Legacy product - no abstract available

A bullentin outlining the seismicity and earthquake risk in Eastern Australia. The topics covered include:The Structure of the Crust and Upper Mantle Beneath Southeastern Australia. Seismic Risk in New South Wales. Geological Appreciation of the Seismicity of the Southern Portion of the Sydney Basin . The Picton Earthquake of 9 March 1973: A Seismic View of the Source. Effects of the 1973 Picton and Other Earthquakes in Eastern Australia Appendix 1: Claim Details Provided by the Fire and Underwriters Association of New South Wales. Some Structural Damage Caused by the 1973 Picton Earthquake. Seismotectonics of South Australia and Earthquake Trends. The Eden Fault and Its Effect on the Development of Adelaide. Progress Report on Seismic Zoning in Australia. Dynamic Response of Black Mountain Tower to Estimated Ground Motions. Seismic Considerations Affecting the Safety of Nuclear Plant. The Role of Local Geology in Seismic Intensity Predictions. Seismic Effects on Nuclear Power Plants The Effect of Large Dams on Earthquake Risk.

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For over a decade Geoscience Australia has adopted a practice of releasing the processed seismic reflection data, together with an initial interpretation, as soon as possible after the completion of data acquisition. This policy reflects recognition that new data and ideas are a valuable resource for both researchers and the exploration industry, and that seismic data often provides new and quantitative insights into the structure of the crust at depth. This data and interpretation release is normally done in a workshop that is open to all comers, and with an understanding that not all ideas are fully developed. The Curnamona Project is a collaborative project between PIRSA Minerals and Energy Resources, Geoscience Australia and the predictive mineral discovery Cooperative Research Centre (pmd*CRC) using the seismic acquisition facilities of the Australian National Seismic Imaging Resource (ANSIR). The aim of the Curnamona survey was to provide information on the crustal architecture of the southern Curnamona Province in both the highly prospective Palaeo- and Mesoproterozoic rocks and the overlying Neoproterozoic and Cambrian sequences. A particular objective was the imaging of the deeper crust and major structural features that may have influenced hydrothermal fluid flow and hence mineralisation. The Curnamona seismic workshop is the first public display and discussion of data and results of the Curnamona seismic survey commenced in 2003 and completed in 2004 after being washed out by floods. Feedback on the seismic results back to GA and PIRSA project staff at this workshop is as valuable as the information flow to the workshop attendees, because it helps flesh out the geological understanding that is emerging from the seismic data. Usually a quantity of seismic data, such as presented at this workshop, takes time to analyse and develop ideas as well as test hypotheses. At a detailed level, we have to continue to examine what the seismic data tells us about the minerals systems that operated within the Curnamona Province and how this knowledge may be used in minerals exploration. The complexity of the work requires collaboration and does not just rely on the expertise of seismic interpreters. Data processing, sequence stratigraphy, structural geology, tectonics, minerals systems, geochronology, and local and regional geology must all be taken into account. The seismic results show us a crustal architecture for the Curnamona Province of eastern South Australia that provides important information on basement architecture that will enhance investment and targeting strategies for mineral explorers in the province. One example is the observation that the Kalkaroo prospect appears to be related to second order faults associated with hanging wall anticlines above a major bounding east-dipping fault at depth, opens up the possibility for further mineral deposits associated with other hanging wall anticlines above east-dipping faults.

Legacy product - no abstract available

Geoscience Australia acquired seismic survey GA 310, in 2008-2009, across the southwest margin of Australia, as part of the Australian Government's Energy Security Program. Deep reflection seismic and potential field data were recorded across sparse 2D grids, located over the Wallaby Plateau in the north, Mentelle Basin in the south and the intervening Houtman and Zeewyck sub-basins of the northern Perth Basin. The offshore northern Perth Basin extends for some 700 km along the Western Australia margin, from the towns of Carnarvon in the north to Cervantes in the south. The largely Paleozoic-Mesozoic tectonostratigraphic framework is dominated by Permian and Early-Middle Jurassic rifting, followed by Late Jurassic-Early Cretaceous rifting leading to Valanginian breakup between Australia and Greater India. Underlying Precambrian Pinjarra Orogen structuring, in conjunction with rifting, has resulted in the development of several complex depocentres and basement highs. A recent re-evaluation of the offshore northern Perth Basin well-based lithostratigraphy into a new chronostratigraphic sequence framework has been carried outboard, over the GA 310 seismic lines, into the margin bounding Zeewyck and northern Houtman sub-basins. The main sequences hosting source rocks - Kockatea and Cattamarra - are widely present in the expansive northern Houtman Sub-basin, and are likely present in the deep Zeewyck Sub-basin. The mapping of a thick Late Jurassic Yarragadee Sequence within the Zeewyck Sub-basin indicates a major pre-breakup locus of relatively rapid deposition. The structural interpretation across the sub-basin highlights breakup-drift unconformities, strike-slip faulting and suggests a probable along-margin sheared crustal sliver - tectonic elements commensurate with an evolving rift-shear breakup margin.

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available