From 1 - 10 / 735
  • Australia is an island continenet extending from tropical to midlatitude waters with an Exclusive Economic Zone of some 8.6 million square kilometres. Its regional seas are exposed to climatological conditions ranging from the westerly Roaring Forties winds in the south, to monsoon and tropical cyclone conditions in the north. It also encompasses regions of extreme biodiversity, with 80 percent of southern temperate species endemic to the region. The focus of marine research in Australia is becoming more interdisciplinary in response to factors such as the national government's recent Oceans Policy, which emphasises sustainable development and ecological based management. However, historically there have been relatevely few major interdisciplinary studies in Australian waters.

  • Geoscience Australia, ACRES distribute Landsat Multispectral Scanner (MSS), Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) data for a series of epochs or time frames covering Australia. The first epoch is 1972. These data have been produced and provided by the Australian Greenhouse Office (AGO). AGO use the data in their National Carbon Accounting System for monitoring land clearing and revegetation. This data is only available through ACRES and ACRES Landsat Distributors, and not through the AGO. More information is available at <a href="http://www.ga.gov.au/acres/prod_ser/agosuite.jsp">http://www.ga.gov.au/acres/prod_ser/agosuite.jsp</a> This data is available in 1:1M tiles or as a full continental Mosaic. Tiles areas are available at: <a href="http://www.ga.gov.au/acres/prod_ser/agotilemap.jsp">http://www.ga.gov.au/acres/prod_ser/agotilemap.jsp</a>

  • This dataset maps the geomorphic habitat environments (facies) for 140 Queensland coastal waterways. The classification system contains 12 easily identifiable and representative environments: Barrier/back-barrier, Bedrock, Central Basin, Channel, Coral, Flood- and Ebb-tide Delta, Fluvial (bay-head) Delta, Intertidal Flats, Mangrove, Rocky Reef, Saltmarsh/Saltflat, Tidal Sand Banks (and Unassigned). These types represent habitats found across all coastal systems in Australia. Most of the 140 coastal waterways have a "Near Pristine" environmental condition (as opposed to "Modified"). Southern and central Great Barrier Reef lagoon coasts have a broad spectrum of river, tide and wave- dominated estuaries.

  • Records of abstracts from the Annual Geoscience Exploration Seminar (AGES) 2004

  • Geomorphic mapping of the ~30 km Lake Edgar fault scarp in SW Tasmania suggests that three large surface-rupturing events with vertical displacements of 2.4 - 3.1 m have occurred in late Quaternary times. Optically stimulated luminescence (OSL) chronology from a sequence of three periglacial fluvial terraces associated with scarp incision provides constraint on the age of these events. The ages of alluvial/colluvial fans derived from the youngest fluvial terraces constrain the most recent event to ca 17 - 18 ka. The chronology of the two preceding events is more poorly constrained. The near coincidence of ages from the base of the youngest terrace and the penultimate terrace suggest that penultimate faulting might have occurred during active fluvial deposition ca 25 - 28 ka. The oldest recognised event occurred subsequent to the ca 61 ka deposition of gravels on the highest of the three terraces and prior to the deposition of ca 48 ka gravels exposed in the footwall fan. The vertical displacement implies earthquake magnitudes in the order of MW 6.8 - 7.0. Estimates for the average slip rate calculated for the two complete seismic cycles range from 0.17 - 0.20 mm/yr (unweighted mean). This sequence represents the first recurrence data for surface-rupturing earthquakes on an eastern Australian Quaternary fault. The Lake Edgar Fault, which originally formed in the Palaeozoic, is undoubtedly susceptible to reactivation under conditions imposed by the contemporary Australian intraplate stress field. While displaying episodic rupture behaviour, the fault appears to rupture with a "characteristic" magnitude. These findings are significant for seismic hazard assessment both in Australia and in intracratonic areas worldwide.

  • This dataset contains point, line and polygon data of the marine environment surrounding the Cocos (Keeling) Islands. It includes coastlines, bathymetric contours, coral outcrops and other features. Coverage extends to the whole of Cocos Keeling Isalnds. The themes have been grouped so as to increase the ease of use of the data. The individual themes have been grouped into the following shapefiles: Infralin.shp - Infrastructure lines Boundlin.shp - Boundary lines Marinelin.shp - Marine lines Surveylin.shp - Survey lines Islandlin.shp - Island outlines Marineply.shp - Marine polygon Islandply.shp - Island polygon Boundply.shp - Boundary polygon These shapefiles retain all spatial and non spatial data as supplied to GA. To view the sample of the marine environment with the legend click here. In December 2003 GA projected the data to UTM (WGS84) zone 47 using Arcview.

  • Several Quaternary fault scarps have been mapped in Australia during routine geological mapping. One of the most prominent scarps relates to the Lake Edgar Fault in southwest Tasmania. The 30km long north-south trending scarp occurs within the boundary of the Southwest National Park. The scarp traverses the button grass of the Huon Plains and is notable because faulting resulted in the defeat of westerly flowing drainage and the consequent formation of the fault-bound sag pond of Lake Edgar.

  • PRINSAS is a Windows program that takes as input, raw small angle neutron and X-ray scattering data obtained from various world-wide facilities, displays the raw curves on interactive log-log plots, and allows processing of the raw curves. Separate raw SANS and USANS curves can be combined into complete scattering curves for an individual sample. The combined curves can be interpreted, and information inferred about sample structure, using built-in functions. These include obtaining the fractal dimension, the distribution of scatterer size, the specific surface area of scatterers and the porosity (when the scatterers are pores) assuming spherical scatterers. A utility for calculating scattering length density from the component oxides is included in the program.

  • Product no longer exists, please refer to GeoCat #30413 for the data

  • Product no longer exists, please refer to GeoCat #30413 for the data