Landslides in the Sydney Basin - Geoscience Australia

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Seismic Hazard in SydneyProceedings of the one day workshopMcElroy, C.T., and Relph, R.E. 1958. Explanatory notes to accompany geological maps of the innercatchment, Warragamba storage. Department of Mines, Geological Survey of NSW, Sydney.Mills, J.M., and Fitch, T.J. 1977. Thrust faulting and crust - upper mantle structure in East Australia.Geophysical Journal of the Royal Astronomical Society 48: 351-384.MWSDB 1974. Seismological investigations. Burragorang earthquake and aftershocks. Map andreport. Metropolitan Water Sewerage and Drainage Board, Sydney.Pells, P.J.N., Braybrooke, J.C., Mong, J., and Kotze, G.P. 1987. Cliff line collapse associated withmining activities. in Walker, B.F., and Fell, R., eds., Soil Slope Instability and StabilisationBalkema, Rotterdam, 359-385.Reynolds, R.G. 1976. Coal mining under stored water: report on an inquiry into coal mining underor in the vicinity of the stored waters of the Nepean, Avon, Cordeaux, Cataract and WoronoraReservoirs, New South Wales, Australia. Department of Public Works, Sydney.Rib, H.T., and Liang, T. 1978. Recognition and identification. In Landslides Analysis and Control,Schuster, R.L., and Krizek, R.J., (eds). National Academy of Sciences, Washington; 34-80.Sinadinovski, C., McCue, K., and Somerville, M. 2000. Characteristics of strong ground motion fortypical Australian intra-plate earthquakes and their relationship with the recommendedresponse spectra. Soil Dynamics and Earthquake Engineering 20: 101-110.Taylor, G.M. 2005. Landslides around Lake Burragorang: their characteristics, distribution andimpact potential. [Unpublished Honours thesis] Macquarie University, Sydney.Tomkins, K.M., Humphreys, G.S., Skeen, H.J., Taylor, G.M., Farwig, V.J., Shakesby, R.A., Doerr,S.H., Wallbrink, P., Blake, W.H., and Chafer, C.J. 2004b. Deciphering a colluvial mantle:Nattai catchment. SuperSoil 2004: Program and Abstracts for the 3rd Australian and NewZealand Soils Conference. University of Sydney, Australia,www.regional.org.au/au/asssi/supersoil2004.van der Beek, P., Pulford, A., and Braun, J. 2001. Cenozoic landscape development in the BlueMountains (SE Australia): Lithological and tectonic controls on rifted margin morphology.The Journal of Geology 109: 35-56.Walker, P.H. 1963. Soil history and debris-avalanche deposits along the Illawarra scarpland.Australian Journal of Soil Research 1 (1): 223-230.Wellman, P., and McDougall, I. 1974. Potassium-argon ages on the Cainozoic volcanic rocks ofNew South Wales. Journal of the Geological Society of Australia 21 (3): 247-272.Young, A.R.M. 1977. The characteristics and origin of coarse debris deposits near Wollongong,N.S.W., Australia. Catena 4: 289-307.107
Seismic Hazard in SydneyProceedings of the one day workshopAPPENDIX 1. CALCULATION OF LANDSLIDE RETURN INTERVALSThe return intervals of the Tumbledown and Carne Landslides were estimated using the volume ofthe incised section of the Nattai valley as an indicator of erosion over time by landsliding. In doingso, we are assuming that landslides are the dominant erosional process leading to valley wideningonce a knickpoint has passed, and other processes such as slope wash have a negligible effect onerosion rates. The volume of the incised Nattai valley was determined by GIS (ArcMap, ArcHydro)using a 25 m digital elevation model, clipped to the top of the cliff line. The timeframe of valleyerosion is indicated by Oligocene and Miocene basalts (Wellman and McDougall, 1974; van derBeek et al., 2001) situated on the plateau in the Nattai and Grose River valleys which show thatvalley incision post-dates their extrusion.Tumbledown LandslideVolume of Tumbledown Landslide 1.5 M m 3 = 0.0015 km 3Volume of the incised Nattai valley 21.3 km 3No. of landslides of this size required to erode the incised Nattai 14,200valleyTimeframe of erosion14 – 34 MaEstimated return period of 1.5 M m 3 landslide1,000 – 2,500 yearsCarne LandslideVolume of Carne Landslide 30 M m 3 or 0.03 km 3Volume of the incised Nattai valley 21.3 km 3No. of landslides of this size required to erode the incised Nattai 710valleyTimeframe of erosion14 – 34 MaEstimated return period of 30 M m 3 landslide20,000 – 50,000 years108
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Landslides in the Sydney Basin - Geoscience Australia

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