During 1969, the Mundaring Geophysical Observatory collected seismic refraction data from explosions used by the Bureau of Mineral Resources No. 2 seismic party in the southwest of Western Australia. The seismic party exploded 37 charges up to 4,500 kilograms on a traverse from Balladonia through Kalgoorlie to Perth. Two mobile Willmore seismographs and permanent seismographs at Mundaring and Kalgoorlie recorded the resultant seismic waves. Raw data for this survey are available on request from clientservices@ga.gov.au - Quote eCat# 76503

In the severi months from the beginning of May to the end of November 1966, the Bureau of Mineral Resources carried out a seismic survey on the Flinders Regional Gravity Low in north-central Queensland. The first six months of the survey were spent in investigating the sedimentary section between Richmond and Julia Creek, particularly to determine whether there was any appreciable thickness of Palaeozoic sediments. The seismic results proved that basement was reasonably shallow and that no appreciable thickness or Palaeozoic sediments can be expected in the area. One month of the survey was then devoted to seismic work near Bowen Downs Homestead, north of Aramac, in an effort to determine the location of the western margin of the Drummond Basin. This work demonstrated that sediments of the Drummond Basin increase in thickness rapidly to the east in the area surveyed.

Geoscience Australia acquired the Canning Coastal Deep Crustal Seismic Survey in 2014. The survey involved the acquisition of seismic reflection and gravity data along two traverses, 14GA-CC1 (562km) and 14GA-CC2 (143km) between Port Hedland and Derby, WA. The purpose of the survey was to image the crustal architecture of the geology underlying the Canning Basin and its relationship to the boundaries between the crystalline hard rock areas of the North (Kimberley) and West Australian (Pilbara) cratons. As well as establishing the subsurface extent of the Canning Basin and the extent and nature of its sub-basins and troughs. The project was collaboration between the Geological Survey of Western Australia and Geoscience Australia with funding from the Western Australian Royalty for Regions Scheme. Raw data for this survey are available on request from clientservices@ga.gov.au

Despite long history of studies the Wallaby Plateau offshore Western Australia remains a controversial feature. Analysis of interval seismic velocities from Geoscience Australia's 2008/09 seismic survey 310 in conjunction with seismic reflection interpretation provides new insights into the geology of the Plateau. Seismically distinctive divergent dipping reflector sequences (DDRS) have been identified. The seismic character of the DDRS is similar to seaward dipping reflector sequences (SDRS) of inferred volcanic composition. Initial analysis of seismic velocity profiles indicated affinities between the DDRS packages and known sedimentary strata in the Houtman Sub-basin. Effect of water loading on seismic velocities is commonly ignored in offshore studies. However, direct comparative analysis of interval velocity patterns between areas of significantly different water depth requires various water pressure related changes in velocity to be accounted for. There are controversies in methodology and application of water depth adjustment to seismic velocities, and presentation of velocity models as function of pressure rather than two-way time, or depth emerges as a possible solution. Water depth adjustment of seismic velocities analysed in our study reduces distinction between SDRS, DDRS and sedimentary strata such that discrimination between volcanic and sedimentary strata in DDRS or SDRS is equivocal. A major uncertainty of this interpretation is due to a lack of the reference velocity model of SDRS and DDRS investigated globally.

A seismic reconnaissance, traverse was surveyed for 20 miles along an east-west line,. 10 miles 'north of -Carnarvon, as part of a regional investigation of the southern part of the Carnarvon Basin, W.A. Both reflection and refraction techniques were used, and the results were Correlated, where possible, with the known formations in the Pelican Hill bore. Several reflecting horizons could be followed although reflections from below the level of the Cretaceous/Palaeozoic unconformity were badly interfered by multiples. The refraction method was successful, and recorded three main refractors with velocities of 14750.ft/sec, 18400 ft/sec, and 20,280 ft/sec. The main feature of the section obtained is a broad antiform within the Palaeozoic sediments, shown particularly by the 20 2 280 ft/sec refractor, which is_a good marker. for structural mapping. This marker has been tentatively correlated with the Dirk Hartog Dolomite, which would suggest that the strata underlying the Gneudna Formation in the Pelican Hill bore belong to the Nanyarra Greywacke rather than the Tumblagooda Sandstone. Overall the profile of the 20 2 280 ft/sec marker has a slight west dip from about 4000 feet at the eastern end to about 5000 feet at the western end of the traverse. The Cretaceous/Palaeozoic unconformity was fairly flat at a depth of about 1500 feet. Indications from the reflection cross-section and from the profile of the 18,400.ft/sec refractor are that the sediments between the two above horizons are similar in structural attitude to the deeper horizon.

The seismic reflection survey was undertaken by the Bureau of Mineral Resources on top of gravity and magnetic surveys in the Gippsland Lakes district, Victoria. The aim of the seismic survey is to convience the favourable structure to the accumulation of oil being present on the overlying Tertiary rocks. Two north-south traverses and one running east-west and crossing the other two were surveyed.

In November 1964, the Bureau of Mineral Resources Seismic Party No. 1 carried out a velocity survey in CBMR 12 (Cockroach) Well, Northern Territory, which had been drilled to 4000 feet and logged using sonic and other logging methods. The time/depth values obtained in the velocity survey were in good agreement with those obtained by integration of the sonic log. A curve showing the variation with time-of'the coefficient of reflection calculated from the sonic log showed an outstanding feature, which appeared to correlate with the best reflection recorded on an experimental seismic traverse nearby. According to the geological interpretation of the well log, this reflection arises from velocity changes near the boundary of the ArrinthrungaTormation and the Marqua Beds at a depth of 2,721 feet.

<p>2D seismic reflection data were acquired in the South Gippsland region of Victoria in June-July 2015. The project was a collaboration between the Geological Survey of Victoria (GSV) and Geoscience Australia (GA). The purpose of the survey was to gain an understanding of the geometry and internal structure of the Cretaceous Strzelecki Group and the underlying Palaeozoic basement of the Melbourne Zone. <p>Two hundred and three km of deep crustal reflection data were collected for the South Gippsland seismic survey along four transects 15GA-SG1, 15GA-SG2, 15GA-SG3 and 15GA-SG4. The data processing is being undertaken by a contractor on behalf of GA and GSV and is expected to be released in March 2016. <p>Raw data are available on request from clientservices@ga.gov.au

An experimental seismic survey was conducted at Haddon Downs, South Australia, during Octobor and November.1957. The area lies within the Eromanga Sub-basin of the Great Artesian Basin, and at least 5,500 feet of Mesozoic section are known to exist there, part of which is of a marine facies. Preliminary reconnaissance work by geologists of Santos Ltd. which holds an Oil Prospecting Licence over the area, revealed some large anticlines on the surface. The Company has already completed a limited amount of gravity work which gives promise of supplying useful information on both regional and detailed subsurface structure. Two important refractors were recorded which may be useful for semi-regional mapping. A refractor of velocity 10,250 ft/sec. was recorded from a depth of about 2,700 feet, and this may represent the top of the marine Cretaceous section. The second refractor of velocity 17,000 ft/sec. and aidoroximate depth 7,250 feet may be just below the base of the Mesozoic section. Large multiple geophone arrays and pattern shots were needed to obtain good quality reflections over most of the area, except when shooting on the alluvial plains of the larger creeks. The sedimentary section was shown to be at least 8,000 feet and possibly 16,000 feet thick, The base of the Mesozoic section is interpreted as being 7,250 feet deep on the refraction traverse and 8,600 feet at the south-east end of the reflecta.on traverse. The rest of the section probably consists of Palaeozoic sediments. If so, the high velocity (17,000 ft/sec.) suggests that a dense elastic or crystalline limestone is probably present near the top of them. The structure of the Mesozoic section is subhorizontal, but there may be minor structures with dips less than 1 degree which correlate with the surface structures.

Geoscience Australia acquired the Boulia Region Deep Crustal Seismic Survey in two stages during 2014 and 2015. The survey involved the acquisition of seismic reflection and gravity data along three traverses, 14GA-CF2 (369km), 14GA-CF3 (339km) and 15GA-CF3 (140km). Traverse CF3 was carried out over two campaigns with a 6km overlap between the two lines. The purpose of the survey was to establish the architecture of the southern Mount Isa Inlier as well as determining the depth of sediment cover over the Proterozoic basement. The project was collaboration between the Geological Survey of Queensland and Geoscience Australia with funding from the Queensland Governments Future Resources (Mount Isa Geophysics) Program. <b>Raw data for this survey are available on request from clientservices@ga.gov.au</b>