A card to illustrate the GA Education Centre, and the activities it can provide to school groups.

Same content as 2017A SEAPEX Promotional USB, with an updated Acreage Release Map.

In probabilistic seismic hazard modelling the choice of whether faults behave with Characteristic or Gutenberg-Richter recurrence statistics has a high impact on the hazard level. Compared to a model that does not include fault sources, the addition of a high slip rate (by intraplate standards) Characteristic fault results in a modest increase in hazard for a 500 years return period event, and a modest increase at longer return periods (i.e. ~2500 years). A Gutenberg-Richter fault with the same slip rate will result in a comparatively higher hazard at 500 years, similar hazard at 2500 years and a lower hazard a very long return periods (i.e. ~5000 years). Results from interplate and active intraplate paleoseismological investigations since the mid-1980s have been used to suggest that earthquakes recurrent on a given fault often have the same characteristic rupture length and amount of slip (i.e. a Characteristic Rupture Model). Stable asperities and barriers, which survive many earthquakes, are proposed to explain these results. The scarcity of data precludes definitive validation of the model in Australian Stable Continental Region crust. However, preliminary indications are that the Characteristic Rupture Model has some merit in cratonic regions of the country while faults in non-cratonic regions may behave in a more complex fashion.

Analysis of the distribution patterns of Pb isotope data from mineralised samples using the plumbotectonic model of Carr et al. (1995), which invokes mixing between crustal and mantle reservoirs, indicates systematic spatial patterns that reflect major metallogenic and tectonic boundaries in the Lachlan and Delamerian orogens in New South Wales and Victoria. This distribution pattern accurately maps the boundary between the Central and Eastern Lachlan. The Central Lachlan is characterised by Pb isotope characteristics with a strong crustal signature, whereas the Eastern Lachlan is characterised by variable crustal and mantle signatures. The Macquarie Arc is dominated by Pb with a mantle signature: known porphyry Cu-Au and high sulphidation epithermal Au-Cu deposits in the arc are associated with a zone characterised by the strongest mantle signatures. In contrast, granite-related Sn deposits in the Central Lachlan are characterised by the strongest crustal signatures. The Pb isotope patterns are broadly similar to Nd isotope model age patterns derived from felsic magmatic rocks, although a lower density of Nd isotope analyses makes direct comparison problematic. The two reservoirs identified by Carr et al. (1995) do not appear to be isotopically linked: the crustal source was not formed via extraction from the mantle source. Rather, the two reservoirs must have formed separately. The mantle reservoir may have been sourced from a subducting proto-Pacific plate, whereas the crustal reservoir is most likely to be extended Australian crust. The data allow the possibility that the proto-Pacific mantle source was isotopically linked to the western Tasmanian crustal source. Comparison of Pb isotope data from the Girilambone district (e.g., Tritton and Avoca Tank deposits) with those from the Cobar district in north central New South Wales indicates a less radiogenic signature, and probably older age, for deposits in the Girilambone district. Hence, a syngenetic volcanic-associated massive sulphide origin for these deposits is preferred over a syn-tectonic origin. The data are also consistent with formation of the Girilambone district in a back-arc basin inboard from the earliest phase of the Macquarie Arc.

InaSAFE is free and open source software for developing realistic disaster impact scenarios for better disaster planning and response. Originally developed in Indonesia, it is now being used in many countries around the world to inform disaster management decision making with a strong scientific evidence base. Designed to be simple to use, InaSAFE can rapidly output the estimated impacts of a hazard event on a given exposure dataset and translate this information into a series of questions targeting particular disaster management actions. This supports disaster managers to make better decisions about the resources that they may need to respond to a disaster event. This presentation will demonstrate case studies of InaSAFE use for a range of hazards (earthquake, tsunami, volcanic ash and fire) for locations in Australia and the region. This will demonstrate InaSAFE's capability and its applicability to a diverse range of disaster management problems.

Storymap showing the top 68 images shortlisted by judges in the 2015 TopGeoShot competition.

Extensive historical (anecdotal) information covering the past 3 decades indicated that the remote and pristine Nadgee lake estuary in southern NSW had a benthic dominated ecology. All descriptions indicated that it had oligotrophic waters with dense cover of benthic macropyhtes and associated avifauna. When we arrived at Nadgee in late 2008 for the first scientific aquatic survey (ever) it looked nothing like this. The lake was dominated by an intense microalgal bloom and no macrophytes were present. Why? Entrance opening and closure are the major disturbances in an intermittent estuary like Nadgee, but there are no records of past entrance behaviour for such a remote site. This paper describes the use of Geoscience Australia's recent compilation and rectification of Landsat images (the Australian Geoscience Data Cube), along with the application of a consistent water detection tool for all pixels in that compilation, to determine opening and closing regimes. The output of the analyses provides an indication of whether a pixel was wet or dry (or not able to be determined) for all images over the entire 27 year's worth of data. Water level records measured by OEH since 2009 were used to ground-truth the remote sensed data. We can now determine when, over the past 27 years, the Lake opened and how long the water level remained low. This information, along with an understanding of the ecology of the primary macrophytes has been used to provide some possible models that explain when and why the fundamental shift from benthic to pelagic may have occurred.

Diagram produced for the Department of Industry and Science to depict those areas of water adjacent to SA that fall under the OPGGS Act, Petroeum (Seas and Submerged Lands) Act 1982 (SA) and Petroleum and Geothermal Energy Act 2000 (SA).

Tsunamis are infrequent events with the power to cause massive loss of life, large economic losses, and cascading effects such as destruction of critical facilities. The recurrence of the truly disastrous events may range from hundreds to even thousands of years. To manage these events, scientists turn to hazard and risk analysis. This typically involves a quantification of the temporal probability of a tsunami run-up height at a coastal location or region, often involving long recurrence, labelled the hazard analysis. Correspondingly the risk analysis concerns probability of damage and loss, using the hazard analysis as the basis. We here present the first fully probabilistic global tsunami hazard and risk analysis, by using large earthquakes as sources. Unlike more frequent hazards as for instance floods and cyclones, tsunami risk analysis cannot make use of historical records. The hazard analysis is rather based on the Probabilistic Tsunami Hazard Assessment (PTHA) method, which employs earthquake sources to quantify the probability of tsunami run-up and inundation height at coastal locations. Based on the PTHA, a probabilistic risk analysis quantifying the probability of direct building damage losses is conducted for all tsunami prone countries worldwide. Being a global analysis comprising the most relevant tsunami sources and probabilities, the study provides an overview of the global tsunami risk state-of-affairs on the national scale. Originally developed for broad interdisciplinary multi-risk studies comparing various natural hazards on the national and regional scale, the methods and results presented here are however not suitable for detailed local studies of the tsunami hazard and risk.

This report describes the deep reflection seismic data acquisition and processing for the easter part of the Eucla-Gawler seismic line L203 13GA-EG1.