (within the last ca. 10000 years). This is the only known case of surface faulting in Australia with evidence for repeated ruptures in the Late Pleistocene. Along its central portion the two most recent surface-faulting earthquakes have resulted in about 2.5 m of vertical displacement each (western side up). The Lake Edgar Fault is considered capable of generating earthquakes in the order of magnitude 6 1/2-7 1/4. The Gell River Fault is another fault nearby that was apparently also active in the Late Pleistocene. It has yet to be studied in detail but the scarp appears to be more degraded and therefore older than the most recent movement on the Lake Edgar Fault.
Item Details
Item Type: | Refereed Article |
---|---|
Research Division: | Earth Sciences |
Research Group: | Geophysics |
Research Field: | Seismology and seismic exploration |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Jensen, V (Mr Vagn Jensen) |
ID Code: | 28142 |
Year Published: | 2003 |
Web of Science® Times Cited: | 3 |
Deposited By: | Earth Sciences |
Deposited On: | 2003-08-01 |
Last Modified: | 2004-03-16 |
Downloads: | 0 |
Repository Staff Only: item control page