Studies of earthquake source characterization are often undertaken using the back-projection technique and large, dense seismic arrays. Combinations of such arrays have also been utilised in an attempt to increase the spatial resolution of the source energy distribution patterns. However our tests show that the use of few well selected seismic stations can produce comparable results to those obtained by the processing of large seismic arrays. Employing dense arrays of seismic stations may increase the signal to noise ratio, but this is not the reason behind apparent improvements in resolution of radiated energy patterns. In practice, resolution of the source energy radiation pattern relies on the same principles as those which underline earthquake hypocentre location. Back-projection techniques applied to large Mw > 7 subduction earthquakes shows that starting with small numbers of spatially separated seismic stations the correct distribution of radiated energy can be estimated. The set of spatially separated seismic stations can be selected by the same criteria as those used for accurate hypocentral location to map radiated seismic energy not only in a plane but in 3D as well. Application of this algorithm to a number of deep (>100km) earthquakes, such as the Mw 8.2 Sea of Okhotsk event, shows the further potential of the back-projection technique.

To follow

New display for the foyer for Open Day 2015. Highlights 9 mineral specimens from Broken Hill and includes background on the Broken Hill mines.

To follow

A test item

Back wall poster display in the library celebrating Library and Information Week 2014

Joining Geoscience Australia's Graduate Program is an exciting opportunity to learn about the diverse earth science disciplines work for the nation's leading government geoscience research and information agency. Posters and Flyers.

A series of display panels highlighting the 2004 Indian Ocean Tsunami event; the response to the threat of tsunami by the Australian Government including the development of the Australian Tsunami Warning System; and how this system, now fully implemented, contributes to the safety of the community.

Descriptive posters

As part of the National CO2 Infrastructure Plan, Geoscience Australia is undertaking a three year project to provide a detailed assessment of the Vlaming Sub-basin prospectivity for the geological storage of CO2. An important part of this assessment is an evaluation of the seal quality and integrity, including analysis of fault reactivation, signs of seepage, as well as lithological variability within the seal. Over a large area the Gage reservoir is underlain by the Charlotte reservoir (Figure 1). Based on well data, the two reservoirs are at least partially connected. Due to limited data, the Charlotte reservoir was not considered by the previous studies for additional storage capacity. Even if Charlotte Sandstone is not considered for storage, it presents a base seal issue for CO2 storage in the Gage reservoir, which needs to be addressed. The current study mapped the Charlotte reservoir and analysed its potential impact on the containment of CO2. Initial results of this study are outlined below.