No abstract available

The Bureau of Mineral Resources, Geology and Geophysics (BMR) did a reconnaissance seismic survey in the central portion of the Bowen Basin in November, 1960. The objectives of the survey were to determine the structure of the Basin and the thickness of sediments by traversing from the western margin of the Basin near Anakie to the eastern margin east of Duaringa. Two other seismic surveys conducted in this Bowen Basin are Cooroorah Anticline seismic survey in 1959 (survey L037) and 254km seismic survey near the towns of Duaringa and Blackwater (survey L129).

Processed Stacked and Migrated SEG-Y seismic data and section images for the Youanmi Deep Crustal Seismic Survey. This survey was conducted under a National Geoscience Agreement with the Western Australia Geological Survey. Funding was through the Onshore Energy Security Program and Western Australia's Exploration Incentive Scheme. The objective of the survey was to image the northwest Yilgarn Craton to the Ida Fault crossing the Meekatharra structural zone, a focus of gold mineralization. Data are supplied as SEG-Y files, TIFF and PDF images. Raw data for this survey are available on request from clientservices@ga.gov.au

We report four lessons from experience gained in applying the multiple-mode spatially-averaged coherency method (MMSPAC) at 25 sites in Newcastle (NSW) for the purpose of establishing shear-wave velocity profiles as part of an earthquake hazard study. The MMSPAC technique is logistically viable for use in urban and suburban areas, both on grass sports fields and parks, and on footpaths and roads. A set of seven earthquake-type recording systems and team of three personnel is sufficient to survey three sites per day. The uncertainties of local noise sources from adjacent road traffic or from service pipes contribute to loss of low-frequency SPAC data in a way which is difficult to predict in survey design. Coherencies between individual pairs of sensors should be studied as a quality-control measure with a view to excluding noise-affected sensors prior to interpretation; useful data can still be obtained at a site where one sensor is excluded. The combined use of both SPAC data and HVSR data in inversion and interpretation is a requirement in order to make effective use of low frequency data (typically 0.5 to 2 Hz at these sites) and thus resolve shear-wave velocities in basement rock below 20 to 50 m of soft transported sediments.

We report four lessons from experience gained in applying the multiple-mode spatially-averaged coherency method (MMSPAC) at 25 sites in Newcastle (NSW) for the purpose of establishing shear-wave velocity profiles as part of an earthquake hazard study. The MMSPAC technique is logistically viable for use in urban and suburban areas, both on grass sports fields and parks, and on footpaths and roads. A set of seven earthquake-type recording systems and team of three personnel is sufficient to survey three sites per day. The uncertainties of local noise sources from adjacent road traffic or from service pipes contribute to loss of low-frequency SPAC data in a way which is difficult to predict in survey design. Coherencies between individual pairs of sensors should be studied as a quality-control measure with a view to excluding noise-affected sensors prior to interpretation; useful data can still be obtained at a site where one sensor is excluded. The combined use of both SPAC data and HVSR data in inversion and interpretation is a requirement in order to make effective use of low frequency data (typically 0.5 to 2 Hz at these sites) and thus resolve shear-wave velocities in basement rock below 20 to 50 m of soft transported sediments.

An optimal combination of geological, geomorphological and climatic properties, along with its high level of contemporary seismicity, makes the Archean craton in the SW corner of Australia an excellent natural laboratory for studying earthquake behaviour in stable continental regions (SCR). Analysis of the palaeo-seismic data derived from 35+ palaeo-earthquake scarps suggests that the long-term seismicity rate is a tenth of the contemporary rate. A 50 site regional GPS/Geodetic network was occupied over the 200 x 400 km study area in 2002 and 2006. Analysis of this data suggests that the long term tectonic strain-rate is about a one seventh (with an uncertainty range of half to a hundredth) of the rate derived from the seismicity recorded over the past 60 years. Re-occupation of this network in 2012 and reprocessing of the 2002 and 2006 data, using updated techniques, should reduce the uncertainty range. The difference between the contemporary seismicity and that suggested by the geological and geodetic data is strong evidence for an episodic (or non-stationary) model of seismicity in non-extended cratonic SCC. By contrast, the Mt Lofty/Flinders Ranges region in South Australia may be exhibiting stationary seismicity behaviour. The geologic structure of this region originally formed in an extensional setting in the Precambrian, and was reactivated in compression in the Cambrian (ca. 500 Ma.) and under the current the current stress field (since ~10-5 ma.). A 50 site GPS/Geodetic network was established in the Flinders ranges in 2003 and reoccupied in 2012. The strain-rate estimated from this data is expected to answer the key question of: Whether the geodetic strain-rate is consistent with the contemporary seismicity (and palaeo-seismicity) in this region or not. Consistency would suggest that the seismicity in this non-extended SCR is stationary, and should be described by a different seismo-tectonic model than the non-extended cratonic SCR

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No abstract available

The GEOPHYS_SURV database describes geophysical surveys (air, land, and marine), the datasets derived from those surveys, and the methods used for delivery of those datasets. The database includes metadata for all surveys conducted or managed by Geoscience Australia and its predecessor agencies, as well as data and surveys from State and Territory geological survey agencies.

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