Landslides in the Sydney Basin - Geoscience Australia
Landslides in the Sydney Basin - Geoscience Australia
Landslides in the Sydney Basin - Geoscience Australia
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Seismic Hazard <strong>in</strong> <strong>Sydney</strong>Proceed<strong>in</strong>gs of <strong>the</strong> one day workshopSou<strong>the</strong>rn Coalfield dataThe Sou<strong>the</strong>rn Coalfield encompasses <strong>the</strong> sou<strong>the</strong>rn section of <strong>the</strong> <strong>Sydney</strong> Bas<strong>in</strong> south of Botany Bay.Fault data <strong>in</strong> this region were derived from coalm<strong>in</strong>e plans on <strong>the</strong> top of <strong>the</strong> Bulli Seam and are twodimensional(e.g. Figure 3). These data are used pr<strong>in</strong>cipally to calculate moment release for <strong>the</strong> faultpopulation sampled so that moment rate can be partitioned between strike-slip and dip-slipstructures. The faults <strong>in</strong> <strong>the</strong> Sou<strong>the</strong>rn Coalfield are predom<strong>in</strong>antly normal <strong>in</strong> <strong>the</strong>ir sense of slip anddisplace late Permian Illawarra coal measures. Fault<strong>in</strong>g is to a large extent late Cretaceous and earlyTertiary <strong>in</strong> age, represent<strong>in</strong>g <strong>the</strong> western marg<strong>in</strong> of rift<strong>in</strong>g associated with Tasman Sea open<strong>in</strong>g from80-55 Myr agoFigure 3 Map of faults on <strong>the</strong> Bulli Seam <strong>in</strong> <strong>the</strong> coastal zone of <strong>the</strong> Sou<strong>the</strong>rn Coalfield.Strike-slip faults are marked <strong>in</strong> red and dip-slip faults <strong>in</strong> dark blue. The blue rectangleoutl<strong>in</strong>es <strong>the</strong> 25 km by 10 km study area.64
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