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This preliminary report will provide a geochemical and ionic characterisation of groundwater, to determine baseline conditions and, if possible, to distinguish between different aquifers in the Laura basin. The groundwater quality data will be compared against the water quality guidelines for aquatic ecosystem protection, drinking water use, primary industries, use by industry, recreation and aesthetics, and cultural and spiritual values to assess the environmental values of groundwater and the treatment that may be required prior to reuse or discharge.
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Tsunami hazard assessments are often derived using a computational approach, with modelled tsunami generated for a suite of idealised uniform-slip earthquake scenarios. However, finite-fault inversions suggest real earthquakes have spatially non-uniform slip, and multiple studies have found this substantially affects tsunami, with nearshore wave heights and run-up varying by a factor of three or more as a result. Thus it seems desirable to account for non-uniform slip in computational tsunami hazard assessments. A natural approach to this is: 1) Suppose the hazard assessment consists of a suite of earthquake-tsunami scenarios with known location and magnitude, but unknown slip distribution. 2) For each earthquake scenario, generate a suite of spatially heterogeneous slip distributions using some synthetic finite-fault model; 3) Model the tsunami associated with each; 4) Assume that the variability in the modelled tsunami is a good representation of the expected variability in real tsunami, generated by an earthquake with the specified location and magnitude. Point 4) implies that real tsunami will generally fall ¿within the envelope¿ of a sufficiently large number of modelled tsunami with the same earthquake location and magnitude. This assumption requires careful justification, since there is much diversity among synthetic finite-fault models, and it is possible that biases in the latter may lead to large biases in the modelled tsunami, and thus in assessments of tsunami hazard. Therefore, in this study we investigate the extent to which some modelled uniform and stochastic slip earthquake-tsunami scenarios capture the variability of real tsunami, by comparison with a range of tsunami observations. The modelled scenarios form part of an updated tsunami hazard assessment for Australia, currently being developed at Geoscience Australia. A set of historic tsunami events is selected for which DART buoy wave height time-series and/or post-tsunami runup observations are available. For each historic event, a suite of uniform and stochastic slip earthquake-tsunami scenarios are generated. No event-specific calibration is applied to the models, except that they are constrained to have moment magnitude and spatial location ¿near¿ the corresponding global Centroid-Moment-Tensor catalogue values for the historic event. We discuss the extent to which modelled tsunami exhibit properties similar to real tsunami events, and implications for the use of synthetic finite fault models in tsunami hazard assessments
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(west) I50/B1-121
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22-2/D54-16/1-1 Contour interval: 2
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22-1/I53-3/3
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LITHO
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No abstract available
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22-1/I51-4/4
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22-1/I51-5/8