- ISSN: 2202-0586
- E-ISSN:
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oa Coherence between teleseismic tomography and long-wavelength features 0f the gravity and magnetic fields of Southeastern Australia
- Australian Society of Exploration Geophysicists
- Source: ASEG Extended Abstracts, Volume 2009, Issue ASEG2009 - 20th Geophysical Conference, Dec 2009, p. 1 - 6
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- 01 Dec 2009
Abstract
During 2007 the NSW Department of Primary Industries contracted the Australian National Research Facility for Earth Sounding (ANSIR) to conduct the SEAL2 (South East Australia Linkage experiment, part 2) teleseismic program in southwestern New South Wales, to supplement earlier teleseismic acquisition in Victoria and southeastern South Australia (Figure 1). Interpretation of the results of the earlier SEAL1 program (Rawlinson et al., 2006), acquired with a seismic array in the southern Murray basin, appeared to conflict with recent interpretations of upper-crustal tectonic trends inferred primarily from aeromagnetic surveys in southwestern NSW (Hallett et al., 2005), which suggested that the Stawell Zone of western Victoria continued northwards into NSW. Instead, the SEAL1 tomographic model suggested a break in upper mantle velocities near the state border; the model implied that the Stawell Zone in Victoria is underlain by high vp upper mantle, consistent with lithospheric basement of Proterozoic age, while the putative extension of the Stawell Zone into NSW is underlain by low vp mantle, corresponding to Palaeozoic basement.
