The application of synthetic seismograms to the interpretation of the upper mantle P-wave velocity structure in northern Australia

Details The application of synthetic seismograms to the interpretation of the upper mantle P-wave velocity structure in northern Australia The application of synthetic seismograms to the interpretation of the upper mantle P-wave velocity structure in northern Australia

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...38....9l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 38, Issue 1, p. 9-27.

Physics

34

Scientific paper

During the period 1974 to 1977, a long range seismic refraction project was conducted in Central Australia, along a profile extending south from Darwin. Earthquakes from the Banda Sea region were used as seismic sources for this experiment. An analysis by Hales and co-workers of the resulting data based on travel times, and using geometric raytracing techniques, has resulted in the construction of an upper mantle velocity model. Using synthetic seismograms to model amplitudes, it is shown that additional constraints can be placed on the derived velocity profile. The low velocity zone beneath the ``200 km'' discontinuity is found to have a more abrupt onset than was previously suggested. A smaller discontinuity at 325 km depth is now implied. The analysis suggests that the ``400 km'' discontinuity is a first order velocity increase, whereas all other observed upper mantle discontinuities are more satisfactorily modelled as second order type structures.
Current address: Bureau of Mineral Resources, P.O. Box 378, Canberra 2601, Australia.

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