d5fc3740-993b-4b12-9f07-f66c947946ed urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T06:32:25 creation ISO 19115 2016 Time-depth functions for the Great Australian Bight Basins d5fc3740-993b-4b12-9f07-f66c947946ed The seismic stacking velocity data in the Great Australian Bight are a useful dataset for calculating depths and sediment thicknesses. This work presents time-depth relationships computed from an unfiltered stacking velocity database and compares these with depths from sonobuoy P-wave velocities and exploration well sonic logs. The comparison suggests that a total sediment thickness over-estimate for the Ceduna Sub-basin of about 15% can be expected from the depths derived from stacking velocities. On the other hand, for sediment thickness calculations down to ~4 s two-way travel time below sea floor, stacking velocity data give comparable depths to those obtained from the wells' sonic logs. A piece-wise formula is offered which scales the time-depth function for the Ceduna Sub-basin in order to compensate for the depth overestimate inherent in using stacking velocities to calculate total sediment thickness. Megasequence boundary depths are calculated for the Ceduna Terrace to further illustrate data quality. {"type": "Polygon", "coordinates": [[[125.0, -37.0], [135.0, -37.0], [135.0, -31.0], [125.0, -31.0], [125.0, -37.0]]]} 125.0 135.0 -37.0 -31.0 Earth Sciences GA Publication Published_External Record geoscience databases sedimentary basins seismics Download the Record (pdf) documentDigital Download the Record (pdf) PDF Unnamed resource documentDigital HTML