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A long-range, controlled source seismic profile in northern Australia |
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| Authors: | A L Hales J M W Rynn |
| Institution: | Research School of Earth Sciences, Australian National University, Canberra, Australia |
| Abstract: | Summary. A two-ship refraction profile was fired on the Australian continental shelf during the Banda Sea geophysical programme carried out by the Woods Hole Oceanographic Institution, the Scripps Institution of Oceanography and the Geological Survey of Indonesia. Some of the 55-kg shots fired during this profile were observed at an array of stations in northern Australia to a distance of 1150 km. The first arrival P travel times at the land stations had apparent velocities of 6.52, 8.24 and 8.48 km/s. The observed travel times correspond closely with those for other stable continental platform or shield regions. The travel times in these regions are of the order of 6 s less than those given in the Jeffreys—Bullen tables at distances of 700 to 1150 km. The observations are interpreted as implying an upper-mantle velocity of 8.4 km/s at a depth of about 75 km. |
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